Release 0.9.1

Remove usize and isize from data model

.travis.yml

@@ -1,8 +1,7 @@
 sudo: false
 language: rust
 rust:
-- 1.10.0
+- 1.13.0
-- 1.11.0
 - stable
 - beta
 - nightly
@@ -11,7 +10,7 @@ before_script:
 - export PATH=$HOME/.local/bin:$PATH
 script:
 - (cd serde && travis-cargo build)
-- (cd serde && travis-cargo --skip nightly test)
+- (cd serde && travis-cargo --only beta test)
 - (cd serde && travis-cargo --only nightly test -- --features unstable-testing)
 - (cd serde && travis-cargo build -- --no-default-features)
 - (cd serde && travis-cargo --only nightly build -- --no-default-features --features alloc)
@@ -19,8 +18,9 @@ script:
 - (cd testing && travis-cargo --skip nightly test)
 - (cd testing && travis-cargo --only nightly test -- --features unstable-testing)
 - (cd serde_derive && travis-cargo --only nightly test)
-- (cd examples/serde-syntex-example && travis-cargo --skip nightly run)
+- (cd serde_derive/no-std-tests && travis-cargo --only nightly build)
-- (cd examples/serde-syntex-example && travis-cargo --only nightly run -- --no-default-features --features unstable)
+#- (cd examples/serde-syntex-example && travis-cargo --skip nightly run)
+#- (cd examples/serde-syntex-example && travis-cargo --only nightly run -- --no-default-features --features unstable)
 - (cd serde && travis-cargo --only stable doc)
 env:
   global:

LICENSE

@@ -1,33 +0,0 @@
-See LICENSE-APACHE and LICENSE-MIT.
-
-----
-
-bench_log is derived from https://github.com/cloudflare/goser, which has the
-following license:
-
-Copyright (c) 2013, CloudFlare, Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-* Redistributions of source code must retain the above copyright
-  notice, this list of conditions and the following disclaimer.
-* Redistributions in binary form must reproduce the above copyright
-  notice, this list of conditions and the following disclaimer in the
-  documentation and/or other materials provided with the distribution.
-* Neither the name of the author nor the
-  names of its contributors may be used to endorse or promote products
-  derived from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
-ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
-DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
-LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
-ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-

README.md

@@ -11,12 +11,11 @@ You may be looking for:
 - [Setting up `#[derive(Serialize, Deserialize)]`](https://serde.rs/codegen.html)
 - [Examples](https://serde.rs/examples.html)
 - [API documentation](https://docs.serde.rs/serde/)
+- [Release notes](https://github.com/serde-rs/serde/releases)
 
 ## Serde in action
 
 ```rust
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 
@@ -50,8 +49,9 @@ fn main() {
 Serde developers live in the #serde channel on
 [`irc.mozilla.org`](https://wiki.mozilla.org/IRC). The #rust channel is also a
 good resource with generally faster response time but less specific knowledge
-about Serde. If IRC is not your thing, we are happy to respond to [GitHub
+about Serde. If IRC is not your thing or you don't get a good response, we are
-issues](https://github.com/serde-rs/serde/issues/new) as well.
+happy to respond to [GitHub issues](https://github.com/serde-rs/serde/issues/new)
+as well.
 
 ## License
 

examples/serde-syntex-example/Cargo.toml

@@ -3,6 +3,7 @@ name = "serde-syntex-example"
 version = "0.1.0"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 build = "build.rs"
+publish = false
 
 [features]
 default = ["serde_codegen"]

examples/serde-syntex-example/src/main.rs

@@ -1,5 +1,3 @@
-#![cfg_attr(feature = "serde_derive", feature(proc_macro))]
-
 #[cfg(feature = "serde_derive")]
 #[macro_use]
 extern crate serde_derive;

serde/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde"
-version = "0.8.16"
+version = "0.9.1"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"
@@ -9,8 +9,12 @@ repository = "https://github.com/serde-rs/serde"
 documentation = "https://docs.serde.rs/serde/"
 readme = "../README.md"
 keywords = ["serde", "serialization"]
+categories = ["encoding"]
 include = ["Cargo.toml", "src/**/*.rs"]
 
+[badges]
+travis-ci = { repository = "serde-rs/serde" }
+
 [features]
 default = ["std"]
 
@@ -21,4 +25,7 @@ collections = ["alloc"]
 unstable-testing = ["clippy", "unstable", "std"]
 
 [dependencies]
-clippy = { version = "^0.*", optional = true }
+clippy = { version = "0.*", optional = true }
+
+[dev-dependencies]
+serde_derive = "0.9"

serde/src/bytes.rs

@@ -1,4 +1,20 @@
-//! Helper module to enable serializing bytes more efficiently
+//! Wrapper types to enable optimized handling of `&[u8]` and `Vec<u8>`.
+//!
+//! Without specialization, Rust forces us to treat `&[u8]` just like any other
+//! slice and `Vec<u8>` just like any other vector. In reality this particular
+//! slice and vector can often be serialized and deserialized in a more
+//! efficient, compact representation in many formats.
+//!
+//! When working with such a format, you can opt into specialized handling of
+//! `&[u8]` by wrapping it in `bytes::Bytes` and `Vec<u8>` by wrapping it in
+//! `bytes::ByteBuf`.
+//!
+//! Rust support for specialization is being tracked in
+//! [rust-lang/rust#31844][specialization]. Once it lands in the stable compiler
+//! we will be deprecating these wrapper types in favor of optimizing `&[u8]`
+//! and `Vec<u8>` out of the box.
+//!
+//! [specialization]: https://github.com/rust-lang/rust/issues/31844
 
 use core::{ops, fmt, char, iter, slice};
 use core::fmt::Write;
@@ -6,14 +22,36 @@ use core::fmt::Write;
 use ser;
 
 #[cfg(any(feature = "std", feature = "collections"))]
-pub use self::bytebuf::{ByteBuf, ByteBufVisitor};
+pub use self::bytebuf::ByteBuf;
+
+#[cfg(any(feature = "std", feature = "collections"))]
+#[doc(hidden)] // does anybody need this?
+pub use self::bytebuf::ByteBufVisitor;
 
 #[cfg(feature = "collections")]
 use collections::Vec;
 
 ///////////////////////////////////////////////////////////////////////////////
 
-/// `Bytes` wraps a `&[u8]` in order to serialize into a byte array.
+/// Wraps a `&[u8]` in order to serialize in an efficient way. Does not support
+/// deserialization.
+///
+/// ```rust
+/// # #[macro_use] extern crate serde_derive;
+/// # extern crate serde;
+/// # use std::net::IpAddr;
+/// #
+/// use serde::bytes::Bytes;
+///
+/// # #[allow(dead_code)]
+/// #[derive(Serialize)]
+/// struct Packet<'a> {
+///     destination: IpAddr,
+///     payload: Bytes<'a>,
+/// }
+/// #
+/// # fn main() {}
+/// ```
 #[derive(Clone, Copy, Eq, Hash, PartialEq, PartialOrd, Ord)]
 pub struct Bytes<'a> {
     bytes: &'a [u8],
@@ -65,7 +103,7 @@ impl<'a> ops::Deref for Bytes<'a> {
 
 impl<'a> ser::Serialize for Bytes<'a> {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: ser::Serializer
     {
         serializer.serialize_bytes(self.bytes)
@@ -84,9 +122,27 @@ mod bytebuf {
     use de;
 
     #[cfg(feature = "collections")]
-    use collections::Vec;
+    use collections::{String, Vec};
 
-    /// `ByteBuf` wraps a `Vec<u8>` and serializes as a byte array.
+    /// Wraps a `Vec<u8>` in order to serialize and deserialize in an efficient
+    /// way.
+    ///
+    /// ```rust
+    /// # #[macro_use] extern crate serde_derive;
+    /// # extern crate serde;
+    /// # use std::net::IpAddr;
+    /// #
+    /// use serde::bytes::ByteBuf;
+    ///
+    /// # #[allow(dead_code)]
+    /// #[derive(Serialize, Deserialize)]
+    /// struct Packet {
+    ///     destination: IpAddr,
+    ///     payload: ByteBuf,
+    /// }
+    /// #
+    /// # fn main() {}
+    /// ```
     #[derive(Clone, Default, Eq, Hash, PartialEq, PartialOrd, Ord)]
     pub struct ByteBuf {
         bytes: Vec<u8>,
@@ -168,7 +224,7 @@ mod bytebuf {
     }
 
     impl ser::Serialize for ByteBuf {
-        fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
             where S: ser::Serializer
         {
             serializer.serialize_bytes(self)
@@ -181,15 +237,19 @@ mod bytebuf {
     impl de::Visitor for ByteBufVisitor {
         type Value = ByteBuf;
 
+        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+            formatter.write_str("byte array")
+        }
+
         #[inline]
-        fn visit_unit<E>(&mut self) -> Result<ByteBuf, E>
+        fn visit_unit<E>(self) -> Result<ByteBuf, E>
             where E: de::Error,
         {
             Ok(ByteBuf::new())
         }
 
         #[inline]
-        fn visit_seq<V>(&mut self, mut visitor: V) -> Result<ByteBuf, V::Error>
+        fn visit_seq<V>(self, mut visitor: V) -> Result<ByteBuf, V::Error>
             where V: de::SeqVisitor,
         {
             let (len, _) = visitor.size_hint();
@@ -199,20 +259,30 @@ mod bytebuf {
                 values.push(value);
             }
 
-            try!(visitor.end());
-
             Ok(ByteBuf::from(values))
         }
 
         #[inline]
-        fn visit_bytes<E>(&mut self, v: &[u8]) -> Result<ByteBuf, E>
+        fn visit_bytes<E>(self, v: &[u8]) -> Result<ByteBuf, E>
             where E: de::Error,
         {
-            self.visit_byte_buf(v.to_vec())
+            Ok(ByteBuf::from(v))
         }
 
         #[inline]
-        fn visit_byte_buf<E>(&mut self, v: Vec<u8>) -> Result<ByteBuf, E>
+        fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<ByteBuf, E>
+            where E: de::Error,
+        {
+            Ok(ByteBuf::from(v))
+        }
+
+        fn visit_str<E>(self, v: &str) -> Result<ByteBuf, E>
+            where E: de::Error,
+        {
+            Ok(ByteBuf::from(v))
+        }
+
+        fn visit_string<E>(self, v: String) -> Result<ByteBuf, E>
             where E: de::Error,
         {
             Ok(ByteBuf::from(v))
@@ -221,10 +291,10 @@ mod bytebuf {
 
     impl de::Deserialize for ByteBuf {
         #[inline]
-        fn deserialize<D>(deserializer: &mut D) -> Result<ByteBuf, D::Error>
+        fn deserialize<D>(deserializer: D) -> Result<ByteBuf, D::Error>
             where D: de::Deserializer
         {
-            deserializer.deserialize_bytes(ByteBufVisitor)
+            deserializer.deserialize_byte_buf(ByteBufVisitor)
         }
     }
 }

serde/src/de/private.rs

@@ -0,0 +1,39 @@
+use core::marker::PhantomData;
+
+use de::{Deserialize, Deserializer, Error, Visitor};
+
+/// If the missing field is of type `Option<T>` then treat is as `None`,
+/// otherwise it is an error.
+pub fn missing_field<V, E>(field: &'static str) -> Result<V, E>
+    where V: Deserialize,
+          E: Error
+{
+    struct MissingFieldDeserializer<E>(&'static str, PhantomData<E>);
+
+    impl<E> Deserializer for MissingFieldDeserializer<E>
+        where E: Error
+    {
+        type Error = E;
+
+        fn deserialize<V>(self, _visitor: V) -> Result<V::Value, E>
+            where V: Visitor
+        {
+            Err(Error::missing_field(self.0))
+        }
+
+        fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, E>
+            where V: Visitor
+        {
+            visitor.visit_none()
+        }
+
+        forward_to_deserialize! {
+            bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string unit seq
+            seq_fixed_size bytes byte_buf map unit_struct newtype_struct
+            tuple_struct struct struct_field tuple enum ignored_any
+        }
+    }
+
+    let deserializer = MissingFieldDeserializer(field, PhantomData);
+    Deserialize::deserialize(deserializer)
+}

serde/src/error.rs

@@ -1,30 +1,7 @@
 //! A stand-in for `std::error`
-use core::any::TypeId;
 use core::fmt::{Debug, Display};
 
-
 /// A stand-in for `std::error::Error`, which requires no allocation.
-#[cfg(feature = "unstable")]
-pub trait Error: Debug + Display + ::core::marker::Reflect {
-    /// A short description of the error.
-    ///
-    /// The description should not contain newlines or sentence-ending
-    /// punctuation, to facilitate embedding in larger user-facing
-    /// strings.
-    fn description(&self) -> &str;
-
-    /// The lower-level cause of this error, if any.
-    fn cause(&self) -> Option<&Error> { None }
-
-    /// Get the `TypeId` of `self`
-    #[doc(hidden)]
-    fn type_id(&self) -> TypeId where Self: 'static {
-        TypeId::of::<Self>()
-    }
-}
-
-/// A stand-in for `std::error::Error`, which requires no allocation.
-#[cfg(not(feature = "unstable"))]
 pub trait Error: Debug + Display {
     /// A short description of the error.
     ///
@@ -35,10 +12,4 @@ pub trait Error: Debug + Display {
 
     /// The lower-level cause of this error, if any.
     fn cause(&self) -> Option<&Error> { None }
-
-    /// Stubbed! Returns type_id of `()`
-    #[doc(hidden)]
-    fn type_id(&self) -> TypeId where Self: 'static {
-        TypeId::of::<()>()
-    }
 }

serde/src/export.rs

@@ -0,0 +1,33 @@
+#[cfg(all(feature = "collections", not(feature = "std")))]
+use collections::String;
+
+#[cfg(feature = "std")]
+use std::borrow::Cow;
+#[cfg(all(feature = "collections", not(feature = "std")))]
+use collections::borrow::Cow;
+
+pub use core::default::Default;
+pub use core::fmt;
+pub use core::marker::PhantomData;
+pub use core::result::Result;
+
+#[cfg(any(feature = "collections", feature = "std"))]
+pub fn from_utf8_lossy(bytes: &[u8]) -> Cow<str> {
+    String::from_utf8_lossy(bytes)
+}
+
+// The generated code calls this like:
+//
+//     let value = &_serde::export::from_utf8_lossy(bytes);
+//     Err(_serde::de::Error::unknown_variant(value, VARIANTS))
+//
+// so it is okay for the return type to be different from the std case as long
+// as the above works.
+#[cfg(not(any(feature = "collections", feature = "std")))]
+pub fn from_utf8_lossy(bytes: &[u8]) -> &str {
+    use core::str;
+    // Three unicode replacement characters if it fails. They look like a
+    // white-on-black question mark. The user will recognize it as invalid
+    // UTF-8.
+    str::from_utf8(bytes).unwrap_or("\u{fffd}\u{fffd}\u{fffd}")
+}

serde/src/lib.rs

@@ -1,49 +1,93 @@
-//! Serde Serialization Framework
+//! # Serde
 //!
-//! Serde is a powerful framework that enables serialization libraries to generically serialize
+//! Serde is a framework for ***ser***ializing and ***de***serializing Rust data
-//! Rust data structures without the overhead of runtime type information. In many situations, the
+//! structures efficiently and generically.
-//! handshake protocol between serializers and serializees can be completely optimized away,
-//! leaving serde to perform roughly the same speed as a hand written serializer for a specific
-//! type.
 //!
-//! For a detailed tutorial on the different ways to use serde please check out the
+//! The Serde ecosystem consists of data structures that know how to serialize
-//! [github repository](https://github.com/serde-rs/serde)
+//! and deserialize themselves along with data formats that know how to
+//! serialize and deserialize other things. Serde provides the layer by which
+//! these two groups interact with each other, allowing any supported data
+//! structure to be serialized and deserialized using any supported data format.
+//!
+//! See the Serde website https://serde.rs/ for additional documentation and
+//! usage examples.
+//!
+//! ### Design
+//!
+//! Where many other languages rely on runtime reflection for serializing data,
+//! Serde is instead built on Rust's powerful trait system. A data structure
+//! that knows how to serialize and deserialize itself is one that implements
+//! Serde's `Serialize` and `Deserialize` traits (or uses Serde's code
+//! generation to automatically derive implementations at compile time). This
+//! avoids any overhead of reflection or runtime type information. In fact in
+//! many situations the interaction between data structure and data format can
+//! be completely optimized away by the Rust compiler, leaving Serde
+//! serialization to perform roughly the same speed as a handwritten serializer
+//! for the specific selection of data structure and data format.
+//!
+//! ### Data formats
+//!
+//! The following is a partial list of data formats that have been implemented
+//! for Serde by the community.
+//!
+//! - [JSON](https://github.com/serde-rs/json), the ubiquitous JavaScript Object
+//!   Notation used by many HTTP APIs.
+//! - [Bincode](https://github.com/TyOverby/bincode), a compact binary format
+//!   used for IPC within the Servo rendering engine.
+//! - [CBOR](https://github.com/pyfisch/cbor), a Concise Binary Object
+//!   Representation designed for small message size without the need for
+//!   version negotiation.
+//! - [YAML](https://github.com/dtolnay/serde-yaml), a popular human-friendly
+//!   configuration language that ain't markup language.
+//! - [MessagePack](https://github.com/3Hren/msgpack-rust), an efficient binary
+//!   format that resembles a compact JSON.
+//! - [TOML](https://github.com/alexcrichton/toml-rs), a minimal configuration
+//!   format used by [Cargo](http://doc.crates.io/manifest.html).
+//! - [Pickle](https://github.com/birkenfeld/serde-pickle), a format common in
+//!   the Python world.
+//! - [Hjson](https://github.com/laktak/hjson-rust), a variant of JSON designed
+//!   to be readable and writable by humans.
+//! - [BSON](https://github.com/zonyitoo/bson-rs), the data storage and network
+//!   transfer format used by MongoDB.
+//! - [URL](https://github.com/nox/serde_urlencoded), the x-www-form-urlencoded
+//!   format.
+//! - [XML](https://github.com/serde-rs/xml), the flexible machine-friendly W3C
+//!   standard. *(deserialization only)*
+//! - [Envy](https://github.com/softprops/envy), a way to deserialize
+//!   environment variables into Rust structs. *(deserialization only)*
+//! - [Redis](https://github.com/OneSignal/serde-redis), deserialize values from
+//!   Redis when using [redis-rs](https://crates.io/crates/redis).
+//!   *(deserialization only)*
 
 #![doc(html_root_url="https://docs.serde.rs")]
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(feature = "unstable", feature(reflect_marker, unicode, nonzero, plugin, step_trait, zero_one))]
+#![cfg_attr(feature = "unstable", feature(nonzero, inclusive_range, zero_one))]
 #![cfg_attr(feature = "alloc", feature(alloc))]
 #![cfg_attr(feature = "collections", feature(collections, enumset))]
+#![cfg_attr(feature = "clippy", feature(plugin))]
 #![cfg_attr(feature = "clippy", plugin(clippy))]
-#![cfg_attr(feature = "clippy", allow(linkedlist))]
+#![cfg_attr(feature = "clippy", allow(linkedlist, type_complexity))]
-
-#![cfg_attr(any(not(feature = "std"), feature = "unstable"), allow(unused_variables, unused_imports, unused_features, dead_code))]
-
 #![deny(missing_docs)]
 
-#[cfg(all(feature = "unstable", feature = "collections"))]
+#[cfg(feature = "collections")]
 extern crate collections;
 
-#[cfg(all(feature = "unstable", feature = "alloc"))]
+#[cfg(feature = "alloc")]
 extern crate alloc;
 
+#[cfg(feature = "unstable")]
+extern crate core as actual_core;
+
 #[cfg(feature = "std")]
 mod core {
     pub use std::{ops, hash, fmt, cmp, marker, mem, i8, i16, i32, i64, u8, u16, u32, u64, isize,
-            usize, f32, f64, char, str, num, slice, iter};
+            usize, f32, f64, char, str, num, slice, iter, cell, default, result};
     #[cfg(feature = "unstable")]
-    extern crate core;
+    pub use actual_core::nonzero;
-    #[cfg(feature = "unstable")]
-    pub use self::core::nonzero;
 }
 
 pub use ser::{Serialize, Serializer};
-pub use de::{Deserialize, Deserializer, Error};
+pub use de::{Deserialize, Deserializer};
-
-#[cfg(not(feature = "std"))]
-macro_rules! format {
-    ($s:expr, $($rest:tt)*) => ($s)
-}
 
 #[macro_use]
 mod macros;
@@ -51,8 +95,13 @@ mod macros;
 pub mod bytes;
 pub mod de;
 #[cfg(feature = "std")]
+#[doc(hidden)]
 pub mod iter;
 pub mod ser;
-#[cfg(not(feature = "std"))]
+#[cfg_attr(feature = "std", doc(hidden))]
 pub mod error;
 mod utils;
+
+// Generated code uses these to support no_std. Not public API.
+#[doc(hidden)]
+pub mod export;

serde/src/macros.rs

@@ -4,7 +4,7 @@
 macro_rules! forward_to_deserialize_method {
     ($func:ident($($arg:ty),*)) => {
         #[inline]
-        fn $func<__V>(&mut self, $(_: $arg,)* visitor: __V) -> ::std::result::Result<__V::Value, Self::Error>
+        fn $func<__V>(self, $(_: $arg,)* visitor: __V) -> ::std::result::Result<__V::Value, Self::Error>
             where __V: $crate::de::Visitor
         {
             self.deserialize(visitor)
@@ -18,7 +18,7 @@ macro_rules! forward_to_deserialize_method {
 macro_rules! forward_to_deserialize_method {
     ($func:ident($($arg:ty),*)) => {
         #[inline]
-        fn $func<__V>(&mut self, $(_: $arg,)* visitor: __V) -> ::core::result::Result<__V::Value, Self::Error>
+        fn $func<__V>(self, $(_: $arg,)* visitor: __V) -> ::core::result::Result<__V::Value, Self::Error>
             where __V: $crate::de::Visitor
         {
             self.deserialize(visitor)
@@ -26,43 +26,12 @@ macro_rules! forward_to_deserialize_method {
     };
 }
 
-#[cfg(feature = "std")]
-#[doc(hidden)]
-#[macro_export]
-macro_rules! forward_to_deserialize_enum {
-    () => {
-        #[inline]
-        fn deserialize_enum<__V>(&mut self, _: &str, _: &[&str], _: __V) -> ::std::result::Result<__V::Value, Self::Error>
-            where __V: $crate::de::EnumVisitor
-        {
-            Err($crate::de::Error::invalid_type($crate::de::Type::Enum))
-        }
-    };
-}
-
-#[cfg(not(feature = "std"))]
-#[doc(hidden)]
-#[macro_export]
-macro_rules! forward_to_deserialize_enum {
-    () => {
-        #[inline]
-        fn deserialize_enum<__V>(&mut self, _: &str, _: &[&str], _: __V) -> ::core::result::Result<__V::Value, Self::Error>
-            where __V: $crate::de::EnumVisitor
-        {
-            Err($crate::de::Error::invalid_type($crate::de::Type::Enum))
-        }
-    };
-}
-
 #[doc(hidden)]
 #[macro_export]
 macro_rules! forward_to_deserialize_helper {
     (bool) => {
         forward_to_deserialize_method!{deserialize_bool()}
     };
-    (usize) => {
-        forward_to_deserialize_method!{deserialize_usize()}
-    };
     (u8) => {
         forward_to_deserialize_method!{deserialize_u8()}
     };
@@ -75,9 +44,6 @@ macro_rules! forward_to_deserialize_helper {
     (u64) => {
         forward_to_deserialize_method!{deserialize_u64()}
     };
-    (isize) => {
-        forward_to_deserialize_method!{deserialize_isize()}
-    };
     (i8) => {
         forward_to_deserialize_method!{deserialize_i8()}
     };
@@ -120,6 +86,9 @@ macro_rules! forward_to_deserialize_helper {
     (bytes) => {
         forward_to_deserialize_method!{deserialize_bytes()}
     };
+    (byte_buf) => {
+        forward_to_deserialize_method!{deserialize_byte_buf()}
+    };
     (map) => {
         forward_to_deserialize_method!{deserialize_map()}
     };
@@ -141,36 +110,78 @@ macro_rules! forward_to_deserialize_helper {
     (tuple) => {
         forward_to_deserialize_method!{deserialize_tuple(usize)}
     };
+    (enum) => {
+        forward_to_deserialize_method!{deserialize_enum(&'static str, &'static [&'static str])}
+    };
     (ignored_any) => {
         forward_to_deserialize_method!{deserialize_ignored_any()}
     };
-    (enum) => {
-        forward_to_deserialize_enum!();
-    };
 }
 
-/// Helper to forward `Deserializer` methods to `Deserializer::deserialize`.
+// Super explicit first paragraph because this shows up at the top level and
-/// Every given method ignores all arguments and forwards to `deserialize`.
+// trips up people who are just looking for basic Serialize / Deserialize
-/// Note that `deserialize_enum` simply returns an `Error::invalid_type`; a
+// documentation.
-/// better approach is tracked in [serde-rs/serde#521][1].
+//
+/// Helper macro when implementing the `Deserializer` part of a new data format
+/// for Serde.
 ///
-/// ```rust,ignore
+/// Some `Deserializer` implementations for self-describing formats do not care
+/// what hint the `Visitor` gives them, they just want to blindly call the
+/// `Visitor` method corresponding to the data they can tell is in the input.
+/// This requires repetitive implementations of all the `Deserializer` trait
+/// methods.
+///
+/// ```rust
+/// # #[macro_use] extern crate serde;
+/// # use serde::de::{value, Deserializer, Visitor};
+/// # pub struct MyDeserializer;
+/// # impl Deserializer for MyDeserializer {
+/// #     type Error = value::Error;
+/// #     fn deserialize<V>(self, _: V) -> Result<V::Value, Self::Error>
+/// #         where V: Visitor
+/// #     { unimplemented!() }
+/// #
+/// #[inline]
+/// fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+///     where V: Visitor
+/// {
+///     self.deserialize(visitor)
+/// }
+/// #     forward_to_deserialize! {
+/// #         u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string unit option
+/// #         seq seq_fixed_size bytes byte_buf map unit_struct newtype_struct
+/// #         tuple_struct struct struct_field tuple enum ignored_any
+/// #     }
+/// # }
+/// # fn main() {}
+/// ```
+///
+/// The `forward_to_deserialize!` macro implements these simple forwarding
+/// methods so that they forward directly to `Deserializer::deserialize`. You
+/// can choose which methods to forward.
+///
+/// ```rust
+/// # #[macro_use] extern crate serde;
+/// # use serde::de::{value, Deserializer, Visitor};
+/// # pub struct MyDeserializer;
 /// impl Deserializer for MyDeserializer {
-///     fn deserialize<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+/// #   type Error = value::Error;
+///     fn deserialize<V>(self, visitor: V) -> Result<V::Value, Self::Error>
 ///         where V: Visitor
 ///     {
 ///         /* ... */
+/// #       let _ = visitor;
+/// #       unimplemented!()
 ///     }
 ///
 ///     forward_to_deserialize! {
-///         bool usize u8 u16 u32 u64 isize i8 i16 i32 i64 f32 f64 char str string
+///         bool u8 u16 u32 u64 i8 i16 i32 i64 f32 f64 char str string unit option
-///         unit option seq seq_fixed_size bytes map unit_struct newtype_struct
+///         seq seq_fixed_size bytes byte_buf map unit_struct newtype_struct
 ///         tuple_struct struct struct_field tuple enum ignored_any
 ///     }
 /// }
+/// # fn main() {}
 /// ```
-///
-/// [1]: https://github.com/serde-rs/serde/issues/521
 #[macro_export]
 macro_rules! forward_to_deserialize {
     ($($func:ident)*) => {

serde/src/ser/impls.rs

@@ -1,9 +1,3 @@
-//! Implementations for all of Rust's builtin types. Tuples implement the `Serialize` trait if they
-//! have at most 16 fields. Arrays implement the `Serialize` trait if their length is 32 or less.
-//! You can always forward array serialization to slice serialization, which works for any length.
-//! Long tuples are best replaced by tuple structs, for which you can use `derive(Serialize)`. In
-//! that case the number of fields is irrelevant.
-
 #[cfg(feature = "std")]
 use std::borrow::Cow;
 #[cfg(all(feature = "collections", not(feature = "std")))]
@@ -30,19 +24,18 @@ use collections::{
     Vec,
 };
 
-#[cfg(all(feature = "unstable", feature = "collections"))]
+#[cfg(feature = "collections")]
 use collections::enum_set::{CLike, EnumSet};
-#[cfg(all(feature = "unstable", feature = "collections"))]
+#[cfg(feature = "collections")]
 use collections::borrow::ToOwned;
 
+#[cfg(feature = "std")]
 use core::hash::{Hash, BuildHasher};
 #[cfg(feature = "unstable")]
 use core::iter;
 #[cfg(feature = "std")]
 use std::net;
 #[cfg(feature = "unstable")]
-use core::num;
-#[cfg(feature = "unstable")]
 use core::ops;
 #[cfg(feature = "std")]
 use std::path;
@@ -67,33 +60,39 @@ use core::marker::PhantomData;
 use core::nonzero::{NonZero, Zeroable};
 
 use super::{
-    Error,
     Serialize,
+    SerializeSeq,
+    SerializeTuple,
     Serializer,
 };
+#[cfg(any(feature = "std", feature = "unstable"))]
+use super::Error;
+
+#[cfg(feature = "unstable")]
+use super::Iterator;
 
 ///////////////////////////////////////////////////////////////////////////////
 
 macro_rules! impl_visit {
-    ($ty:ty, $method:ident) => {
+    ($ty:ty, $method:ident $($cast:tt)*) => {
         impl Serialize for $ty {
             #[inline]
-            fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
                 where S: Serializer,
             {
-                serializer.$method(*self)
+                serializer.$method(*self $($cast)*)
             }
         }
     }
 }
 
 impl_visit!(bool, serialize_bool);
-impl_visit!(isize, serialize_isize);
+impl_visit!(isize, serialize_i64 as i64);
 impl_visit!(i8, serialize_i8);
 impl_visit!(i16, serialize_i16);
 impl_visit!(i32, serialize_i32);
 impl_visit!(i64, serialize_i64);
-impl_visit!(usize, serialize_usize);
+impl_visit!(usize, serialize_u64 as u64);
 impl_visit!(u8, serialize_u8);
 impl_visit!(u16, serialize_u16);
 impl_visit!(u32, serialize_u32);
@@ -106,7 +105,7 @@ impl_visit!(char, serialize_char);
 
 impl Serialize for str {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         serializer.serialize_str(self)
@@ -116,7 +115,7 @@ impl Serialize for str {
 #[cfg(any(feature = "std", feature = "collections"))]
 impl Serialize for String {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         (&self[..]).serialize(serializer)
@@ -125,9 +124,11 @@ impl Serialize for String {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-impl<T> Serialize for Option<T> where T: Serialize {
+impl<T> Serialize for Option<T>
+    where T: Serialize
+{
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         match *self {
@@ -141,7 +142,7 @@ impl<T> Serialize for Option<T> where T: Serialize {
 
 impl<T> Serialize for PhantomData<T> {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         serializer.serialize_unit_struct("PhantomData")
@@ -155,14 +156,14 @@ impl<T> Serialize for [T]
     where T: Serialize,
 {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
-        let mut state = try!(serializer.serialize_seq(Some(self.len())));
+        let mut seq = try!(serializer.serialize_seq(Some(self.len())));
         for e in self {
-            try!(serializer.serialize_seq_elt(&mut state, e));
+            try!(seq.serialize_element(e));
         }
-        serializer.serialize_seq_end(state)
+        seq.end()
     }
 }
 
@@ -172,14 +173,14 @@ macro_rules! array_impls {
     ($len:expr) => {
         impl<T> Serialize for [T; $len] where T: Serialize {
             #[inline]
-            fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+            fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
                 where S: Serializer,
             {
-                let mut state = try!(serializer.serialize_seq_fixed_size($len));
+                let mut seq = try!(serializer.serialize_seq_fixed_size($len));
                 for e in self {
-                    try!(serializer.serialize_seq_elt(&mut state, e));
+                    try!(seq.serialize_element(e));
                 }
-                serializer.serialize_seq_end(state)
+                seq.end()
             }
         }
     }
@@ -221,17 +222,44 @@ array_impls!(32);
 
 ///////////////////////////////////////////////////////////////////////////////
 
+#[cfg(feature = "unstable")]
+impl<'a, I> Serialize for Iterator<I>
+    where I: IntoIterator, <I as IntoIterator>::Item: Serialize
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer,
+    {
+        // FIXME: use specialization to prevent invalidating the object in case of clonable iterators?
+        let iter = match self.0.borrow_mut().take() {
+            Some(iter) => iter.into_iter(),
+            None => return Err(Error::custom("Iterator used twice")),
+        };
+        let size = match iter.size_hint() {
+            (lo, Some(hi)) if lo == hi => Some(lo),
+            _ => None,
+        };
+        let mut seq = try!(serializer.serialize_seq(size));
+        for e in iter {
+            try!(seq.serialize_element(&e));
+        }
+        seq.end()
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 macro_rules! serialize_seq {
     () => {
         #[inline]
-        fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
             where S: Serializer,
         {
-            let mut state = try!(serializer.serialize_seq(Some(self.len())));
+            let mut seq = try!(serializer.serialize_seq(Some(self.len())));
             for e in self {
-                try!(serializer.serialize_seq_elt(&mut state, e));
+                try!(seq.serialize_element(&e));
             }
-            serializer.serialize_seq_end(state)
+            seq.end()
         }
     }
 }
@@ -250,7 +278,7 @@ impl<T> Serialize for BTreeSet<T>
     serialize_seq!();
 }
 
-#[cfg(all(feature = "unstable", feature = "collections"))]
+#[cfg(feature = "collections")]
 impl<T> Serialize for EnumSet<T>
     where T: Serialize + CLike
 {
@@ -273,30 +301,50 @@ impl<T> Serialize for LinkedList<T>
 }
 
 #[cfg(any(feature = "std", feature = "collections"))]
-impl<T> Serialize for Vec<T> where T: Serialize {
+impl<T> Serialize for Vec<T>
+    where T: Serialize
+{
     serialize_seq!();
 }
 
 #[cfg(any(feature = "std", feature = "collections"))]
-impl<T> Serialize for VecDeque<T> where T: Serialize {
+impl<T> Serialize for VecDeque<T>
+    where T: Serialize
+{
     serialize_seq!();
 }
 
 #[cfg(feature = "unstable")]
 impl<A> Serialize for ops::Range<A>
-    where A: Serialize + Clone + iter::Step + num::One,
+    where ops::Range<A>: ExactSizeIterator + iter::Iterator<Item = A> + Clone,
-          for<'a> &'a A: ops::Add<&'a A, Output = A>,
+          A: Serialize,
 {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
-        let len = iter::Step::steps_between(&self.start, &self.end, &A::one());
+        let mut seq = try!(serializer.serialize_seq(Some(self.len())));
-        let mut state = try!(serializer.serialize_seq(len));
         for e in self.clone() {
-            try!(serializer.serialize_seq_elt(&mut state, e));
+            try!(seq.serialize_element(&e));
         }
-        serializer.serialize_seq_end(state)
+        seq.end()
+    }
+}
+
+#[cfg(feature = "unstable")]
+impl<A> Serialize for ops::RangeInclusive<A>
+    where ops::RangeInclusive<A>: ExactSizeIterator + iter::Iterator<Item = A> + Clone,
+          A: Serialize,
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer,
+    {
+        let mut seq = try!(serializer.serialize_seq(Some(self.len())));
+        for e in self.clone() {
+            try!(seq.serialize_element(&e));
+        }
+        seq.end()
     }
 }
 
@@ -304,7 +352,7 @@ impl<A> Serialize for ops::Range<A>
 
 impl Serialize for () {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         serializer.serialize_unit()
@@ -324,14 +372,14 @@ macro_rules! tuple_impls {
                 where $($T: Serialize),+
             {
                 #[inline]
-                fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+                fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
                     where S: Serializer,
                 {
-                    let mut state = try!(serializer.serialize_tuple($len));
+                    let mut tuple = try!(serializer.serialize_tuple($len));
                     $(
-                        try!(serializer.serialize_tuple_elt(&mut state, &self.$idx));
+                        try!(tuple.serialize_element(&self.$idx));
                     )+
-                    serializer.serialize_tuple_end(state)
+                    tuple.end()
                 }
             }
         )+
@@ -514,15 +562,16 @@ tuple_impls! {
 macro_rules! serialize_map {
     () => {
         #[inline]
-        fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
             where S: Serializer,
         {
-            let mut state = try!(serializer.serialize_map(Some(self.len())));
+            use super::SerializeMap;
+            let mut map = try!(serializer.serialize_map(Some(self.len())));
             for (k, v) in self {
-                try!(serializer.serialize_map_key(&mut state, k));
+                try!(map.serialize_key(k));
-                try!(serializer.serialize_map_value(&mut state, v));
+                try!(map.serialize_value(v));
             }
-            serializer.serialize_map_end(state)
+            map.end()
         }
     }
 }
@@ -548,7 +597,7 @@ impl<K, V, H> Serialize for HashMap<K, V, H>
 
 impl<'a, T: ?Sized> Serialize for &'a T where T: Serialize {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         (**self).serialize(serializer)
@@ -557,7 +606,7 @@ impl<'a, T: ?Sized> Serialize for &'a T where T: Serialize {
 
 impl<'a, T: ?Sized> Serialize for &'a mut T where T: Serialize {
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         (**self).serialize(serializer)
@@ -565,9 +614,11 @@ impl<'a, T: ?Sized> Serialize for &'a mut T where T: Serialize {
 }
 
 #[cfg(any(feature = "std", feature = "alloc"))]
-impl<T: ?Sized> Serialize for Box<T> where T: Serialize {
+impl<T: ?Sized> Serialize for Box<T>
+    where T: Serialize
+{
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         (**self).serialize(serializer)
@@ -575,9 +626,11 @@ impl<T: ?Sized> Serialize for Box<T> where T: Serialize {
 }
 
 #[cfg(any(feature = "std", feature = "alloc"))]
-impl<T> Serialize for Rc<T> where T: Serialize, {
+impl<T> Serialize for Rc<T>
+    where T: Serialize
+{
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         (**self).serialize(serializer)
@@ -585,9 +638,11 @@ impl<T> Serialize for Rc<T> where T: Serialize, {
 }
 
 #[cfg(any(feature = "std", feature = "alloc"))]
-impl<T> Serialize for Arc<T> where T: Serialize, {
+impl<T> Serialize for Arc<T>
+    where T: Serialize
+{
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         (**self).serialize(serializer)
@@ -595,9 +650,11 @@ impl<T> Serialize for Arc<T> where T: Serialize, {
 }
 
 #[cfg(any(feature = "std", feature = "collections"))]
-impl<'a, T: ?Sized> Serialize for Cow<'a, T> where T: Serialize + ToOwned, {
+impl<'a, T: ?Sized> Serialize for Cow<'a, T>
+    where T: Serialize + ToOwned
+{
     #[inline]
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         (**self).serialize(serializer)
@@ -606,8 +663,13 @@ impl<'a, T: ?Sized> Serialize for Cow<'a, T> where T: Serialize + ToOwned, {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-impl<T, E> Serialize for Result<T, E> where T: Serialize, E: Serialize {
+impl<T, E> Serialize for Result<T, E>
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer {
+    where T: Serialize,
+          E: Serialize
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
         match *self {
             Result::Ok(ref value) => {
                 serializer.serialize_newtype_variant("Result", 0, "Ok", value)
@@ -623,13 +685,14 @@ impl<T, E> Serialize for Result<T, E> where T: Serialize, E: Serialize {
 
 #[cfg(feature = "std")]
 impl Serialize for Duration {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
+        use super::SerializeStruct;
         let mut state = try!(serializer.serialize_struct("Duration", 2));
-        try!(serializer.serialize_struct_elt(&mut state, "secs", self.as_secs()));
+        try!(state.serialize_field("secs", &self.as_secs()));
-        try!(serializer.serialize_struct_elt(&mut state, "nanos", self.subsec_nanos()));
+        try!(state.serialize_field("nanos", &self.subsec_nanos()));
-        serializer.serialize_struct_end(state)
+        state.end()
     }
 }
 
@@ -637,7 +700,7 @@ impl Serialize for Duration {
 
 #[cfg(feature = "std")]
 impl Serialize for net::IpAddr {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         self.to_string().serialize(serializer)
@@ -646,7 +709,7 @@ impl Serialize for net::IpAddr {
 
 #[cfg(feature = "std")]
 impl Serialize for net::Ipv4Addr {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         self.to_string().serialize(serializer)
@@ -655,7 +718,7 @@ impl Serialize for net::Ipv4Addr {
 
 #[cfg(feature = "std")]
 impl Serialize for net::Ipv6Addr {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         self.to_string().serialize(serializer)
@@ -666,7 +729,7 @@ impl Serialize for net::Ipv6Addr {
 
 #[cfg(feature = "std")]
 impl Serialize for net::SocketAddr {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         match *self {
@@ -678,7 +741,7 @@ impl Serialize for net::SocketAddr {
 
 #[cfg(feature = "std")]
 impl Serialize for net::SocketAddrV4 {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         self.to_string().serialize(serializer)
@@ -687,7 +750,7 @@ impl Serialize for net::SocketAddrV4 {
 
 #[cfg(feature = "std")]
 impl Serialize for net::SocketAddrV6 {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         self.to_string().serialize(serializer)
@@ -698,19 +761,19 @@ impl Serialize for net::SocketAddrV6 {
 
 #[cfg(feature = "std")]
 impl Serialize for path::Path {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         match self.to_str() {
             Some(s) => s.serialize(serializer),
-            None => Err(Error::invalid_value("Path contains invalid UTF-8 characters")),
+            None => Err(Error::custom("path contains invalid UTF-8 characters")),
         }
     }
 }
 
 #[cfg(feature = "std")]
 impl Serialize for path::PathBuf {
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
         where S: Serializer,
     {
         self.as_path().serialize(serializer)
@@ -718,8 +781,12 @@ impl Serialize for path::PathBuf {
 }
 
 #[cfg(feature = "unstable")]
-impl<T> Serialize for NonZero<T> where T: Serialize + Zeroable {
+impl<T> Serialize for NonZero<T>
-    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer {
+    where T: Serialize + Zeroable
+{
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+        where S: Serializer
+    {
         (**self).serialize(serializer)
     }
 }

serde_codegen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_codegen"
-version = "0.8.16"
+version = "0.9.0"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros to auto-generate implementations for the serde framework"
@@ -21,10 +21,12 @@ with-syntex = [
 with-syn = []
 
 [dependencies]
-clippy = { version = "^0.*", optional = true }
+clippy = { version = "0.*", optional = true }
-post-expansion = "0.1.0"
+quote = "0.3.8"
-quote = "0.3"
+serde_codegen_internals = { version = "=0.11.3", default-features = false, path = "../serde_codegen_internals" }
-serde_codegen_internals = { version = "=0.10.0", default-features = false, path = "../serde_codegen_internals" }
+syn = { version = "0.10", features = ["aster", "visit"] }
-syn = { version = "0.9", features = ["aster", "visit"] }
+syntex = { version = "0.54", optional = true }
-syntex = { version = "^0.46.0", optional = true }
+syntex_syntax = { version = "0.54", optional = true }
-syntex_syntax = { version = "^0.46.0", optional = true }
+
+[badges]
+travis-ci = { repository = "serde-rs/serde" }

serde_codegen/src/de.rs

@@ -1,4 +1,4 @@
-use syn::{self, aster};
+use syn::{self, aster, Ident};
 use quote::{self, Tokens};
 
 use bound;
@@ -28,16 +28,16 @@ pub fn expand_derive_deserialize(item: &syn::MacroInput) -> Result<Tokens, Strin
 
     let where_clause = &impl_generics.where_clause;
 
-    let dummy_const = aster::id(format!("_IMPL_DESERIALIZE_FOR_{}", item.ident));
+    let dummy_const = Ident::new(format!("_IMPL_DESERIALIZE_FOR_{}", item.ident));
 
     Ok(quote! {
         #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
         const #dummy_const: () = {
             extern crate serde as _serde;
             #[automatically_derived]
-            impl #impl_generics _serde::de::Deserialize for #ty #where_clause {
+            impl #impl_generics _serde::Deserialize for #ty #where_clause {
-                fn deserialize<__D>(deserializer: &mut __D) -> ::std::result::Result<#ty, __D::Error>
+                fn deserialize<__D>(deserializer: __D) -> _serde::export::Result<#ty, __D::Error>
-                    where __D: _serde::de::Deserializer
+                    where __D: _serde::Deserializer
                 #body
             }
         };
@@ -61,7 +61,7 @@ fn build_impl_generics(item: &Item) -> syn::Generics {
         None => {
             let generics = bound::with_bound(item, &generics,
                 needs_deserialize_bound,
-                &aster::path().ids(&["_serde", "de", "Deserialize"]).build());
+                &aster::path().ids(&["_serde", "Deserialize"]).build());
             bound::with_bound(item, &generics,
                 requires_default,
                 &aster::path().global().ids(&["std", "default", "Default"]).build())
@@ -158,11 +158,11 @@ fn deserialize_visitor(generics: &syn::Generics) -> (Tokens, Tokens, Tokens) {
         let phantom_types = generics.lifetimes.iter()
             .map(|lifetime_def| {
                 let lifetime = &lifetime_def.lifetime;
-                quote!(::std::marker::PhantomData<& #lifetime ()>)
+                quote!(_serde::export::PhantomData<& #lifetime ()>)
             }).chain(generics.ty_params.iter()
                 .map(|ty_param| {
                     let ident = &ty_param.ident;
-                    quote!(::std::marker::PhantomData<#ident>)
+                    quote!(_serde::export::PhantomData<#ident>)
                 }));
 
         let all_params = generics.lifetimes.iter()
@@ -175,20 +175,14 @@ fn deserialize_visitor(generics: &syn::Generics) -> (Tokens, Tokens, Tokens) {
                     quote!(#ident)
                 }));
 
-        let ty_param_idents: Vec<_> = generics.ty_params.iter()
+        let ty_param_idents = if generics.ty_params.is_empty() {
-            .map(|t| {
-                let ident = &t.ident;
-                quote!(#ident)
-            })
-            .collect();
-
-        let ty_param_idents = if ty_param_idents.is_empty() {
             None
         } else {
+            let ty_param_idents = generics.ty_params.iter().map(|t| &t.ident);
             Some(quote!(::<#(#ty_param_idents),*>))
         };
 
-        let phantom_exprs = iter::repeat(quote!(::std::marker::PhantomData)).take(num_phantoms);
+        let phantom_exprs = iter::repeat(quote!(_serde::export::PhantomData)).take(num_phantoms);
 
         (
             quote! {
@@ -206,25 +200,30 @@ fn deserialize_unit_struct(
 ) -> Tokens {
     let type_name = item_attrs.name().deserialize_name();
 
+    let expecting = format!("unit struct {}", type_ident);
+
     quote!({
         struct __Visitor;
 
         impl _serde::de::Visitor for __Visitor {
             type Value = #type_ident;
 
+            fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
+                formatter.write_str(#expecting)
+            }
+
             #[inline]
-            fn visit_unit<__E>(&mut self) -> ::std::result::Result<#type_ident, __E>
+            fn visit_unit<__E>(self) -> _serde::export::Result<#type_ident, __E>
                 where __E: _serde::de::Error,
             {
                 Ok(#type_ident)
             }
 
             #[inline]
-            fn visit_seq<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<#type_ident, __V::Error>
+            fn visit_seq<__V>(self, _: __V) -> _serde::export::Result<#type_ident, __V::Error>
                 where __V: _serde::de::SeqVisitor,
             {
-                try!(visitor.end());
+                Ok(#type_ident)
-                self.visit_unit()
             }
         }
 
@@ -249,6 +248,10 @@ fn deserialize_tuple(
         Some(variant_ident) => quote!(#type_ident::#variant_ident),
         None => quote!(#type_ident),
     };
+    let expecting = match variant_ident {
+        Some(variant_ident) => format!("tuple variant {}::{}", type_ident, variant_ident),
+        None => format!("tuple struct {}", type_ident),
+    };
 
     let nfields = fields.len();
 
@@ -272,7 +275,7 @@ fn deserialize_tuple(
     );
 
     let dispatch = if is_enum {
-        quote!(visitor.visit_tuple(#nfields, #visitor_expr))
+        quote!(_serde::de::VariantVisitor::visit_tuple(visitor, #nfields, #visitor_expr))
     } else if nfields == 1 {
         let type_name = item_attrs.name().deserialize_name();
         quote!(deserializer.deserialize_newtype_struct(#type_name, #visitor_expr))
@@ -281,16 +284,27 @@ fn deserialize_tuple(
         quote!(deserializer.deserialize_tuple_struct(#type_name, #nfields, #visitor_expr))
     };
 
+    let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing());
+    let visitor_var = if all_skipped {
+        quote!(_)
+    } else {
+        quote!(mut visitor)
+    };
+
     quote!({
         #visitor_item
 
         impl #impl_generics _serde::de::Visitor for #visitor_ty #where_clause {
             type Value = #ty;
 
+            fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
+                formatter.write_str(#expecting)
+            }
+
             #visit_newtype_struct
 
             #[inline]
-            fn visit_seq<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<#ty, __V::Error>
+            fn visit_seq<__V>(self, #visitor_var: __V) -> _serde::export::Result<#ty, __V::Error>
                 where __V: _serde::de::SeqVisitor
             {
                 #visit_seq
@@ -308,15 +322,20 @@ fn deserialize_seq(
     fields: &[Field],
     is_struct: bool,
 ) -> Tokens {
+    let vars = (0..fields.len()).map(field_i as fn(_) -> _);
+
+    let deserialized_count = fields.iter()
+        .filter(|field| !field.attrs.skip_deserializing())
+        .count();
+    let expecting = format!("tuple of {} elements", deserialized_count);
+
     let mut index_in_seq = 0usize;
-    let let_values: Vec<_> = fields.iter()
+    let let_values = vars.clone().zip(fields)
-        .enumerate()
+        .map(|(var, field)| {
-        .map(|(i, field)| {
-            let name = aster::id(format!("__field{}", i));
             if field.attrs.skip_deserializing() {
                 let default = expr_is_missing(&field.attrs);
                 quote! {
-                    let #name = #default;
+                    let #var = #default;
                 }
             } else {
                 let visit = match field.attrs.deserialize_with() {
@@ -335,43 +354,31 @@ fn deserialize_seq(
                     }
                 };
                 let assign = quote! {
-                    let #name = match #visit {
+                    let #var = match #visit {
                         Some(value) => { value },
                         None => {
-                            try!(visitor.end());
+                            return Err(_serde::de::Error::invalid_length(#index_in_seq, &#expecting));
-                            return Err(_serde::de::Error::invalid_length(#index_in_seq));
                         }
                     };
                 };
                 index_in_seq += 1;
                 assign
             }
-        })
+        });
-        .collect();
 
     let result = if is_struct {
-        let args = fields.iter()
+        let names = fields.iter().map(|f| &f.ident);
-            .enumerate()
-            .map(|(i, field)| {
-                let ident = field.ident.clone().expect("struct contains unnamed fields");
-                let value = aster::id(format!("__field{}", i));
-                quote!(#ident: #value)
-            });
         quote! {
-            #type_path { #(#args),* }
+            #type_path { #( #names: #vars ),* }
         }
     } else {
-        let args = (0..fields.len()).map(|i| aster::id(format!("__field{}", i)));
         quote! {
-            #type_path ( #(#args),* )
+            #type_path ( #(#vars),* )
         }
     };
 
     quote! {
         #(#let_values)*
-
-        try!(visitor.end());
-
         Ok(#result)
     }
 }
@@ -401,8 +408,8 @@ fn deserialize_newtype_struct(
     };
     quote! {
         #[inline]
-        fn visit_newtype_struct<__E>(&mut self, __e: &mut __E) -> ::std::result::Result<Self::Value, __E::Error>
+        fn visit_newtype_struct<__E>(self, __e: __E) -> _serde::export::Result<Self::Value, __E::Error>
-            where __E: _serde::de::Deserializer,
+            where __E: _serde::Deserializer,
         {
             Ok(#type_path(#value))
         }
@@ -425,6 +432,10 @@ fn deserialize_struct(
         Some(variant_ident) => quote!(#type_ident::#variant_ident),
         None => quote!(#type_ident),
     };
+    let expecting = match variant_ident {
+        Some(variant_ident) => format!("struct variant {}::{}", type_ident, variant_ident),
+        None => format!("struct {}", type_ident),
+    };
 
     let visit_seq = deserialize_seq(
         type_ident,
@@ -445,7 +456,7 @@ fn deserialize_struct(
     let is_enum = variant_ident.is_some();
     let dispatch = if is_enum {
         quote! {
-            visitor.visit_struct(FIELDS, #visitor_expr)
+            _serde::de::VariantVisitor::visit_struct(visitor, FIELDS, #visitor_expr)
         }
     } else {
         let type_name = item_attrs.name().deserialize_name();
@@ -454,6 +465,13 @@ fn deserialize_struct(
         }
     };
 
+    let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing());
+    let visitor_var = if all_skipped {
+        quote!(_)
+    } else {
+        quote!(mut visitor)
+    };
+
     quote!({
         #field_visitor
 
@@ -462,15 +480,19 @@ fn deserialize_struct(
         impl #impl_generics _serde::de::Visitor for #visitor_ty #where_clause {
             type Value = #ty;
 
+            fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
+                formatter.write_str(#expecting)
+            }
+
             #[inline]
-            fn visit_seq<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<#ty, __V::Error>
+            fn visit_seq<__V>(self, #visitor_var: __V) -> _serde::export::Result<#ty, __V::Error>
                 where __V: _serde::de::SeqVisitor
             {
                 #visit_seq
             }
 
             #[inline]
-            fn visit_map<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<#ty, __V::Error>
+            fn visit_map<__V>(self, mut visitor: __V) -> _serde::export::Result<#ty, __V::Error>
                 where __V: _serde::de::MapVisitor
             {
                 #visit_map
@@ -494,48 +516,64 @@ fn deserialize_item_enum(
 
     let type_name = item_attrs.name().deserialize_name();
 
+    let expecting = format!("enum {}", type_ident);
+
+    let variant_names_idents: Vec<_> = variants.iter()
+        .enumerate()
+        .filter(|&(_, variant)| !variant.attrs.skip_deserializing())
+        .map(|(i, variant)| (variant.attrs.name().deserialize_name(), field_i(i)))
+        .collect();
+
+    let variants_stmt = {
+        let variant_names = variant_names_idents.iter().map(|&(ref name, _)| name);
+        quote! {
+            const VARIANTS: &'static [&'static str] = &[ #(#variant_names),* ];
+        }
+    };
+
     let variant_visitor = deserialize_field_visitor(
-        variants.iter()
+        variant_names_idents,
-            .map(|variant| variant.attrs.name().deserialize_name())
-            .collect(),
         item_attrs,
         true,
     );
 
-    let variant_names = variants.iter().map(|variant| variant.ident.to_string());
-
-    let variants_stmt = quote! {
-        const VARIANTS: &'static [&'static str] = &[ #(#variant_names),* ];
-    };
-
-    let ignored_arm = if item_attrs.deny_unknown_fields() {
-        None
-    } else {
-        Some(quote! {
-            __Field::__ignore => { Err(_serde::de::Error::end_of_stream()) }
-        })
-    };
-
     // Match arms to extract a variant from a string
-    let mut variant_arms = vec![];
+    let variant_arms = variants.iter()
-    for (i, variant) in variants.iter().enumerate() {
+        .enumerate()
-        let variant_name = aster::id(format!("__field{}", i));
+        .filter(|&(_, variant)| !variant.attrs.skip_deserializing())
-        let variant_name = quote!(__Field::#variant_name);
+        .map(|(i, variant)| {
+            let variant_name = field_i(i);
 
-        let block = deserialize_variant(
+            let block = deserialize_variant(
-            type_ident,
+                type_ident,
-            impl_generics,
+                impl_generics,
-            ty.clone(),
+                ty.clone(),
-            variant,
+                variant,
-            item_attrs,
+                item_attrs,
-        );
+            );
 
-        let arm = quote! {
+            quote! {
-            #variant_name => #block
+                (__Field::#variant_name, visitor) => #block
-        };
+            }
-        variant_arms.push(arm);
+        });
-    }
+
-    variant_arms.extend(ignored_arm.into_iter());
+    let all_skipped = variants.iter().all(|variant| variant.attrs.skip_deserializing());
+    let match_variant = if all_skipped {
+        // This is an empty enum like `enum Impossible {}` or an enum in which
+        // all variants have `#[serde(skip_deserializing)]`.
+        quote! {
+            // FIXME: Once we drop support for Rust 1.15:
+            // let Err(err) = visitor.visit_variant::<__Field>();
+            // Err(err)
+            visitor.visit_variant::<__Field>().map(|(impossible, _)| match impossible {})
+        }
+    } else {
+        quote! {
+            match try!(visitor.visit_variant()) {
+                #(#variant_arms)*
+            }
+        }
+    };
 
     let (visitor_item, visitor_ty, visitor_expr) = deserialize_visitor(impl_generics);
 
@@ -544,15 +582,17 @@ fn deserialize_item_enum(
 
         #visitor_item
 
-        impl #impl_generics _serde::de::EnumVisitor for #visitor_ty #where_clause {
+        impl #impl_generics _serde::de::Visitor for #visitor_ty #where_clause {
             type Value = #ty;
 
-            fn visit<__V>(&mut self, mut visitor: __V) -> ::std::result::Result<#ty, __V::Error>
+            fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
-                where __V: _serde::de::VariantVisitor,
+                formatter.write_str(#expecting)
+            }
+
+            fn visit_enum<__V>(self, visitor: __V) -> _serde::export::Result<#ty, __V::Error>
+                where __V: _serde::de::EnumVisitor,
             {
-                match try!(visitor.visit_variant()) {
+                #match_variant
-                    #(#variant_arms)*
-                }
             }
         }
 
@@ -574,7 +614,7 @@ fn deserialize_variant(
     match variant.style {
         Style::Unit => {
             quote!({
-                try!(visitor.visit_unit());
+                try!(_serde::de::VariantVisitor::visit_unit(visitor));
                 Ok(#type_ident::#variant_ident)
             })
         }
@@ -618,7 +658,9 @@ fn deserialize_newtype_variant(
     let visit = match field.attrs.deserialize_with() {
         None => {
             let field_ty = &field.ty;
-            quote!(try!(visitor.visit_newtype::<#field_ty>()))
+            quote! {
+                try!(_serde::de::VariantVisitor::visit_newtype::<#field_ty>(visitor))
+            }
         }
         Some(path) => {
             let (wrapper, wrapper_impl, wrapper_ty) = wrap_deserialize_with(
@@ -626,7 +668,7 @@ fn deserialize_newtype_variant(
             quote!({
                 #wrapper
                 #wrapper_impl
-                try!(visitor.visit_newtype::<#wrapper_ty>()).value
+                try!(_serde::de::VariantVisitor::visit_newtype::<#wrapper_ty>(visitor)).value
             })
         }
     };
@@ -636,105 +678,63 @@ fn deserialize_newtype_variant(
 }
 
 fn deserialize_field_visitor(
-    field_names: Vec<String>,
+    fields: Vec<(String, Ident)>,
     item_attrs: &attr::Item,
     is_variant: bool,
 ) -> Tokens {
-    // Create the field names for the fields.
+    let field_strs = fields.iter().map(|&(ref name, _)| name);
-    let field_idents: Vec<_> = (0 .. field_names.len())
+    let field_bytes = fields.iter().map(|&(ref name, _)| quote::ByteStr(name));
-        .map(|i| aster::id(format!("__field{}", i)))
+    let field_idents: &Vec<_> = &fields.iter().map(|&(_, ref ident)| ident).collect();
-        .collect();
 
-    let ignore_variant = if item_attrs.deny_unknown_fields() {
+    let ignore_variant = if is_variant || item_attrs.deny_unknown_fields() {
         None
     } else {
         Some(quote!(__ignore,))
     };
 
-    let index_field_arms: Vec<_> = field_idents.iter()
+    let visit_index = if is_variant {
-        .enumerate()
+        let variant_indices = 0u32..;
-        .map(|(field_index, field_ident)| {
+        let fallthrough_msg = format!("variant index 0 <= i < {}", fields.len());
-            quote! {
+        Some(quote! {
-                #field_index => { Ok(__Field::#field_ident) }
+            fn visit_u32<__E>(self, value: u32) -> _serde::export::Result<__Field, __E>
+                where __E: _serde::de::Error
+            {
+                match value {
+                    #(
+                        #variant_indices => Ok(__Field::#field_idents),
+                    )*
+                    _ => Err(_serde::de::Error::invalid_value(
+                                _serde::de::Unexpected::Unsigned(value as u64),
+                                &#fallthrough_msg))
+                }
             }
         })
-        .collect();
-
-    let (index_error_msg, unknown_ident) = if is_variant {
-        ("expected a variant", aster::id("unknown_variant"))
     } else {
-        ("expected a field", aster::id("unknown_field"))
+        None
     };
 
-    let fallthrough_index_arm_expr = if !is_variant && !item_attrs.deny_unknown_fields() {
+    let fallthrough_arm = if is_variant {
+        quote! {
+            Err(_serde::de::Error::unknown_variant(value, VARIANTS))
+        }
+    } else if item_attrs.deny_unknown_fields() {
+        quote! {
+            Err(_serde::de::Error::unknown_field(value, FIELDS))
+        }
+    } else {
         quote! {
             Ok(__Field::__ignore)
         }
-    } else {
-        quote! {
-            Err(_serde::de::Error::invalid_value(#index_error_msg))
-        }
     };
 
-    let index_body = quote! {
+    let bytes_to_str = if is_variant || item_attrs.deny_unknown_fields() {
-        match value {
+        Some(quote! {
-            #(#index_field_arms)*
+            // TODO https://github.com/serde-rs/serde/issues/666
-            _ => #fallthrough_index_arm_expr
+            // update this to use str::from_utf8(value).unwrap_or("���") on no_std
-        }
+            let value = &_serde::export::from_utf8_lossy(value);
-    };
-
-    // Match arms to extract a field from a string
-    let str_field_arms: Vec<_> = field_idents.iter().zip(field_names.iter())
-        .map(|(field_ident, field_name)| {
-            quote! {
-                #field_name => { Ok(__Field::#field_ident) }
-            }
         })
-        .collect();
-
-    let fallthrough_str_arm_expr = if !is_variant && !item_attrs.deny_unknown_fields() {
-        quote! {
-            Ok(__Field::__ignore)
-        }
     } else {
-        quote! {
+        None
-            Err(_serde::de::Error::#unknown_ident(value))
-        }
-    };
-
-    let str_body = quote! {
-        match value {
-            #(#str_field_arms)*
-            _ => #fallthrough_str_arm_expr
-        }
-    };
-
-    // Match arms to extract a field from a string
-    let bytes_field_arms: Vec<_> = field_idents.iter().zip(field_names.iter())
-        .map(|(field_ident, field_name)| {
-            let bytes_field_name = quote::ByteStr(field_name);
-            quote! {
-                #bytes_field_name => { Ok(__Field::#field_ident) }
-            }
-        })
-        .collect();
-
-    let fallthrough_bytes_arm_expr = if !is_variant && !item_attrs.deny_unknown_fields() {
-        quote! {
-            Ok(__Field::__ignore)
-        }
-    } else {
-        quote!({
-            let value = ::std::string::String::from_utf8_lossy(value);
-            Err(_serde::de::Error::#unknown_ident(&value))
-        })
-    };
-
-    let bytes_body = quote! {
-        match value {
-            #(#bytes_field_arms)*
-            _ => #fallthrough_bytes_arm_expr
-        }
     };
 
     quote! {
@@ -744,32 +744,45 @@ fn deserialize_field_visitor(
             #ignore_variant
         }
 
-        impl _serde::de::Deserialize for __Field {
+        impl _serde::Deserialize for __Field {
             #[inline]
-            fn deserialize<__D>(deserializer: &mut __D) -> ::std::result::Result<__Field, __D::Error>
+            fn deserialize<__D>(deserializer: __D) -> _serde::export::Result<__Field, __D::Error>
-                where __D: _serde::de::Deserializer,
+                where __D: _serde::Deserializer,
             {
                 struct __FieldVisitor;
 
                 impl _serde::de::Visitor for __FieldVisitor {
                     type Value = __Field;
 
-                    fn visit_usize<__E>(&mut self, value: usize) -> ::std::result::Result<__Field, __E>
+                    fn expecting(&self, formatter: &mut _serde::export::fmt::Formatter) -> _serde::export::fmt::Result {
-                        where __E: _serde::de::Error
+                        formatter.write_str("field name")
-                    {
-                        #index_body
                     }
 
-                    fn visit_str<__E>(&mut self, value: &str) -> ::std::result::Result<__Field, __E>
+                    #visit_index
+
+                    fn visit_str<__E>(self, value: &str) -> _serde::export::Result<__Field, __E>
                         where __E: _serde::de::Error
                     {
-                        #str_body
+                        match value {
+                            #(
+                                #field_strs => Ok(__Field::#field_idents),
+                            )*
+                            _ => #fallthrough_arm
+                        }
                     }
 
-                    fn visit_bytes<__E>(&mut self, value: &[u8]) -> ::std::result::Result<__Field, __E>
+                    fn visit_bytes<__E>(self, value: &[u8]) -> _serde::export::Result<__Field, __E>
                         where __E: _serde::de::Error
                     {
-                        #bytes_body
+                        match value {
+                            #(
+                                #field_bytes => Ok(__Field::#field_idents),
+                            )*
+                            _ => {
+                                #bytes_to_str
+                                #fallthrough_arm
+                            }
+                        }
                     }
                 }
 
@@ -786,12 +799,21 @@ fn deserialize_struct_visitor(
     fields: &[Field],
     item_attrs: &attr::Item,
 ) -> (Tokens, Tokens, Tokens) {
-    let field_exprs = fields.iter()
+    let field_names_idents: Vec<_> = fields.iter()
-        .map(|field| field.attrs.name().deserialize_name())
+        .enumerate()
+        .filter(|&(_, field)| !field.attrs.skip_deserializing())
+        .map(|(i, field)| (field.attrs.name().deserialize_name(), field_i(i)))
         .collect();
 
+    let fields_stmt = {
+        let field_names = field_names_idents.iter().map(|&(ref name, _)| name);
+        quote! {
+            const FIELDS: &'static [&'static str] = &[ #(#field_names),* ];
+        }
+    };
+
     let field_visitor = deserialize_field_visitor(
-        field_exprs,
+        field_names_idents,
         item_attrs,
         false,
     );
@@ -804,14 +826,6 @@ fn deserialize_struct_visitor(
         item_attrs,
     );
 
-    let field_names = fields.iter().map(|field| {
-        field.ident.clone().expect("struct contains unnamed field").to_string()
-    });
-
-    let fields_stmt = quote! {
-        const FIELDS: &'static [&'static str] = &[ #(#field_names),* ];
-    };
-
     (field_visitor, fields_stmt, visit_map)
 }
 
@@ -823,22 +837,20 @@ fn deserialize_map(
     item_attrs: &attr::Item,
 ) -> Tokens {
     // Create the field names for the fields.
-    let fields_names = fields.iter()
+    let fields_names: Vec<_> = fields.iter()
         .enumerate()
-        .map(|(i, field)|
+        .map(|(i, field)| (field, field_i(i)))
-             (field, aster::id(format!("__field{}", i))))
+        .collect();
-        .collect::<Vec<_>>();
 
     // Declare each field that will be deserialized.
-    let let_values: Vec<_> = fields_names.iter()
+    let let_values = fields_names.iter()
         .filter(|&&(field, _)| !field.attrs.skip_deserializing())
         .map(|&(field, ref name)| {
             let field_ty = &field.ty;
             quote! {
                 let mut #name: Option<#field_ty> = None;
             }
-        })
+        });
-        .collect();
 
     // Match arms to extract a value for a field.
     let value_arms = fields_names.iter()
@@ -871,21 +883,7 @@ fn deserialize_map(
                     #name = Some(#visit);
                 }
             }
-        })
+        });
-        .collect::<Vec<_>>();
-
-    // Match arms to ignore value for fields that have `skip_deserializing`.
-    // Ignored even if `deny_unknown_fields` is set.
-    let skipped_arms = fields_names.iter()
-        .filter(|&&(field, _)| field.attrs.skip_deserializing())
-        .map(|&(_, ref name)| {
-            quote! {
-                __Field::#name => {
-                    let _ = try!(visitor.visit_value::<_serde::de::impls::IgnoredAny>());
-                }
-            }
-        })
-        .collect::<Vec<_>>();
 
     // Visit ignored values to consume them
     let ignored_arm = if item_attrs.deny_unknown_fields() {
@@ -896,6 +894,24 @@ fn deserialize_map(
         })
     };
 
+    let all_skipped = fields.iter().all(|field| field.attrs.skip_deserializing());
+    let match_keys = if item_attrs.deny_unknown_fields() && all_skipped {
+        quote! {
+            // FIXME: Once we drop support for Rust 1.15:
+            // let None::<__Field> = try!(visitor.visit_key());
+            try!(visitor.visit_key::<__Field>()).map(|impossible| match impossible {});
+        }
+    } else {
+        quote! {
+            while let Some(key) = try!(visitor.visit_key::<__Field>()) {
+                match key {
+                    #(#value_arms)*
+                    #ignored_arm
+                }
+            }
+        }
+    };
+
     let extract_values = fields_names.iter()
         .filter(|&&(field, _)| !field.attrs.skip_deserializing())
         .map(|&(field, ref name)| {
@@ -907,8 +923,7 @@ fn deserialize_map(
                     None => #missing_expr
                 };
             }
-        })
+        });
-        .collect::<Vec<_>>();
 
     let result = fields_names.iter()
         .map(|&(field, ref name)| {
@@ -924,15 +939,7 @@ fn deserialize_map(
     quote! {
         #(#let_values)*
 
-        while let Some(key) = try!(visitor.visit_key::<__Field>()) {
+        #match_keys
-            match key {
-                #(#value_arms)*
-                #(#skipped_arms)*
-                #ignored_arm
-            }
-        }
-
-        try!(visitor.end());
 
         #(#extract_values)*
 
@@ -940,6 +947,10 @@ fn deserialize_map(
     }
 }
 
+fn field_i(i: usize) -> Ident {
+    Ident::new(format!("__field{}", i))
+}
+
 /// This function wraps the expression in `#[serde(deserialize_with="...")]` in
 /// a trait to prevent it from accessing the internal `Deserialize` state.
 fn wrap_deserialize_with(
@@ -970,18 +981,18 @@ fn wrap_deserialize_with(
         quote! {
             struct __SerdeDeserializeWithStruct #impl_generics #where_clause {
                 value: #field_ty,
-                phantom: ::std::marker::PhantomData<#phantom_ty>,
+                phantom: _serde::export::PhantomData<#phantom_ty>,
             }
         },
         quote! {
-            impl #impl_generics _serde::de::Deserialize for #wrapper_ty #where_clause {
+            impl #impl_generics _serde::Deserialize for #wrapper_ty #where_clause {
-                fn deserialize<__D>(__d: &mut __D) -> ::std::result::Result<Self, __D::Error>
+                fn deserialize<__D>(__d: __D) -> _serde::export::Result<Self, __D::Error>
-                    where __D: _serde::de::Deserializer
+                    where __D: _serde::Deserializer
                 {
                     let value = try!(#deserialize_with(__d));
                     Ok(__SerdeDeserializeWithStruct {
                         value: value,
-                        phantom: ::std::marker::PhantomData,
+                        phantom: _serde::export::PhantomData,
                     })
                 }
             }
@@ -993,7 +1004,7 @@ fn wrap_deserialize_with(
 fn expr_is_missing(attrs: &attr::Field) -> Tokens {
     match *attrs.default() {
         attr::FieldDefault::Default => {
-            return quote!(::std::default::Default::default());
+            return quote!(_serde::export::Default::default());
         }
         attr::FieldDefault::Path(ref path) => {
             return quote!(#path());
@@ -1005,7 +1016,7 @@ fn expr_is_missing(attrs: &attr::Field) -> Tokens {
     match attrs.deserialize_with() {
         None => {
             quote! {
-                try!(visitor.missing_field(#name))
+                try!(_serde::de::private::missing_field(#name))
             }
         }
         Some(_) => {

serde_codegen/src/lib.rs

@@ -2,7 +2,6 @@
 #![cfg_attr(feature = "clippy", feature(plugin))]
 #![cfg_attr(feature = "clippy", allow(too_many_arguments))]
 #![cfg_attr(feature = "clippy", allow(used_underscore_binding))]
-#![cfg_attr(not(feature = "with-syntex"), feature(rustc_private, plugin))]
 
 // The `quote!` macro requires deep recursion.
 #![recursion_limit = "192"]
@@ -13,29 +12,15 @@ extern crate serde_codegen_internals as internals;
 extern crate syntex;
 
 #[cfg(feature = "with-syntex")]
-#[macro_use]
 extern crate syntex_syntax as syntax;
 
-#[cfg(not(feature = "with-syntex"))]
-#[macro_use]
-extern crate syntax;
-
-#[cfg(not(feature = "with-syntex"))]
-extern crate rustc_plugin;
-
 extern crate syn;
 #[macro_use]
 extern crate quote;
 
-#[cfg(feature = "with-syn")]
-extern crate post_expansion;
-
 #[cfg(feature = "with-syntex")]
 use std::path::Path;
 
-#[cfg(not(feature = "with-syntex"))]
-use syntax::feature_gate::AttributeType;
-
 mod bound;
 mod de;
 mod ser;
@@ -52,11 +37,11 @@ fn syntex_registry() -> syntex::Registry {
 
         impl fold::Folder for StripAttributeFolder {
             fn fold_attribute(&mut self, attr: ast::Attribute) -> Option<ast::Attribute> {
-                match attr.node.value.node {
+                if attr.value.name == "serde" {
-                    ast::MetaItemKind::List(ref n, _) if n == &"serde" => { return None; }
+                    if let ast::MetaItemKind::List(..) = attr.value.node {
-                    _ => {}
+                        return None;
+                    }
                 }
-
                 Some(attr)
             }
 
@@ -73,8 +58,8 @@ fn syntex_registry() -> syntex::Registry {
     reg.add_attr("feature(custom_derive)");
     reg.add_attr("feature(custom_attribute)");
 
-    reg.add_decorator("derive_Serialize", expand_derive_serialize);
+    reg.add_decorator("derive_Serialize", shim::expand_derive_serialize);
-    reg.add_decorator("derive_Deserialize", expand_derive_deserialize);
+    reg.add_decorator("derive_Deserialize", shim::expand_derive_deserialize);
 
     reg.add_post_expansion_pass(strip_attributes);
 
@@ -107,24 +92,9 @@ pub fn expand<S, D>(src: S, dst: D) -> Result<(), syntex::Error>
     syntex::with_extra_stack(expand_thread)
 }
 
-#[cfg(not(feature = "with-syntex"))]
-pub fn register(reg: &mut rustc_plugin::Registry) {
-    reg.register_syntax_extension(
-        syntax::parse::token::intern("derive_Serialize"),
-        syntax::ext::base::MultiDecorator(
-            Box::new(expand_derive_serialize)));
-
-    reg.register_syntax_extension(
-        syntax::parse::token::intern("derive_Deserialize"),
-        syntax::ext::base::MultiDecorator(
-            Box::new(expand_derive_deserialize)));
-
-    reg.register_attribute("serde".to_owned(), AttributeType::Normal);
-}
-
 macro_rules! shim {
     ($name:ident $pkg:ident :: $func:ident) => {
-        fn $func(
+        pub fn $func(
             cx: &mut ::syntax::ext::base::ExtCtxt,
             span: ::syntax::codemap::Span,
             meta_item: &::syntax::ast::MetaItem,
@@ -145,13 +115,12 @@ macro_rules! shim {
 
             use syntax::{attr, ast, visit};
             struct MarkSerdeAttributesUsed;
-            impl visit::Visitor for MarkSerdeAttributesUsed {
+            impl<'a> visit::Visitor<'a> for MarkSerdeAttributesUsed {
                 fn visit_attribute(&mut self, attr: &ast::Attribute) {
-                    match attr.node.value.node {
+                    if attr.value.name == "serde" {
-                        ast::MetaItemKind::List(ref name, _) if name == "serde" => {
+                        if let ast::MetaItemKind::List(..) = attr.value.node {
                             attr::mark_used(attr);
                         }
-                        _ => {}
                     }
                 }
             }
@@ -160,6 +129,7 @@ macro_rules! shim {
             use syntax::print::pprust;
             let s = pprust::item_to_string(item);
 
+            use {syn, $pkg};
             let syn_item = syn::parse_macro_input(&s).unwrap();
             let expanded = match $pkg::$func(&syn_item) {
                 Ok(expanded) => expanded.to_string(),
@@ -171,78 +141,31 @@ macro_rules! shim {
 
             use syntax::parse;
             let name = stringify!($name).to_string();
-            let cfg = Vec::new();
             let sess = cx.parse_sess;
-            let impl_item = parse::parse_item_from_source_str(name, expanded, cfg, sess);
+            let impl_item = parse::parse_item_from_source_str(name, expanded, sess);
             push(::syntax::ext::base::Annotatable::Item(impl_item.unwrap().unwrap()));
         }
     };
 }
 
-shim!(Serialize ser::expand_derive_serialize);
+#[cfg(feature = "with-syntex")]
-shim!(Deserialize de::expand_derive_deserialize);
+mod shim {
+    shim!(Serialize ser::expand_derive_serialize);
+    shim!(Deserialize de::expand_derive_deserialize);
+}
 
 #[cfg(feature = "with-syn")]
-pub fn expand_single_item(item: &str) -> Result<String, String> {
+#[doc(hidden)]
+/// Not public API. Use the serde_derive crate.
+pub fn expand_derive_serialize(item: &str) -> Result<quote::Tokens, String> {
     let syn_item = syn::parse_macro_input(item).unwrap();
-    let (ser, de, syn_item) = strip_serde_derives(syn_item);
+    ser::expand_derive_serialize(&syn_item)
-    let expanded_ser = if ser {
+}
-        Some(try!(ser::expand_derive_serialize(&syn_item)))
+
-    } else {
+#[cfg(feature = "with-syn")]
-        None
+#[doc(hidden)]
-    };
+/// Not public API. Use the serde_derive crate.
-    let expanded_de = if de {
+pub fn expand_derive_deserialize(item: &str) -> Result<quote::Tokens, String> {
-        Some(try!(de::expand_derive_deserialize(&syn_item)))
+    let syn_item = syn::parse_macro_input(item).unwrap();
-    } else {
+    de::expand_derive_deserialize(&syn_item)
-        None::<quote::Tokens>
-    };
-    let syn_item = post_expansion::strip_attrs_later(syn_item, &["serde"], "serde");
-    return Ok(quote!(#expanded_ser #expanded_de #syn_item).to_string());
-
-    fn strip_serde_derives(item: syn::MacroInput) -> (bool, bool, syn::MacroInput) {
-        let mut ser = false;
-        let mut de = false;
-        let item = syn::MacroInput {
-            attrs: item.attrs.into_iter().flat_map(|attr| {
-                if attr.is_sugared_doc || attr.style != syn::AttrStyle::Outer {
-                    return Some(attr);
-                }
-                let (name, nested) = match attr.value {
-                    syn::MetaItem::List(name, nested) => (name, nested),
-                    _ => return Some(attr)
-                };
-                if name != "derive" {
-                    return Some(syn::Attribute {
-                        style: syn::AttrStyle::Outer,
-                        value: syn::MetaItem::List(name, nested),
-                        is_sugared_doc: false,
-                    });
-                }
-                let rest: Vec<_> = nested.into_iter().filter(|nested| {
-                    match *nested {
-                        syn::MetaItem::Word(ref word) if word == "Serialize" => {
-                            ser = true;
-                            false
-                        }
-                        syn::MetaItem::Word(ref word) if word == "Deserialize" => {
-                            de = true;
-                            false
-                        }
-                        _ => true,
-                    }
-                }).collect();
-                if rest.is_empty() {
-                    None
-                } else {
-                    Some(syn::Attribute {
-                        style: syn::AttrStyle::Outer,
-                        value: syn::MetaItem::List(name, rest),
-                        is_sugared_doc: false,
-                    })
-                }
-            }).collect(),
-            ..item
-        };
-        (ser, de, item)
-    }
 }

serde_codegen/src/ser.rs

@@ -1,4 +1,4 @@
-use syn::{self, aster};
+use syn::{self, aster, Ident};
 use quote::Tokens;
 
 use bound;
@@ -22,16 +22,16 @@ pub fn expand_derive_serialize(item: &syn::MacroInput) -> Result<Tokens, String>
 
     let where_clause = &impl_generics.where_clause;
 
-    let dummy_const = aster::id(format!("_IMPL_SERIALIZE_FOR_{}", item.ident));
+    let dummy_const = Ident::new(format!("_IMPL_SERIALIZE_FOR_{}", item.ident));
 
     Ok(quote! {
         #[allow(non_upper_case_globals, unused_attributes, unused_qualifications)]
         const #dummy_const: () = {
             extern crate serde as _serde;
             #[automatically_derived]
-            impl #impl_generics _serde::ser::Serialize for #ty #where_clause {
+            impl #impl_generics _serde::Serialize for #ty #where_clause {
-                fn serialize<__S>(&self, _serializer: &mut __S) -> ::std::result::Result<(), __S::Error>
+                fn serialize<__S>(&self, _serializer: __S) -> _serde::export::Result<__S::Ok, __S::Error>
-                    where __S: _serde::ser::Serializer
+                    where __S: _serde::Serializer
                 {
                     #body
                 }
@@ -56,7 +56,7 @@ fn build_impl_generics(item: &Item) -> syn::Generics {
         None => {
             bound::with_bound(item, &generics,
                 needs_serialize_bound,
-                &aster::path().ids(&["_serde", "ser", "Serialize"]).build())
+                &aster::path().ids(&["_serde", "Serialize"]).build())
         }
     }
 }
@@ -159,7 +159,7 @@ fn serialize_tuple_struct(
         fields,
         impl_generics,
         false,
-        aster::id("serialize_tuple_struct_elt"),
+        quote!(_serde::ser::SerializeTupleStruct::serialize_field),
     );
 
     let type_name = item_attrs.name().serialize_name();
@@ -169,7 +169,7 @@ fn serialize_tuple_struct(
     quote! {
         let #let_mut __serde_state = try!(_serializer.serialize_tuple_struct(#type_name, #len));
         #(#serialize_stmts)*
-        _serializer.serialize_tuple_struct_end(__serde_state)
+        _serde::ser::SerializeTupleStruct::end(__serde_state)
     }
 }
 
@@ -184,7 +184,7 @@ fn serialize_struct(
         fields,
         impl_generics,
         false,
-        aster::id("serialize_struct_elt"),
+        quote!(_serde::ser::SerializeStruct::serialize_field),
     );
 
     let type_name = item_attrs.name().serialize_name();
@@ -210,7 +210,7 @@ fn serialize_struct(
     quote! {
         let #let_mut __serde_state = try!(_serializer.serialize_struct(#type_name, #len));
         #(#serialize_fields)*
-        _serializer.serialize_struct_end(__serde_state)
+        _serde::ser::SerializeStruct::end(__serde_state)
     }
 }
 
@@ -256,76 +256,80 @@ fn serialize_variant(
     let variant_ident = variant.ident.clone();
     let variant_name = variant.attrs.name().serialize_name();
 
-    match variant.style {
+    if variant.attrs.skip_serializing() {
-        Style::Unit => {
+        let skipped_msg = format!("the enum variant {}::{} cannot be serialized",
-            quote! {
+                                type_ident, variant_ident);
-                #type_ident::#variant_ident =>
+        let skipped_err = quote! {
-                    _serde::ser::Serializer::serialize_unit_variant(
+            Err(_serde::ser::Error::custom(#skipped_msg))
-                        _serializer,
+        };
-                        #type_name,
+        let fields_pat = match variant.style {
-                        #variant_index,
+            Style::Unit => quote!(),
-                        #variant_name,
+            Style::Newtype | Style::Tuple => quote!( (..) ),
-                    ),
+            Style::Struct => quote!( {..} ),
-            }
+        };
-        },
+        quote! {
-        Style::Newtype => {
+            #type_ident::#variant_ident #fields_pat => #skipped_err,
-            let block = serialize_newtype_variant(
-                type_name,
-                variant_index,
-                variant_name,
-                ty,
-                generics,
-                &variant.fields[0],
-            );
-
-            quote! {
-                #type_ident::#variant_ident(ref __simple_value) => #block,
-            }
-        },
-        Style::Tuple => {
-            let field_names: Vec<Tokens> = (0 .. variant.fields.len())
-                .map(|i| {
-                    let id = aster::id(format!("__field{}", i));
-                    quote!(ref #id)
-                })
-                .collect();
-
-            let pat = quote!(#type_ident::#variant_ident(#(#field_names),*));
-
-            let block = serialize_tuple_variant(
-                type_name,
-                variant_index,
-                variant_name,
-                generics,
-                ty,
-                &variant.fields,
-            );
-
-            quote! {
-                #pat => { #block }
-            }
         }
-        Style::Struct => {
+    } else { // variant wasn't skipped
-            let fields = variant.fields.iter().map(|field| {
+        match variant.style {
-                let id = match field.ident {
+            Style::Unit => {
-                    Some(ref name) => name.clone(),
+                quote! {
-                    None => panic!("struct variant has unnamed fields"),
+                    #type_ident::#variant_ident =>
-                };
+                        _serde::Serializer::serialize_unit_variant(
-                quote!(ref #id)
+                            _serializer,
-            });
+                            #type_name,
-            let pat = quote!(#type_ident::#variant_ident { #(#fields),* });
+                            #variant_index,
+                            #variant_name,
+                        ),
+                }
+            },
+            Style::Newtype => {
+                let block = serialize_newtype_variant(
+                    type_name,
+                    variant_index,
+                    variant_name,
+                    ty,
+                    generics,
+                    &variant.fields[0],
+                );
 
-            let block = serialize_struct_variant(
+                quote! {
-                variant_index,
+                    #type_ident::#variant_ident(ref __simple_value) => #block,
-                variant_name,
+                }
-                generics,
+            },
-                ty,
+            Style::Tuple => {
-                &variant.fields,
+                let field_names = (0 .. variant.fields.len())
-                item_attrs,
+                    .map(|i| Ident::new(format!("__field{}", i)));
-            );
 
-            quote! {
+                let block = serialize_tuple_variant(
-                #pat => { #block }
+                    type_name,
+                    variant_index,
+                    variant_name,
+                    generics,
+                    ty,
+                    &variant.fields,
+                );
+
+                quote! {
+                    #type_ident::#variant_ident(#(ref #field_names),*) => { #block }
+                }
+            }
+            Style::Struct => {
+                let fields = variant.fields.iter()
+                    .map(|f| f.ident.clone().expect("struct variant has unnamed fields"));
+
+                let block = serialize_struct_variant(
+                    variant_index,
+                    variant_name,
+                    generics,
+                    ty,
+                    &variant.fields,
+                    item_attrs,
+                );
+
+                quote! {
+                    #type_ident::#variant_ident { #(ref #fields),* } => { #block }
+                }
             }
         }
     }
@@ -346,7 +350,7 @@ fn serialize_newtype_variant(
     }
 
     quote! {
-        _serde::ser::Serializer::serialize_newtype_variant(
+        _serde::Serializer::serialize_newtype_variant(
             _serializer,
             #type_name,
             #variant_index,
@@ -369,7 +373,7 @@ fn serialize_tuple_variant(
         fields,
         generics,
         true,
-        aster::id("serialize_tuple_variant_elt"),
+        quote!(_serde::ser::SerializeTupleVariant::serialize_field),
     );
 
     let len = serialize_stmts.len();
@@ -382,7 +386,7 @@ fn serialize_tuple_variant(
             #variant_name,
             #len));
         #(#serialize_stmts)*
-        _serializer.serialize_tuple_variant_end(__serde_state)
+        _serde::ser::SerializeTupleVariant::end(__serde_state)
     }
 }
 
@@ -399,7 +403,7 @@ fn serialize_struct_variant(
         fields,
         generics,
         true,
-        aster::id("serialize_struct_variant_elt"),
+        quote!(_serde::ser::SerializeStructVariant::serialize_field),
     );
 
     let item_name = item_attrs.name().serialize_name();
@@ -429,7 +433,7 @@ fn serialize_struct_variant(
             #len,
         ));
         #(#serialize_fields)*
-        _serializer.serialize_struct_variant_end(__serde_state)
+        _serde::ser::SerializeStructVariant::end(__serde_state)
     }
 }
 
@@ -438,16 +442,16 @@ fn serialize_tuple_struct_visitor(
     fields: &[Field],
     generics: &syn::Generics,
     is_enum: bool,
-    func: syn::Ident,
+    func: Tokens,
 ) -> Vec<Tokens> {
     fields.iter()
         .enumerate()
         .map(|(i, field)| {
             let mut field_expr = if is_enum {
-                let id = aster::id(format!("__field{}", i));
+                let id = Ident::new(format!("__field{}", i));
                 quote!(#id)
             } else {
-                let i = aster::id(i);
+                let i = Ident::new(i);
                 quote!(&self.#i)
             };
 
@@ -460,7 +464,7 @@ fn serialize_tuple_struct_visitor(
             }
 
             let ser = quote! {
-                try!(_serializer.#func(&mut __serde_state, #field_expr));
+                try!(#func(&mut __serde_state, #field_expr));
             };
 
             match skip {
@@ -476,7 +480,7 @@ fn serialize_struct_visitor(
     fields: &[Field],
     generics: &syn::Generics,
     is_enum: bool,
-    func: syn::Ident,
+    func: Tokens,
 ) -> Vec<Tokens> {
     fields.iter()
         .filter(|&field| !field.attrs.skip_serializing())
@@ -499,7 +503,7 @@ fn serialize_struct_visitor(
             }
 
             let ser = quote! {
-                try!(_serializer.#func(&mut __serde_state, #key_expr, #field_expr));
+                try!(#func(&mut __serde_state, #key_expr, #field_expr));
             };
 
             match skip {
@@ -536,15 +540,15 @@ fn wrap_serialize_with(
             phantom: ::std::marker::PhantomData<#item_ty>,
         }
 
-        impl #wrapper_generics _serde::ser::Serialize for #wrapper_ty #where_clause {
+        impl #wrapper_generics _serde::Serialize for #wrapper_ty #where_clause {
-            fn serialize<__S>(&self, __s: &mut __S) -> ::std::result::Result<(), __S::Error>
+            fn serialize<__S>(&self, __s: __S) -> _serde::export::Result<__S::Ok, __S::Error>
-                where __S: _serde::ser::Serializer
+                where __S: _serde::Serializer
             {
                 #path(self.value, __s)
             }
         }
 
-        __SerializeWith {
+        &__SerializeWith {
             value: #value,
             phantom: ::std::marker::PhantomData::<#item_ty>,
         }
@@ -554,7 +558,7 @@ fn wrap_serialize_with(
 // Serialization of an empty struct results in code like:
 //
 //     let mut __serde_state = try!(serializer.serialize_struct("S", 0));
-//     serializer.serialize_struct_end(__serde_state)
+//     _serde::ser::SerializeStruct::end(__serde_state)
 //
 // where we want to omit the `mut` to avoid a warning.
 fn mut_if(is_mut: bool) -> Option<Tokens> {

serde_codegen_internals/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_codegen_internals"
-version = "0.10.0"
+version = "0.11.3"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "AST representation used by Serde codegen. Unstable."
@@ -14,5 +14,8 @@ include = ["Cargo.toml", "src/**/*.rs"]
 unstable-testing = ["clippy"]
 
 [dependencies]
-clippy = { version = "^0.*", optional = true }
+clippy = { version = "0.*", optional = true }
-syn = "0.9"
+syn = "0.10"
+
+[badges]
+travis-ci = { repository = "serde-rs/serde" }

serde_codegen_internals/src/attr.rs

@@ -1,5 +1,7 @@
 use Ctxt;
 use syn;
+use syn::MetaItem::{List, NameValue, Word};
+use syn::NestedMetaItem::{Literal, MetaItem};
 
 // This module handles parsing of `#[serde(...)]` attributes. The entrypoints
 // are `attr::Item::from_ast`, `attr::Variant::from_ast`, and
@@ -105,7 +107,7 @@ impl Item {
             for meta_item in meta_items {
                 match meta_item {
                     // Parse `#[serde(rename="foo")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "rename" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "rename" => {
                         if let Ok(s) = get_string_from_lit(cx, name.as_ref(), name.as_ref(), lit) {
                             ser_name.set(s.clone());
                             de_name.set(s);
@@ -113,7 +115,7 @@ impl Item {
                     }
 
                     // Parse `#[serde(rename(serialize="foo", deserialize="bar"))]`
-                    syn::MetaItem::List(ref name, ref meta_items) if name == "rename" => {
+                    MetaItem(List(ref name, ref meta_items)) if name == "rename" => {
                         if let Ok((ser, de)) = get_renames(cx, meta_items) {
                             ser_name.set_opt(ser);
                             de_name.set_opt(de);
@@ -121,12 +123,12 @@ impl Item {
                     }
 
                     // Parse `#[serde(deny_unknown_fields)]`
-                    syn::MetaItem::Word(ref name) if name == "deny_unknown_fields" => {
+                    MetaItem(Word(ref name)) if name == "deny_unknown_fields" => {
                         deny_unknown_fields.set_true();
                     }
 
                     // Parse `#[serde(bound="D: Serialize")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "bound" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "bound" => {
                         if let Ok(where_predicates) = parse_lit_into_where(cx, name.as_ref(), name.as_ref(), lit) {
                             ser_bound.set(where_predicates.clone());
                             de_bound.set(where_predicates);
@@ -134,17 +136,21 @@ impl Item {
                     }
 
                     // Parse `#[serde(bound(serialize="D: Serialize", deserialize="D: Deserialize"))]`
-                    syn::MetaItem::List(ref name, ref meta_items) if name == "bound" => {
+                    MetaItem(List(ref name, ref meta_items)) if name == "bound" => {
                         if let Ok((ser, de)) = get_where_predicates(cx, meta_items) {
                             ser_bound.set_opt(ser);
                             de_bound.set_opt(de);
                         }
                     }
 
-                    _ => {
+                    MetaItem(ref meta_item) => {
                         cx.error(format!("unknown serde container attribute `{}`",
                                          meta_item.name()));
                     }
+
+                    Literal(_) => {
+                        cx.error(format!("unexpected literal in serde container attribute"));
+                    }
                 }
             }
         }
@@ -181,18 +187,22 @@ impl Item {
 #[derive(Debug)]
 pub struct Variant {
     name: Name,
+    skip_deserializing: bool,
+    skip_serializing: bool,
 }
 
 impl Variant {
     pub fn from_ast(cx: &Ctxt, variant: &syn::Variant) -> Self {
         let mut ser_name = Attr::none(cx, "rename");
         let mut de_name = Attr::none(cx, "rename");
+        let mut skip_deserializing = BoolAttr::none(cx, "skip_deserializing");
+        let mut skip_serializing = BoolAttr::none(cx, "skip_serializing");
 
         for meta_items in variant.attrs.iter().filter_map(get_serde_meta_items) {
             for meta_item in meta_items {
                 match meta_item {
                     // Parse `#[serde(rename="foo")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "rename" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "rename" => {
                         if let Ok(s) = get_string_from_lit(cx, name.as_ref(), name.as_ref(), lit) {
                             ser_name.set(s.clone());
                             de_name.set(s);
@@ -200,17 +210,29 @@ impl Variant {
                     }
 
                     // Parse `#[serde(rename(serialize="foo", deserialize="bar"))]`
-                    syn::MetaItem::List(ref name, ref meta_items) if name == "rename" => {
+                    MetaItem(List(ref name, ref meta_items)) if name == "rename" => {
                         if let Ok((ser, de)) = get_renames(cx, meta_items) {
                             ser_name.set_opt(ser);
                             de_name.set_opt(de);
                         }
                     }
+                    // Parse `#[serde(skip_deserializing)]`
+                    MetaItem(Word(ref name)) if name == "skip_deserializing" => {
+                        skip_deserializing.set_true();
+                    }
+                    // Parse `#[serde(skip_serializing)]`
+                    MetaItem(Word(ref name)) if name == "skip_serializing" => {
+                        skip_serializing.set_true();
+                    }
 
-                    _ => {
+                    MetaItem(ref meta_item) => {
                         cx.error(format!("unknown serde variant attribute `{}`",
                                          meta_item.name()));
                     }
+
+                    Literal(_) => {
+                        cx.error(format!("unexpected literal in serde variant attribute"));
+                    }
                 }
             }
         }
@@ -220,12 +242,22 @@ impl Variant {
                 serialize: ser_name.get().unwrap_or_else(|| variant.ident.to_string()),
                 deserialize: de_name.get().unwrap_or_else(|| variant.ident.to_string()),
             },
+            skip_deserializing: skip_deserializing.get(),
+            skip_serializing: skip_serializing.get(),
         }
     }
 
     pub fn name(&self) -> &Name {
         &self.name
     }
+
+    pub fn skip_deserializing(&self) -> bool {
+        self.skip_deserializing
+    }
+
+    pub fn skip_serializing(&self) -> bool {
+        self.skip_serializing
+    }
 }
 
 /// Represents field attribute information
@@ -278,7 +310,7 @@ impl Field {
             for meta_item in meta_items {
                 match meta_item {
                     // Parse `#[serde(rename="foo")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "rename" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "rename" => {
                         if let Ok(s) = get_string_from_lit(cx, name.as_ref(), name.as_ref(), lit) {
                             ser_name.set(s.clone());
                             de_name.set(s);
@@ -286,7 +318,7 @@ impl Field {
                     }
 
                     // Parse `#[serde(rename(serialize="foo", deserialize="bar"))]`
-                    syn::MetaItem::List(ref name, ref meta_items) if name == "rename" => {
+                    MetaItem(List(ref name, ref meta_items)) if name == "rename" => {
                         if let Ok((ser, de)) = get_renames(cx, meta_items) {
                             ser_name.set_opt(ser);
                             de_name.set_opt(de);
@@ -294,50 +326,50 @@ impl Field {
                     }
 
                     // Parse `#[serde(default)]`
-                    syn::MetaItem::Word(ref name) if name == "default" => {
+                    MetaItem(Word(ref name)) if name == "default" => {
                         default.set(FieldDefault::Default);
                     }
 
                     // Parse `#[serde(default="...")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "default" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "default" => {
                         if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
                             default.set(FieldDefault::Path(path));
                         }
                     }
 
                     // Parse `#[serde(skip_serializing)]`
-                    syn::MetaItem::Word(ref name) if name == "skip_serializing" => {
+                    MetaItem(Word(ref name)) if name == "skip_serializing" => {
                         skip_serializing.set_true();
                     }
 
                     // Parse `#[serde(skip_deserializing)]`
-                    syn::MetaItem::Word(ref name) if name == "skip_deserializing" => {
+                    MetaItem(Word(ref name)) if name == "skip_deserializing" => {
                         skip_deserializing.set_true();
                     }
 
                     // Parse `#[serde(skip_serializing_if="...")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "skip_serializing_if" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "skip_serializing_if" => {
                         if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
                             skip_serializing_if.set(path);
                         }
                     }
 
                     // Parse `#[serde(serialize_with="...")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "serialize_with" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "serialize_with" => {
                         if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
                             serialize_with.set(path);
                         }
                     }
 
                     // Parse `#[serde(deserialize_with="...")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "deserialize_with" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "deserialize_with" => {
                         if let Ok(path) = parse_lit_into_path(cx, name.as_ref(), lit) {
                             deserialize_with.set(path);
                         }
                     }
 
                     // Parse `#[serde(bound="D: Serialize")]`
-                    syn::MetaItem::NameValue(ref name, ref lit) if name == "bound" => {
+                    MetaItem(NameValue(ref name, ref lit)) if name == "bound" => {
                         if let Ok(where_predicates) = parse_lit_into_where(cx, name.as_ref(), name.as_ref(), lit) {
                             ser_bound.set(where_predicates.clone());
                             de_bound.set(where_predicates);
@@ -345,17 +377,21 @@ impl Field {
                     }
 
                     // Parse `#[serde(bound(serialize="D: Serialize", deserialize="D: Deserialize"))]`
-                    syn::MetaItem::List(ref name, ref meta_items) if name == "bound" => {
+                    MetaItem(List(ref name, ref meta_items)) if name == "bound" => {
                         if let Ok((ser, de)) = get_where_predicates(cx, meta_items) {
                             ser_bound.set_opt(ser);
                             de_bound.set_opt(de);
                         }
                     }
 
-                    _ => {
+                    MetaItem(ref meta_item) => {
                         cx.error(format!("unknown serde field attribute `{}`",
                                          meta_item.name()));
                     }
+
+                    Literal(_) => {
+                        cx.error(format!("unexpected literal in serde field attribute"));
+                    }
                 }
             }
         }
@@ -424,7 +460,7 @@ type SerAndDe<T> = (Option<T>, Option<T>);
 fn get_ser_and_de<T, F>(
     cx: &Ctxt,
     attr_name: &'static str,
-    items: &[syn::MetaItem],
+    items: &[syn::NestedMetaItem],
     f: F
 ) -> Result<SerAndDe<T>, ()>
     where F: Fn(&Ctxt, &str, &str, &syn::Lit) -> Result<T, ()>,
@@ -434,13 +470,13 @@ fn get_ser_and_de<T, F>(
 
     for item in items {
         match *item {
-            syn::MetaItem::NameValue(ref name, ref lit) if name == "serialize" => {
+            MetaItem(NameValue(ref name, ref lit)) if name == "serialize" => {
                 if let Ok(v) = f(cx, attr_name, name.as_ref(), lit) {
                     ser_item.set(v);
                 }
             }
 
-            syn::MetaItem::NameValue(ref name, ref lit) if name == "deserialize" => {
+            MetaItem(NameValue(ref name, ref lit)) if name == "deserialize" => {
                 if let Ok(v) = f(cx, attr_name, name.as_ref(), lit) {
                     de_item.set(v);
                 }
@@ -459,21 +495,21 @@ fn get_ser_and_de<T, F>(
 
 fn get_renames(
     cx: &Ctxt,
-    items: &[syn::MetaItem],
+    items: &[syn::NestedMetaItem],
 ) -> Result<SerAndDe<String>, ()> {
     get_ser_and_de(cx, "rename", items, get_string_from_lit)
 }
 
 fn get_where_predicates(
     cx: &Ctxt,
-    items: &[syn::MetaItem],
+    items: &[syn::NestedMetaItem],
 ) -> Result<SerAndDe<Vec<syn::WherePredicate>>, ()> {
     get_ser_and_de(cx, "bound", items, parse_lit_into_where)
 }
 
-pub fn get_serde_meta_items(attr: &syn::Attribute) -> Option<Vec<syn::MetaItem>> {
+pub fn get_serde_meta_items(attr: &syn::Attribute) -> Option<Vec<syn::NestedMetaItem>> {
     match attr.value {
-        syn::MetaItem::List(ref name, ref items) if name == "serde" => {
+        List(ref name, ref items) if name == "serde" => {
             Some(items.iter().cloned().collect())
         }
         _ => None

serde_derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_derive"
-version = "0.8.16"
+version = "0.9.1"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros 1.1 implementation of #[derive(Serialize, Deserialize)]"
@@ -10,21 +10,21 @@ documentation = "https://serde.rs/codegen.html"
 keywords = ["serde", "serialization"]
 include = ["Cargo.toml", "src/**/*.rs"]
 
+[badges]
+travis-ci = { repository = "serde-rs/serde" }
+
 [lib]
 name = "serde_derive"
 proc-macro = true
 
-[dependencies]
-post-expansion = "0.1.0"
-
 [dependencies.serde_codegen]
-version = "=0.8.16"
+version = "=0.9.0"
 path = "../serde_codegen"
 default-features = false
 features = ["with-syn"]
 
 [dev-dependencies]
-compiletest_rs = "^0.2.0"
+compiletest_rs = "0.2"
 fnv = "1.0"
-serde = { version = "0.8.16", path = "../serde" }
+serde = { version = "0.9", path = "../serde" }
-serde_test = { version = "0.8.16", path = "../serde_test" }
+serde_test = { version = "0.9", path = "../serde_test" }

serde_derive/no-std-tests/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "serde_derive_tests_no_std"
+version = "0.0.0"
+publish = false
+
+[dependencies]
+serde = { path = "../../serde", default-features = false }
+serde_derive = { path = ".." }

serde_derive/no-std-tests/src/main.rs

@@ -0,0 +1,50 @@
+#![feature(lang_items, start, libc)]
+#![no_std]
+
+extern crate libc;
+
+#[start]
+fn start(_argc: isize, _argv: *const *const u8) -> isize {
+    0
+}
+
+#[lang = "eh_personality"]
+#[no_mangle]
+pub extern fn rust_eh_personality() {}
+
+#[lang = "eh_unwind_resume"]
+#[no_mangle]
+pub extern fn rust_eh_unwind_resume() {}
+
+#[lang = "panic_fmt"]
+#[no_mangle]
+pub extern fn rust_begin_panic(_msg: core::fmt::Arguments,
+                               _file: &'static str,
+                               _line: u32) -> ! {
+    loop {}
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+#[macro_use]
+extern crate serde_derive;
+
+#[derive(Serialize, Deserialize)]
+struct Unit;
+
+#[derive(Serialize, Deserialize)]
+struct Newtype(u8);
+
+#[derive(Serialize, Deserialize)]
+struct Tuple(u8, u8);
+
+#[derive(Serialize, Deserialize)]
+struct Struct { f: u8 }
+
+#[derive(Serialize, Deserialize)]
+enum Enum {
+    Unit,
+    Newtype(u8),
+    Tuple(u8, u8),
+    Struct { f: u8 },
+}

serde_derive/src/lib.rs

@@ -1,30 +1,20 @@
-#![feature(proc_macro, proc_macro_lib)]
-#![cfg(not(test))]
-
 extern crate proc_macro;
 extern crate serde_codegen;
 
-#[macro_use]
-extern crate post_expansion;
-
 use proc_macro::TokenStream;
 
-#[proc_macro_derive(Serialize)]
+#[proc_macro_derive(Serialize, attributes(serde))]
 pub fn derive_serialize(input: TokenStream) -> TokenStream {
-    let item = format!("#[derive(Serialize)]\n{}", input);
+    match serde_codegen::expand_derive_serialize(&input.to_string()) {
-    match serde_codegen::expand_single_item(&item) {
         Ok(expanded) => expanded.parse().unwrap(),
         Err(msg) => panic!(msg),
     }
 }
 
-#[proc_macro_derive(Deserialize)]
+#[proc_macro_derive(Deserialize, attributes(serde))]
 pub fn derive_deserialize(input: TokenStream) -> TokenStream {
-    let item = format!("#[derive(Deserialize)]\n{}", input);
+    match serde_codegen::expand_derive_deserialize(&input.to_string()) {
-    match serde_codegen::expand_single_item(&item) {
         Ok(expanded) => expanded.parse().unwrap(),
         Err(msg) => panic!(msg),
     }
 }
-
-register_post_expansion!(PostExpansion_serde);

serde_derive/tests/compile-fail/duplicate-attribute/rename-and-ser.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/duplicate-attribute/rename-rename-de.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/duplicate-attribute/rename-ser-rename-ser.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/duplicate-attribute/rename-ser-rename.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/duplicate-attribute/rename-ser-ser.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/duplicate-attribute/two-rename-ser.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/str_ref_deser.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/unknown-attribute/container.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/unknown-attribute/field.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/compile-fail/unknown-attribute/variant.rs

@@ -1,5 +1,3 @@
-#![feature(proc_macro)]
-
 #[macro_use]
 extern crate serde_derive;
 

serde_derive/tests/run-pass/identity-op.rs

@@ -1,4 +1,3 @@
-#![feature(proc_macro)]
 #![deny(identity_op)]
 
 #[macro_use]

serde_derive/tests/test.rs

@@ -1,4 +1,4 @@
-#![feature(test, proc_macro)]
+#![feature(test)]
 
 #[macro_use]
 extern crate serde_derive;

serde_test/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_test"
-version = "0.8.16"
+version = "0.9.1"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Token De/Serializer for testing De/Serialize implementations"
@@ -12,4 +12,7 @@ keywords = ["serde", "serialization"]
 include = ["Cargo.toml", "src/**/*.rs"]
 
 [dependencies]
-serde = { version = "0.8.16", path = "../serde" }
+serde = { version = "0.9", path = "../serde" }
+
+[badges]
+travis-ci = { repository = "serde-rs/serde" }

serde_test/src/de.rs

@@ -3,12 +3,14 @@ use std::iter;
 use serde::de::{
     self,
     Deserialize,
+    DeserializeSeed,
     EnumVisitor,
     MapVisitor,
     SeqVisitor,
     VariantVisitor,
     Visitor,
 };
+use serde::de::value::ValueDeserializer;
 
 use error::Error;
 use token::Token;
@@ -32,184 +34,207 @@ impl<I> Deserializer<I>
         self.tokens.next()
     }
 
-    fn visit_seq<V>(&mut self, len: Option<usize>, mut visitor: V) -> Result<V::Value, Error>
+    pub fn expect_token(&mut self, expected: Token) -> Result<(), Error> {
-        where V: Visitor,
+        match self.tokens.next() {
-    {
+            Some(token) => {
-        visitor.visit_seq(DeserializerSeqVisitor {
+                if expected == token {
-            de: self,
+                    Ok(())
-            len: len,
+                } else {
-        })
+                    Err(Error::UnexpectedToken(token))
+                }
+            }
+            None => Err(Error::EndOfTokens),
+        }
     }
 
-    fn visit_array<V>(&mut self, len: usize, mut visitor: V) -> Result<V::Value, Error>
+    fn visit_seq<V>(&mut self, len: Option<usize>, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
-        visitor.visit_seq(DeserializerArrayVisitor {
+        let value = try!(visitor.visit_seq(DeserializerSeqVisitor {
             de: self,
             len: len,
-        })
+        }));
+        try!(self.expect_token(Token::SeqEnd));
+        Ok(value)
     }
 
-    fn visit_tuple<V>(&mut self, len: usize, mut visitor: V) -> Result<V::Value, Error>
+    fn visit_array<V>(&mut self, len: usize, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
-        visitor.visit_seq(DeserializerTupleVisitor {
+        let value = try!(visitor.visit_seq(DeserializerArrayVisitor {
             de: self,
             len: len,
-        })
+        }));
+        try!(self.expect_token(Token::SeqEnd));
+        Ok(value)
     }
 
-    fn visit_tuple_struct<V>(&mut self, len: usize, mut visitor: V) -> Result<V::Value, Error>
+    fn visit_tuple<V>(&mut self, len: usize, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
-        visitor.visit_seq(DeserializerTupleStructVisitor {
+        let value = try!(visitor.visit_seq(DeserializerTupleVisitor {
             de: self,
             len: len,
-        })
+        }));
+        try!(self.expect_token(Token::TupleEnd));
+        Ok(value)
     }
 
-    fn visit_variant_seq<V>(&mut self, len: Option<usize>, mut visitor: V) -> Result<V::Value, Error>
+    fn visit_tuple_struct<V>(&mut self, len: usize, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
-        visitor.visit_seq(DeserializerVariantSeqVisitor {
+        let value = try!(visitor.visit_seq(DeserializerTupleStructVisitor {
             de: self,
             len: len,
-        })
+        }));
+        try!(self.expect_token(Token::TupleStructEnd));
+        Ok(value)
     }
 
-    fn visit_map<V>(&mut self, len: Option<usize>, mut visitor: V) -> Result<V::Value, Error>
+    fn visit_variant_seq<V>(&mut self, len: Option<usize>, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
-        visitor.visit_map(DeserializerMapVisitor {
+        let value = try!(visitor.visit_seq(DeserializerVariantSeqVisitor {
             de: self,
             len: len,
-        })
+        }));
+        try!(self.expect_token(Token::EnumSeqEnd));
+        Ok(value)
     }
 
-    fn visit_struct<V>(&mut self, len: Option<usize>, mut visitor: V) -> Result<V::Value, Error>
+    fn visit_map<V>(&mut self, len: Option<usize>, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
-        visitor.visit_map(DeserializerStructVisitor {
+        let value = try!(visitor.visit_map(DeserializerMapVisitor {
             de: self,
             len: len,
-        })
+        }));
+        try!(self.expect_token(Token::MapEnd));
+        Ok(value)
     }
 
-    fn visit_variant_map<V>(&mut self, len: Option<usize>, mut visitor: V) -> Result<V::Value, Error>
+    fn visit_struct<V>(&mut self, fields: &'static [&'static str], visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
-        visitor.visit_map(DeserializerVariantMapVisitor {
+        let value = try!(visitor.visit_map(DeserializerStructVisitor {
+            de: self,
+            len: fields.len(),
+        }));
+        try!(self.expect_token(Token::StructEnd));
+        Ok(value)
+    }
+
+    fn visit_variant_map<V>(&mut self, len: Option<usize>, visitor: V) -> Result<V::Value, Error>
+        where V: Visitor,
+    {
+        let value = try!(visitor.visit_map(DeserializerVariantMapVisitor {
             de: self,
             len: len,
-        })
+        }));
+        try!(self.expect_token(Token::EnumMapEnd));
+        Ok(value)
     }
 }
 
-impl<I> de::Deserializer for Deserializer<I>
+impl<'a, I> de::Deserializer for &'a mut Deserializer<I>
     where I: Iterator<Item=Token<'static>>,
 {
     type Error = Error;
 
-    fn deserialize_seq<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_seq<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_struct_field<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_struct_field<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_map<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_map<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_unit<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_unit<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_bytes<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_bytes<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_ignored_any<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_byte_buf<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_string<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_ignored_any<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_str<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_string<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_char<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_str<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_i64<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_char<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_i32<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_i64<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_i16<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_i32<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_i8<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_i16<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_u64<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_i8<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_u32<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_u64<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_u16<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_u32<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_u8<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_u16<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_f32<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_u8<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_f64<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_f32<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_bool<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_f64<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
-    fn deserialize_usize<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
+    fn deserialize_bool<__V>(self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_isize<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
         where __V: de::Visitor {
         self.deserialize(visitor)
     }
 
-    fn deserialize<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
+    fn deserialize<V>(self, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
         match self.tokens.next() {
             Some(Token::Bool(v)) => visitor.visit_bool(v),
-            Some(Token::Isize(v)) => visitor.visit_isize(v),
             Some(Token::I8(v)) => visitor.visit_i8(v),
             Some(Token::I16(v)) => visitor.visit_i16(v),
             Some(Token::I32(v)) => visitor.visit_i32(v),
             Some(Token::I64(v)) => visitor.visit_i64(v),
-            Some(Token::Usize(v)) => visitor.visit_usize(v),
             Some(Token::U8(v)) => visitor.visit_u8(v),
             Some(Token::U16(v)) => visitor.visit_u16(v),
             Some(Token::U32(v)) => visitor.visit_u32(v),
@@ -220,10 +245,11 @@ impl<I> de::Deserializer for Deserializer<I>
             Some(Token::Str(v)) => visitor.visit_str(v),
             Some(Token::String(v)) => visitor.visit_string(v),
             Some(Token::Bytes(v)) => visitor.visit_bytes(v),
+            Some(Token::ByteBuf(v)) => visitor.visit_byte_buf(v),
             Some(Token::Option(false)) => visitor.visit_none(),
             Some(Token::Option(true)) => visitor.visit_some(self),
             Some(Token::Unit) => visitor.visit_unit(),
-            Some(Token::UnitStruct(name)) => visitor.visit_unit_struct(name),
+            Some(Token::UnitStruct(_name)) => visitor.visit_unit(),
             Some(Token::SeqStart(len)) => {
                 self.visit_seq(len, visitor)
             }
@@ -237,13 +263,13 @@ impl<I> de::Deserializer for Deserializer<I>
                 self.visit_map(Some(len), visitor)
             }
             Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
     /// Hook into `Option` deserializing so we can treat `Unit` as a
     /// `None`, or a regular value as `Some(value)`.
-    fn deserialize_option<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
+    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
         match self.tokens.peek() {
@@ -260,21 +286,21 @@ impl<I> de::Deserializer for Deserializer<I>
                 visitor.visit_none()
             }
             Some(_) => visitor.visit_some(self),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn deserialize_enum<V>(&mut self,
+    fn deserialize_enum<V>(self,
                      name: &str,
                      _variants: &'static [&'static str],
-                     mut visitor: V) -> Result<V::Value, Error>
+                     visitor: V) -> Result<V::Value, Error>
-        where V: EnumVisitor,
+        where V: Visitor,
     {
         match self.tokens.peek() {
             Some(&Token::EnumStart(n)) if name == n => {
                 self.tokens.next();
 
-                visitor.visit(DeserializerVariantVisitor {
+                visitor.visit_enum(DeserializerEnumVisitor {
                     de: self,
                 })
             }
@@ -282,7 +308,7 @@ impl<I> de::Deserializer for Deserializer<I>
             | Some(&Token::EnumNewType(n, _))
             | Some(&Token::EnumSeqStart(n, _, _))
             | Some(&Token::EnumMapStart(n, _, _)) if name == n => {
-                visitor.visit(DeserializerVariantVisitor {
+                visitor.visit_enum(DeserializerEnumVisitor {
                     de: self,
                 })
             }
@@ -290,11 +316,11 @@ impl<I> de::Deserializer for Deserializer<I>
                 let token = self.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => { return Err(Error::EndOfStream); }
+            None => { return Err(Error::EndOfTokens); }
         }
     }
 
-    fn deserialize_unit_struct<V>(&mut self, name: &str, mut visitor: V) -> Result<V::Value, Error>
+    fn deserialize_unit_struct<V>(self, name: &str, visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
         match self.tokens.peek() {
@@ -307,13 +333,13 @@ impl<I> de::Deserializer for Deserializer<I>
                 }
             }
             Some(_) => self.deserialize(visitor),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn deserialize_newtype_struct<V>(&mut self,
+    fn deserialize_newtype_struct<V>(self,
                                      name: &str,
-                                     mut visitor: V) -> Result<V::Value, Error>
+                                     visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
         match self.tokens.peek() {
@@ -326,11 +352,11 @@ impl<I> de::Deserializer for Deserializer<I>
                 }
             }
             Some(_) => self.deserialize(visitor),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn deserialize_seq_fixed_size<V>(&mut self,
+    fn deserialize_seq_fixed_size<V>(self,
                                        len: usize,
                                        visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
@@ -341,13 +367,13 @@ impl<I> de::Deserializer for Deserializer<I>
                 self.visit_array(len, visitor)
             }
             Some(_) => self.deserialize(visitor),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn deserialize_tuple<V>(&mut self,
+    fn deserialize_tuple<V>(self,
                             len: usize,
-                            mut visitor: V) -> Result<V::Value, Error>
+                            visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
         match self.tokens.peek() {
@@ -376,14 +402,14 @@ impl<I> de::Deserializer for Deserializer<I>
                 self.visit_tuple_struct(len, visitor)
             }
             Some(_) => self.deserialize(visitor),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn deserialize_tuple_struct<V>(&mut self,
+    fn deserialize_tuple_struct<V>(self,
                                    name: &str,
                                    len: usize,
-                                   mut visitor: V) -> Result<V::Value, Error>
+                                   visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
     {
         match self.tokens.peek() {
@@ -420,11 +446,11 @@ impl<I> de::Deserializer for Deserializer<I>
                 }
             }
             Some(_) => self.deserialize(visitor),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn deserialize_struct<V>(&mut self,
+    fn deserialize_struct<V>(self,
                              name: &str,
                              fields: &'static [&'static str],
                              visitor: V) -> Result<V::Value, Error>
@@ -434,7 +460,7 @@ impl<I> de::Deserializer for Deserializer<I>
             Some(&Token::StructStart(n, _)) => {
                 self.tokens.next();
                 if name == n {
-                    self.visit_struct(Some(fields.len()), visitor)
+                    self.visit_struct(fields, visitor)
                 } else {
                     Err(Error::InvalidName(n))
                 }
@@ -444,7 +470,7 @@ impl<I> de::Deserializer for Deserializer<I>
                 self.visit_map(Some(fields.len()), visitor)
             }
             Some(_) => self.deserialize(visitor),
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 }
@@ -461,30 +487,21 @@ impl<'a, I> SeqVisitor for DeserializerSeqVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit<T>(&mut self) -> Result<Option<T>, Error>
+    fn visit_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
-        where T: Deserialize,
+        where T: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::SeqSep) => {
                 self.de.tokens.next();
                 self.len = self.len.map(|len| len - 1);
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::SeqEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
-        }
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        //assert_eq!(self.len.unwrap_or(0), 0);
-        match self.de.tokens.next() {
-            Some(Token::SeqEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
         }
     }
 
@@ -506,30 +523,21 @@ impl<'a, I> SeqVisitor for DeserializerArrayVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit<T>(&mut self) -> Result<Option<T>, Error>
+    fn visit_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
-        where T: Deserialize,
+        where T: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::SeqSep) => {
                 self.de.tokens.next();
                 self.len -= 1;
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::SeqEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
-        }
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        assert_eq!(self.len, 0);
-        match self.de.tokens.next() {
-            Some(Token::SeqEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
         }
     }
 
@@ -550,30 +558,21 @@ impl<'a, I> SeqVisitor for DeserializerTupleVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit<T>(&mut self) -> Result<Option<T>, Error>
+    fn visit_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
-        where T: Deserialize,
+        where T: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::TupleSep) => {
                 self.de.tokens.next();
                 self.len -= 1;
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::TupleEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
-        }
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        assert_eq!(self.len, 0);
-        match self.de.tokens.next() {
-            Some(Token::TupleEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
         }
     }
 
@@ -594,30 +593,21 @@ impl<'a, I> SeqVisitor for DeserializerTupleStructVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit<T>(&mut self) -> Result<Option<T>, Error>
+    fn visit_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
-        where T: Deserialize,
+        where T: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::TupleStructSep) => {
                 self.de.tokens.next();
                 self.len -= 1;
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::TupleStructEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
-        }
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        assert_eq!(self.len, 0);
-        match self.de.tokens.next() {
-            Some(Token::TupleStructEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
         }
     }
 
@@ -638,30 +628,21 @@ impl<'a, I> SeqVisitor for DeserializerVariantSeqVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit<T>(&mut self) -> Result<Option<T>, Error>
+    fn visit_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Error>
-        where T: Deserialize,
+        where T: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::EnumSeqSep) => {
                 self.de.tokens.next();
                 self.len = self.len.map(|len| len - 1);
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::EnumSeqEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
-        }
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        //assert_eq!(self.len.unwrap_or(0), 0);
-        match self.de.tokens.next() {
-            Some(Token::EnumSeqEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
         }
     }
 
@@ -683,37 +664,28 @@ impl<'a, I> MapVisitor for DeserializerMapVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit_key<K>(&mut self) -> Result<Option<K>, Error>
+    fn visit_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
-        where K: Deserialize,
+        where K: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::MapSep) => {
                 self.de.tokens.next();
                 self.len = self.len.map(|len| if len > 0 { len - 1} else { 0 });
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::MapEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn visit_value<V>(&mut self) -> Result<V, Error>
+    fn visit_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
-        where V: Deserialize,
+        where V: DeserializeSeed,
     {
-        Ok(try!(Deserialize::deserialize(self.de)))
+        seed.deserialize(&mut *self.de)
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        //assert_eq!(self.len.unwrap_or(0), 0);
-        match self.de.tokens.next() {
-            Some(Token::MapEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
-        }
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
@@ -726,7 +698,7 @@ impl<'a, I> MapVisitor for DeserializerMapVisitor<'a, I>
 
 struct DeserializerStructVisitor<'a, I: 'a> where I: Iterator<Item=Token<'static>> {
     de: &'a mut Deserializer<I>,
-    len: Option<usize>,
+    len: usize,
 }
 
 impl<'a, I> MapVisitor for DeserializerStructVisitor<'a, I>
@@ -734,76 +706,74 @@ impl<'a, I> MapVisitor for DeserializerStructVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit_key<K>(&mut self) -> Result<Option<K>, Error>
+    fn visit_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
-        where K: Deserialize,
+        where K: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::StructSep) => {
                 self.de.tokens.next();
-                self.len = self.len.map(|len| if len > 0 { len - 1} else { 0 });
+                self.len = self.len.saturating_sub(1);
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::StructEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn visit_value<V>(&mut self) -> Result<V, Error>
+    fn visit_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
-        where V: Deserialize,
+        where V: DeserializeSeed,
     {
-        Ok(try!(Deserialize::deserialize(self.de)))
+        seed.deserialize(&mut *self.de)
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        //assert_eq!(self.len.unwrap_or(0), 0);
-        match self.de.tokens.next() {
-            Some(Token::StructEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
-        }
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {
-        let len = self.len.unwrap_or(0);
+        (self.len, Some(self.len))
-        (len, self.len)
     }
 }
 
 //////////////////////////////////////////////////////////////////////////
 
-struct DeserializerVariantVisitor<'a, I: 'a> where I: Iterator<Item=Token<'static>> {
+struct DeserializerEnumVisitor<'a, I: 'a> where I: Iterator<Item=Token<'static>> {
     de: &'a mut Deserializer<I>,
 }
 
-impl<'a, I> VariantVisitor for DeserializerVariantVisitor<'a, I>
+impl<'a, I> EnumVisitor for DeserializerEnumVisitor<'a, I>
     where I: Iterator<Item=Token<'static>>,
 {
     type Error = Error;
+    type Variant = Self;
 
-    fn visit_variant<V>(&mut self) -> Result<V, Error>
+    fn visit_variant_seed<V>(self, seed: V) -> Result<(V::Value, Self), Error>
-        where V: Deserialize,
+        where V: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::EnumUnit(_, v))
             | Some(&Token::EnumNewType(_, v))
             | Some(&Token::EnumSeqStart(_, v, _))
             | Some(&Token::EnumMapStart(_, v, _)) => {
-                let mut de = de::value::ValueDeserializer::<Error>::into_deserializer(v);
+                let de = v.into_deserializer();
-                let value = try!(Deserialize::deserialize(&mut de));
+                let value = try!(seed.deserialize(de));
-                Ok(value)
+                Ok((value, self))
             }
             Some(_) => {
-                Deserialize::deserialize(self.de)
+                let value = try!(seed.deserialize(&mut *self.de));
+                Ok((value, self))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
+}
 
-    fn visit_unit(&mut self) -> Result<(), Error> {
+impl<'a, I> VariantVisitor for DeserializerEnumVisitor<'a, I>
+    where I: Iterator<Item=Token<'static>>
+{
+    type Error = Error;
+
+    fn visit_unit(self) -> Result<(), Error> {
         match self.de.tokens.peek() {
             Some(&Token::EnumUnit(_, _)) => {
                 self.de.tokens.next();
@@ -812,26 +782,26 @@ impl<'a, I> VariantVisitor for DeserializerVariantVisitor<'a, I>
             Some(_) => {
                 Deserialize::deserialize(self.de)
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn visit_newtype<T>(&mut self) -> Result<T, Self::Error>
+    fn visit_newtype_seed<T>(self, seed: T) -> Result<T::Value, Self::Error>
-        where T: Deserialize,
+        where T: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::EnumNewType(_, _)) => {
                 self.de.tokens.next();
-                Deserialize::deserialize(self.de)
+                seed.deserialize(self.de)
             }
             Some(_) => {
-                Deserialize::deserialize(self.de)
+                seed.deserialize(self.de)
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn visit_tuple<V>(&mut self,
+    fn visit_tuple<V>(self,
                       len: usize,
                       visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
@@ -856,13 +826,13 @@ impl<'a, I> VariantVisitor for DeserializerVariantVisitor<'a, I>
                 }
             }
             Some(_) => {
-                Deserialize::deserialize(self.de)
+                de::Deserializer::deserialize(self.de, visitor)
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn visit_struct<V>(&mut self,
+    fn visit_struct<V>(self,
                        fields: &'static [&'static str],
                        visitor: V) -> Result<V::Value, Error>
         where V: Visitor,
@@ -887,9 +857,9 @@ impl<'a, I> VariantVisitor for DeserializerVariantVisitor<'a, I>
                 }
             }
             Some(_) => {
-                Deserialize::deserialize(self.de)
+                de::Deserializer::deserialize(self.de, visitor)
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 }
@@ -906,37 +876,28 @@ impl<'a, I> MapVisitor for DeserializerVariantMapVisitor<'a, I>
 {
     type Error = Error;
 
-    fn visit_key<K>(&mut self) -> Result<Option<K>, Error>
+    fn visit_key_seed<K>(&mut self, seed: K) -> Result<Option<K::Value>, Error>
-        where K: Deserialize,
+        where K: DeserializeSeed,
     {
         match self.de.tokens.peek() {
             Some(&Token::EnumMapSep) => {
                 self.de.tokens.next();
                 self.len = self.len.map(|len| if len > 0 { len - 1} else { 0 });
-                Ok(Some(try!(Deserialize::deserialize(self.de))))
+                seed.deserialize(&mut *self.de).map(Some)
             }
             Some(&Token::EnumMapEnd) => Ok(None),
             Some(_) => {
                 let token = self.de.tokens.next().unwrap();
                 Err(Error::UnexpectedToken(token))
             }
-            None => Err(Error::EndOfStream),
+            None => Err(Error::EndOfTokens),
         }
     }
 
-    fn visit_value<V>(&mut self) -> Result<V, Error>
+    fn visit_value_seed<V>(&mut self, seed: V) -> Result<V::Value, Error>
-        where V: Deserialize,
+        where V: DeserializeSeed,
     {
-        Ok(try!(Deserialize::deserialize(self.de)))
+        seed.deserialize(&mut *self.de)
-    }
-
-    fn end(&mut self) -> Result<(), Error> {
-        //assert_eq!(self.len.unwrap_or(0), 0);
-        match self.de.tokens.next() {
-            Some(Token::EnumMapEnd) => Ok(()),
-            Some(token) => Err(Error::UnexpectedToken(token)),
-            None => Err(Error::EndOfStream),
-        }
     }
 
     fn size_hint(&self) -> (usize, Option<usize>) {

serde_test/src/error.rs

@@ -1,4 +1,5 @@
-use std::{error, fmt};
+use std::error;
+use std::fmt::{self, Display};
 
 use serde::{ser, de};
 
@@ -6,82 +7,42 @@ use token::Token;
 
 #[derive(Clone, PartialEq, Debug)]
 pub enum Error {
-    // Shared
+    Message(String),
-    Custom(String),
-    InvalidValue(String),
-
-    // De
-    EndOfStream,
-    InvalidType(de::Type),
-    InvalidLength(usize),
-    UnknownVariant(String),
-    UnknownField(String),
-    MissingField(&'static str),
-    DuplicateField(&'static str),
     InvalidName(&'static str),
     UnexpectedToken(Token<'static>),
+    EndOfTokens,
 }
 
 impl ser::Error for Error {
-    fn custom<T: Into<String>>(msg: T) -> Error {
+    fn custom<T: Display>(msg: T) -> Error {
-        Error::Custom(msg.into())
+        Error::Message(msg.to_string())
-    }
-
-    fn invalid_value(msg: &str) -> Error {
-        Error::InvalidValue(msg.to_owned())
     }
 }
 
 impl de::Error for Error {
-    fn custom<T: Into<String>>(msg: T) -> Error {
+    fn custom<T: Display>(msg: T) -> Error {
-        Error::Custom(msg.into())
+        Error::Message(msg.to_string())
-    }
-
-    fn end_of_stream() -> Error {
-        Error::EndOfStream
-    }
-
-    fn invalid_type(ty: de::Type) -> Error {
-        Error::InvalidType(ty)
-    }
-
-    fn invalid_value(msg: &str) -> Error {
-        Error::InvalidValue(msg.to_owned())
-    }
-
-    fn invalid_length(len: usize) -> Error {
-        Error::InvalidLength(len)
-    }
-
-    fn unknown_variant(variant: &str) -> Error {
-        Error::UnknownVariant(variant.to_owned())
-    }
-
-    fn unknown_field(field: &str) -> Error {
-        Error::UnknownField(field.to_owned())
-    }
-
-    fn missing_field(field: &'static str) -> Error {
-        Error::MissingField(field)
-    }
-
-    fn duplicate_field(field: &'static str) -> Error {
-        Error::DuplicateField(field)
     }
 }
 
 impl fmt::Display for Error {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        formatter.write_str(format!("{:?}", self).as_ref())
+        match *self {
+            Error::Message(ref msg) => formatter.write_str(msg),
+            Error::InvalidName(name) => write!(formatter, "invalid name `{}`", name),
+            Error::UnexpectedToken(_) => formatter.write_str("unexpected token"),
+            Error::EndOfTokens => formatter.write_str("end of tokens"),
+        }
     }
 }
 
 impl error::Error for Error {
     fn description(&self) -> &str {
-        "Serde Error"
+        match *self {
-    }
+            Error::Message(ref msg) => msg,
-
+            Error::InvalidName(_) => "invalid name",
-    fn cause(&self) -> Option<&error::Error> {
+            Error::UnexpectedToken(_) => "unexpected token",
-        None
+            Error::EndOfTokens => "end of tokens",
+        }
     }
 }

serde_test/src/ser.rs

@@ -1,9 +1,6 @@
 use std::marker::PhantomData;
 
-use serde::ser::{
+use serde::{ser, Serialize};
-    self,
-    Serialize,
-};
 
 use error::Error;
 use token::Token;
@@ -30,294 +27,320 @@ impl<'a, I> Serializer<'a, I>
     }
 }
 
-impl<'a, I> ser::Serializer for Serializer<'a, I>
+impl<'s, 'a, I> ser::Serializer for &'s mut Serializer<'a, I>
     where I: Iterator<Item=&'a Token<'a>>,
 {
+    type Ok = ();
     type Error = Error;
-    type MapState = ();
-    type SeqState = ();
-    type TupleState = ();
-    type TupleStructState = ();
-    type TupleVariantState = ();
-    type StructState = ();
-    type StructVariantState = ();
 
-    fn serialize_unit(&mut self) -> Result<(), Error> {
+    type SerializeSeq = Self;
-        assert_eq!(self.tokens.next(), Some(&Token::Unit));
+    type SerializeTuple = Self;
-        Ok(())
+    type SerializeTupleStruct = Self;
-    }
+    type SerializeTupleVariant = Self;
+    type SerializeMap = Self;
+    type SerializeStruct = Self;
+    type SerializeStructVariant = Self;
 
-    fn serialize_newtype_variant<T>(&mut self,
+    fn serialize_bool(self, v: bool) -> Result<(), Error> {
-                                name: &str,
-                                _variant_index: usize,
-                                variant: &str,
-                                value: T) -> Result<(), Error>
-        where T: Serialize,
-    {
-        assert_eq!(self.tokens.next(), Some(&Token::EnumNewType(name, variant)));
-        value.serialize(self)
-    }
-
-    fn serialize_unit_struct(&mut self, name: &str) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::UnitStruct(name)));
-        Ok(())
-    }
-
-    fn serialize_unit_variant(&mut self,
-                          name: &str,
-                          _variant_index: usize,
-                          variant: &str) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::EnumUnit(name, variant)));
-
-        Ok(())
-    }
-
-    fn serialize_bool(&mut self, v: bool) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::Bool(v)));
         Ok(())
     }
 
-    fn serialize_isize(&mut self, v: isize) -> Result<(), Error> {
+    fn serialize_i8(self, v: i8) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::Isize(v)));
-        Ok(())
-    }
-
-    fn serialize_i8(&mut self, v: i8) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::I8(v)));
         Ok(())
     }
 
-    fn serialize_i16(&mut self, v: i16) -> Result<(), Error> {
+    fn serialize_i16(self, v: i16) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::I16(v)));
         Ok(())
     }
 
-    fn serialize_i32(&mut self, v: i32) -> Result<(), Error> {
+    fn serialize_i32(self, v: i32) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::I32(v)));
         Ok(())
     }
 
-    fn serialize_i64(&mut self, v: i64) -> Result<(), Error> {
+    fn serialize_i64(self, v: i64) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::I64(v)));
         Ok(())
     }
 
-    fn serialize_usize(&mut self, v: usize) -> Result<(), Error> {
+    fn serialize_u8(self, v: u8) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::Usize(v)));
-        Ok(())
-    }
-
-    fn serialize_u8(&mut self, v: u8) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::U8(v)));
         Ok(())
     }
 
-    fn serialize_u16(&mut self, v: u16) -> Result<(), Error> {
+    fn serialize_u16(self, v: u16) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::U16(v)));
         Ok(())
     }
 
-    fn serialize_u32(&mut self, v: u32) -> Result<(), Error> {
+    fn serialize_u32(self, v: u32) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::U32(v)));
         Ok(())
     }
 
-    fn serialize_u64(&mut self, v: u64) -> Result<(), Error> {
+    fn serialize_u64(self, v: u64) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::U64(v)));
         Ok(())
     }
 
-    fn serialize_f32(&mut self, v: f32) -> Result<(), Error> {
+    fn serialize_f32(self, v: f32) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::F32(v)));
         Ok(())
     }
 
-    fn serialize_f64(&mut self, v: f64) -> Result<(), Error> {
+    fn serialize_f64(self, v: f64) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::F64(v)));
         Ok(())
     }
 
-    fn serialize_char(&mut self, v: char) -> Result<(), Error> {
+    fn serialize_char(self, v: char) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::Char(v)));
         Ok(())
     }
 
-    fn serialize_str(&mut self, v: &str) -> Result<(), Error> {
+    fn serialize_str(self, v: &str) -> Result<(), Error> {
         assert_eq!(self.tokens.next(), Some(&Token::Str(v)));
         Ok(())
     }
 
-    fn serialize_none(&mut self) -> Result<(), Error> {
+    fn serialize_bytes(self, value: &[u8]) -> Result<(), Self::Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::Option(false)));
+        assert_eq!(self.tokens.next(), Some(&Token::Bytes(value)));
         Ok(())
     }
 
-    fn serialize_some<V>(&mut self, value: V) -> Result<(), Error>
+    fn serialize_unit(self) -> Result<(), Error> {
-        where V: Serialize,
+        assert_eq!(self.tokens.next(), Some(&Token::Unit));
-    {
-        assert_eq!(self.tokens.next(), Some(&Token::Option(true)));
-        value.serialize(self)
-    }
-
-    fn serialize_seq<'b>(&'b mut self, len: Option<usize>) -> Result<(), Error>
-    {
-        assert_eq!(self.tokens.next(), Some(&Token::SeqStart(len)));
         Ok(())
     }
 
-    fn serialize_seq_elt<T>(&mut self, _: &mut (), value: T) -> Result<(), Error>
+    fn serialize_unit_struct(self, name: &str) -> Result<(), Error> {
-        where T: Serialize
+        assert_eq!(self.tokens.next(), Some(&Token::UnitStruct(name)));
-    {
-        assert_eq!(self.tokens.next(), Some(&Token::SeqSep));
-        value.serialize(self)
-    }
-
-    fn serialize_seq_end(&mut self, _: ()) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::SeqEnd));
         Ok(())
     }
 
-    fn serialize_seq_fixed_size(&mut self, len: usize) -> Result<(), Error>
+    fn serialize_unit_variant(self,
-    {
+                              name: &str,
-        assert_eq!(self.tokens.next(), Some(&Token::SeqArrayStart(len)));
+                              _variant_index: usize,
+                              variant: &str) -> Result<(), Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::EnumUnit(name, variant)));
         Ok(())
     }
 
-    fn serialize_tuple(&mut self, len: usize) -> Result<(), Error>
+    fn serialize_newtype_struct<T: ?Sized>(self,
-    {
+                                           name: &'static str,
-        assert_eq!(self.tokens.next(), Some(&Token::TupleStart(len)));
+                                           value: &T) -> Result<(), Error>
-        Ok(())
-    }
-
-    fn serialize_tuple_elt<T>(&mut self, _: &mut (), value: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        assert_eq!(self.tokens.next(), Some(&Token::TupleSep));
-        value.serialize(self)
-    }
-
-    fn serialize_tuple_end(&mut self, _: ()) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::TupleEnd));
-        Ok(())
-    }
-
-    fn serialize_newtype_struct<T>(&mut self,
-                                   name: &'static str,
-                                   value: T) -> Result<(), Error>
         where T: Serialize,
     {
         assert_eq!(self.tokens.next(), Some(&Token::StructNewType(name)));
         value.serialize(self)
     }
 
-    fn serialize_tuple_struct(&mut self, name: &'static str, len: usize) -> Result<(), Error>
+    fn serialize_newtype_variant<T: ?Sized>(self,
+                                            name: &str,
+                                            _variant_index: usize,
+                                            variant: &str,
+                                            value: &T) -> Result<(), Error>
+        where T: Serialize,
     {
-        assert_eq!(self.tokens.next(), Some(&Token::TupleStructStart(name, len)));
+        assert_eq!(self.tokens.next(), Some(&Token::EnumNewType(name, variant)));
-
-        Ok(())
-    }
-
-    fn serialize_tuple_struct_elt<T>(&mut self, _: &mut (), value: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        assert_eq!(self.tokens.next(), Some(&Token::TupleStructSep));
         value.serialize(self)
     }
 
-    fn serialize_tuple_struct_end(&mut self, _: ()) -> Result<(), Error> {
+    fn serialize_none(self) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::TupleStructEnd));
+        assert_eq!(self.tokens.next(), Some(&Token::Option(false)));
         Ok(())
     }
 
-    fn serialize_tuple_variant(&mut self,
+    fn serialize_some<T: ?Sized>(self, value: &T) -> Result<(), Error>
+        where T: Serialize,
+    {
+        assert_eq!(self.tokens.next(), Some(&Token::Option(true)));
+        value.serialize(self)
+    }
+
+    fn serialize_seq(self, len: Option<usize>) -> Result<Self, Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::SeqStart(len)));
+        Ok(self)
+    }
+
+    fn serialize_seq_fixed_size(self, len: usize) -> Result<Self, Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::SeqArrayStart(len)));
+        Ok(self)
+    }
+
+    fn serialize_tuple(self, len: usize) -> Result<Self, Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::TupleStart(len)));
+        Ok(self)
+    }
+
+    fn serialize_tuple_struct(self, name: &'static str, len: usize) -> Result<Self, Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::TupleStructStart(name, len)));
+        Ok(self)
+    }
+
+    fn serialize_tuple_variant(self,
                                name: &str,
                                _variant_index: usize,
                                variant: &str,
-                               len: usize) -> Result<(), Error>
+                               len: usize) -> Result<Self, Error>
     {
         assert_eq!(self.tokens.next(), Some(&Token::EnumSeqStart(name, variant, len)));
-
+        Ok(self)
-        Ok(())
     }
 
-    fn serialize_tuple_variant_elt<T>(&mut self, _: &mut (), value: T) -> Result<(), Error>
+    fn serialize_map(self, len: Option<usize>) -> Result<Self, Error> {
-        where T: Serialize
-    {
-        assert_eq!(self.tokens.next(), Some(&Token::EnumSeqSep));
-        value.serialize(self)
-    }
-
-    fn serialize_tuple_variant_end(&mut self, _: ()) -> Result<(), Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::EnumSeqEnd));
-        Ok(())
-    }
-
-    fn serialize_map(&mut self, len: Option<usize>) -> Result<(), Error>
-    {
         assert_eq!(self.tokens.next(), Some(&Token::MapStart(len)));
-
+        Ok(self)
-        Ok(())
     }
 
-    fn serialize_map_key<T>(&mut self, _: &mut (), key: T) -> Result<(), Self::Error> where T: Serialize {
+    fn serialize_struct(self, name: &str, len: usize) -> Result<Self, Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::MapSep));
-        key.serialize(self)
-    }
-
-    fn serialize_map_value<T>(&mut self, _: &mut (), value: T) -> Result<(), Self::Error> where T: Serialize {
-        value.serialize(self)
-    }
-
-    fn serialize_map_end(&mut self, _: ()) -> Result<(), Self::Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::MapEnd));
-        Ok(())
-    }
-
-    fn serialize_struct(&mut self, name: &str, len: usize) -> Result<(), Error>
-    {
         assert_eq!(self.tokens.next(), Some(&Token::StructStart(name, len)));
-
+        Ok(self)
-        Ok(())
     }
 
-    fn serialize_struct_elt<V>(&mut self, _: &mut (), key: &'static str, value: V) -> Result<(), Self::Error> where V: Serialize {
+    fn serialize_struct_variant(self,
-        assert_eq!(self.tokens.next(), Some(&Token::StructSep));
-        try!(key.serialize(self));
-        value.serialize(self)
-    }
-
-    fn serialize_struct_end(&mut self, _: ()) -> Result<(), Self::Error> {
-        assert_eq!(self.tokens.next(), Some(&Token::StructEnd));
-        Ok(())
-    }
-
-    fn serialize_struct_variant(&mut self,
                                 name: &str,
                                 _variant_index: usize,
                                 variant: &str,
-                                len: usize) -> Result<(), Error>
+                                len: usize) -> Result<Self, Error>
     {
         assert_eq!(self.tokens.next(), Some(&Token::EnumMapStart(name, variant, len)));
+        Ok(self)
+    }
+}
 
+impl<'s, 'a, I> ser::SerializeSeq for &'s mut Serializer<'a, I>
+    where I: Iterator<Item=&'a Token<'a>>,
+{
+    type Ok = ();
+    type Error = Error;
+
+    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+        where T: Serialize
+    {
+        assert_eq!(self.tokens.next(), Some(&Token::SeqSep));
+        value.serialize(&mut **self)
+    }
+
+    fn end(self) -> Result<(), Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::SeqEnd));
         Ok(())
     }
+}
 
-    fn serialize_struct_variant_elt<V>(&mut self, _: &mut (), key: &'static str, value: V) -> Result<(), Self::Error> where V: Serialize {
+impl<'s, 'a, I> ser::SerializeTuple for &'s mut Serializer<'a, I>
-        assert_eq!(self.tokens.next(), Some(&Token::EnumMapSep));
+    where I: Iterator<Item=&'a Token<'a>>,
-        try!(key.serialize(self));
+{
-        value.serialize(self)
+    type Ok = ();
+    type Error = Error;
+
+    fn serialize_element<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+        where T: Serialize
+    {
+        assert_eq!(self.tokens.next(), Some(&Token::TupleSep));
+        value.serialize(&mut **self)
     }
 
-    fn serialize_struct_variant_end(&mut self, _: ()) -> Result<(), Self::Error> {
+    fn end(self) -> Result<(), Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::TupleEnd));
+        Ok(())
+    }
+}
+
+impl<'s, 'a, I> ser::SerializeTupleStruct for &'s mut Serializer<'a, I>
+    where I: Iterator<Item=&'a Token<'a>>,
+{
+    type Ok = ();
+    type Error = Error;
+
+    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+        where T: Serialize
+    {
+        assert_eq!(self.tokens.next(), Some(&Token::TupleStructSep));
+        value.serialize(&mut **self)
+    }
+
+    fn end(self) -> Result<(), Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::TupleStructEnd));
+        Ok(())
+    }
+}
+
+impl<'s, 'a, I> ser::SerializeTupleVariant for &'s mut Serializer<'a, I>
+    where I: Iterator<Item=&'a Token<'a>>,
+{
+    type Ok = ();
+    type Error = Error;
+
+    fn serialize_field<T: ?Sized>(&mut self, value: &T) -> Result<(), Error>
+        where T: Serialize
+    {
+        assert_eq!(self.tokens.next(), Some(&Token::EnumSeqSep));
+        value.serialize(&mut **self)
+    }
+
+    fn end(self) -> Result<(), Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::EnumSeqEnd));
+        Ok(())
+    }
+}
+
+impl<'s, 'a, I> ser::SerializeMap for &'s mut Serializer<'a, I>
+    where I: Iterator<Item=&'a Token<'a>>,
+{
+    type Ok = ();
+    type Error = Error;
+
+    fn serialize_key<T: ?Sized>(&mut self, key: &T) -> Result<(), Self::Error> where T: Serialize {
+        assert_eq!(self.tokens.next(), Some(&Token::MapSep));
+        key.serialize(&mut **self)
+    }
+
+    fn serialize_value<T: ?Sized>(&mut self, value: &T) -> Result<(), Self::Error> where T: Serialize {
+        value.serialize(&mut **self)
+    }
+
+    fn end(self) -> Result<(), Self::Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::MapEnd));
+        Ok(())
+    }
+}
+
+impl<'s, 'a, I> ser::SerializeStruct for &'s mut Serializer<'a, I>
+    where I: Iterator<Item=&'a Token<'a>>,
+{
+    type Ok = ();
+    type Error = Error;
+
+    fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), Self::Error> where T: Serialize {
+        assert_eq!(self.tokens.next(), Some(&Token::StructSep));
+        try!(key.serialize(&mut **self));
+        value.serialize(&mut **self)
+    }
+
+    fn end(self) -> Result<(), Self::Error> {
+        assert_eq!(self.tokens.next(), Some(&Token::StructEnd));
+        Ok(())
+    }
+}
+
+impl<'s, 'a, I> ser::SerializeStructVariant for &'s mut Serializer<'a, I>
+    where I: Iterator<Item=&'a Token<'a>>,
+{
+    type Ok = ();
+    type Error = Error;
+
+    fn serialize_field<T: ?Sized>(&mut self, key: &'static str, value: &T) -> Result<(), Self::Error> where T: Serialize {
+        assert_eq!(self.tokens.next(), Some(&Token::EnumMapSep));
+        try!(key.serialize(&mut **self));
+        value.serialize(&mut **self)
+    }
+
+    fn end(self) -> Result<(), Self::Error> {
         assert_eq!(self.tokens.next(), Some(&Token::EnumMapEnd));
         Ok(())
     }
-
-    fn serialize_bytes(&mut self, value: &[u8]) -> Result<(), Self::Error> {
-        let mut state = try!(self.serialize_seq(Some(value.len())));
-        for c in value {
-            try!(self.serialize_seq_elt(&mut state, c));
-        }
-        self.serialize_seq_end(state)
-    }
 }

serde_test/src/token.rs

@@ -1,12 +1,10 @@
 #[derive(Clone, PartialEq, Debug)]
 pub enum Token<'a> {
     Bool(bool),
-    Isize(isize),
     I8(i8),
     I16(i16),
     I32(i32),
     I64(i64),
-    Usize(usize),
     U8(u8),
     U16(u16),
     U32(u32),
@@ -17,6 +15,7 @@ pub enum Token<'a> {
     Str(&'a str),
     String(String),
     Bytes(&'a [u8]),
+    ByteBuf(Vec<u8>),
 
     Option(bool),
 

testing/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_testing"
-version = "0.8.16"
+version = "0.0.0"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"
@@ -10,6 +10,7 @@ documentation = "https://docs.serde.rs/serde/"
 readme = "README.md"
 keywords = ["serialization"]
 build = "build.rs"
+publish = false
 
 [features]
 unstable-testing = ["clippy", "serde/unstable-testing", "serde_codegen/unstable-testing"]
@@ -19,12 +20,12 @@ serde_codegen = { path = "../serde_codegen", features = ["with-syntex"] }
 
 [dev-dependencies]
 fnv = "1.0"
-rustc-serialize = "^0.3.16"
+rustc-serialize = "0.3.16"
 serde = { path = "../serde" }
 serde_test = { path = "../serde_test" }
 
 [dependencies]
-clippy = { version = "^0.*", optional = true }
+clippy = { version = "0.*", optional = true }
 
 [[test]]
 name = "test"

testing/tests/test.rs

@@ -1,4 +1,6 @@
 #![cfg_attr(feature = "clippy", feature(plugin))]
 #![cfg_attr(feature = "clippy", plugin(clippy))]
 
+#![cfg_attr(feature = "unstable-testing", feature(non_ascii_idents))]
+
 include!(concat!(env!("OUT_DIR"), "/test.rs"));

testing/tests/test.rs.in

@@ -1,4 +1,5 @@
 extern crate serde;
+extern crate serde_test;
 
 #[macro_use]
 mod macros;

testing/tests/test_annotations.rs

@@ -20,12 +20,12 @@ trait ShouldSkip: Sized {
 }
 
 trait SerializeWith: Sized {
-    fn serialize_with<S>(&self, ser: &mut S) -> Result<(), S::Error>
+    fn serialize_with<S>(&self, ser: S) -> Result<S::Ok, S::Error>
         where S: Serializer;
 }
 
 trait DeserializeWith: Sized {
-    fn deserialize_with<D>(de: &mut D) -> Result<Self, D::Error>
+    fn deserialize_with<D>(de: D) -> Result<Self, D::Error>
         where D: Deserializer;
 }
 
@@ -38,7 +38,7 @@ impl ShouldSkip for i32 {
 }
 
 impl SerializeWith for i32 {
-    fn serialize_with<S>(&self, ser: &mut S) -> Result<(), S::Error>
+    fn serialize_with<S>(&self, ser: S) -> Result<S::Ok, S::Error>
         where S: Serializer
     {
         if *self == 123 {
@@ -50,7 +50,7 @@ impl SerializeWith for i32 {
 }
 
 impl DeserializeWith for i32 {
-    fn deserialize_with<D>(de: &mut D) -> Result<Self, D::Error>
+    fn deserialize_with<D>(de: D) -> Result<Self, D::Error>
         where D: Deserializer
     {
         if try!(Deserialize::deserialize(de)) {
@@ -145,7 +145,7 @@ fn test_default_enum() {
     assert_de_tokens(
         &DefaultEnum::Struct { a1: 1, a2: 2, a3: 3, a4: 0, a5: 123 },
         &[
-            Token::EnumMapStart("DefaultEnum", "Struct", 5),
+            Token::EnumMapStart("DefaultEnum", "Struct", 3),
 
             Token::EnumMapSep,
             Token::Str("a1"),
@@ -174,7 +174,7 @@ fn test_default_enum() {
     assert_de_tokens(
         &DefaultEnum::Struct { a1: 1, a2: 0, a3: 123, a4: 0, a5: 123 },
         &[
-            Token::EnumMapStart("DefaultEnum", "Struct", 5),
+            Token::EnumMapStart("DefaultEnum", "Struct", 3),
 
             Token::EnumMapSep,
             Token::Str("a1"),
@@ -239,7 +239,7 @@ impl Default for NotDeserializeStruct {
 }
 
 impl DeserializeWith for NotDeserializeStruct {
-    fn deserialize_with<D>(_: &mut D) -> Result<Self, D::Error>
+    fn deserialize_with<D>(_: D) -> Result<Self, D::Error>
         where D: Deserializer
     {
         panic!()
@@ -343,7 +343,7 @@ fn test_ignore_unknown() {
             Token::StructSep,
             Token::Str("whoops"),
         ],
-        Error::UnknownField("whoops".to_owned())
+        Error::Message("unknown field `whoops`, expected `a1`".to_owned())
     );
 }
 
@@ -642,7 +642,7 @@ struct NotSerializeStruct(i8);
 enum NotSerializeEnum { Trouble }
 
 impl SerializeWith for NotSerializeEnum {
-    fn serialize_with<S>(&self, ser: &mut S) -> Result<(), S::Error>
+    fn serialize_with<S>(&self, ser: S) -> Result<S::Ok, S::Error>
         where S: Serializer
     {
         "trouble".serialize(ser)
@@ -905,7 +905,7 @@ fn test_missing_renamed_field_struct() {
 
             Token::StructEnd,
         ],
-        Error::MissingField("a3"),
+        Error::Message("missing field `a3`".to_owned()),
     );
 
     assert_de_tokens_error::<RenameStructSerializeDeserialize>(
@@ -918,7 +918,7 @@ fn test_missing_renamed_field_struct() {
 
             Token::StructEnd,
         ],
-        Error::MissingField("a5"),
+        Error::Message("missing field `a5`".to_owned()),
     );
 }
 
@@ -930,7 +930,7 @@ fn test_missing_renamed_field_enum() {
 
             Token::EnumMapEnd,
         ],
-        Error::MissingField("b"),
+        Error::Message("missing field `b`".to_owned()),
     );
 
     assert_de_tokens_error::<RenameEnumSerializeDeserialize<i8>>(
@@ -943,7 +943,7 @@ fn test_missing_renamed_field_enum() {
 
             Token::EnumMapEnd,
         ],
-        Error::MissingField("d"),
+        Error::Message("missing field `d`".to_owned()),
     );
 }
 
@@ -962,7 +962,7 @@ fn test_invalid_length_enum() {
                 Token::I32(1),
             Token::EnumSeqEnd,
         ],
-        Error::InvalidLength(1),
+        Error::Message("invalid length 1, expected tuple of 3 elements".to_owned()),
     );
     assert_de_tokens_error::<InvalidLengthEnum>(
         &[
@@ -971,6 +971,6 @@ fn test_invalid_length_enum() {
                 Token::I32(1),
             Token::EnumSeqEnd,
         ],
-        Error::InvalidLength(1),
+        Error::Message("invalid length 1, expected tuple of 2 elements".to_owned()),
     );
 }

testing/tests/test_bytes.rs

@@ -1,460 +1,55 @@
-use std::fmt;
-use std::error;
-
-use serde::{Serialize, Serializer, Deserialize, Deserializer};
 use serde::bytes::{ByteBuf, Bytes};
-use serde::ser;
+use serde_test::{assert_tokens, assert_ser_tokens, assert_de_tokens, Token};
-use serde::de;
-
-///////////////////////////////////////////////////////////////////////////////
-
-#[derive(Debug, PartialEq)]
-struct Error;
-
-impl ser::Error for Error {
-    fn custom<T: Into<String>>(_: T) -> Error { Error }
-}
-
-impl de::Error for Error {
-    fn custom<T: Into<String>>(_: T) -> Error { Error }
-
-    fn end_of_stream() -> Error { Error }
-}
-
-impl fmt::Display for Error {
-    fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-        formatter.write_str(format!("{:?}", self).as_ref())
-    }
-}
-
-impl error::Error for Error {
-    fn description(&self) -> &str {
-        "Serde Deserialization Error"
-    }
-
-    fn cause(&self) -> Option<&error::Error> {
-        None
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-struct BytesSerializer {
-    bytes: Vec<u8>,
-}
-
-impl BytesSerializer {
-    fn new(bytes: Vec<u8>) -> Self {
-        BytesSerializer {
-            bytes: bytes,
-        }
-    }
-}
-
-impl Serializer for BytesSerializer {
-    type Error = Error;
-    type SeqState = ();
-    type MapState = ();
-    type TupleState = ();
-    type TupleStructState = ();
-    type TupleVariantState = ();
-    type StructState = ();
-    type StructVariantState = ();
-
-    fn serialize_unit(&mut self) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_unit_struct(&mut self, _name: &'static str) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_unit_variant(&mut self, _: &'static str, _: usize, _: &'static str) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_bool(&mut self, _v: bool) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_isize(&mut self, _v: isize) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_usize(&mut self, _v: usize) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_i8(&mut self, _v: i8) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_u8(&mut self, _v: u8) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_i16(&mut self, _v: i16) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_u16(&mut self, _v: u16) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_i32(&mut self, _v: i32) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_u32(&mut self, _v: u32) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_i64(&mut self, _v: i64) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_u64(&mut self, _v: u64) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_f32(&mut self, _v: f32) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_f64(&mut self, _v: f64) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_char(&mut self, _v: char) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_str(&mut self, _v: &str) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_none(&mut self) -> Result<(), Error> {
-        Err(Error)
-    }
-
-    fn serialize_some<V>(&mut self, _value: V) -> Result<(), Error>
-        where V: Serialize,
-    {
-        Err(Error)
-    }
-
-    fn serialize_newtype_struct<V>(&mut self, _: &'static str, _value: V) -> Result<(), Error>
-        where V: Serialize,
-    {
-        Err(Error)
-    }
-
-    fn serialize_newtype_variant<V>(&mut self, _: &'static str, _: usize, _: &'static str, _value: V) -> Result<(), Error>
-        where V: Serialize,
-    {
-        Err(Error)
-    }
-
-    fn serialize_seq(&mut self, _len: Option<usize>) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_seq_fixed_size(&mut self, _len: usize) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_seq_elt<T>(&mut self, _: &mut (), _value: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        Err(Error)
-    }
-
-    fn serialize_seq_end(&mut self, _: ()) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple(&mut self, _len: usize) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_elt<T>(&mut self, _: &mut (), _value: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_end(&mut self, _: ()) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_struct(&mut self, _: &'static str, _len: usize) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_struct_elt<T>(&mut self, _: &mut (), _value: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_struct_end(&mut self, _: ()) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_variant(&mut self, _: &'static str, _: usize, _: &'static str, _len: usize) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_variant_elt<T>(&mut self, _: &mut (), _value: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        Err(Error)
-    }
-
-    fn serialize_tuple_variant_end(&mut self, _: ()) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_map(&mut self, _: Option<usize>) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_map_key<T>(&mut self, _: &mut (), _key: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        Err(Error)
-    }
-
-    fn serialize_map_value<T>(&mut self, _: &mut (), _value: T) -> Result<(), Error>
-        where T: Serialize
-    {
-        Err(Error)
-    }
-
-    fn serialize_map_end(&mut self, _: ()) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_struct(&mut self, _: &'static str, _: usize) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_struct_elt<V>(&mut self, _: &mut (), _key: &'static str, _value: V) -> Result<(), Error>
-        where V: Serialize,
-    {
-        Err(Error)
-    }
-
-    fn serialize_struct_end(&mut self, _: ()) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_struct_variant(&mut self, _: &'static str, _: usize, _: &'static str, _: usize) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_struct_variant_elt<V>(&mut self, _: &mut (), _key: &'static str, _value: V) -> Result<(), Error>
-        where V: Serialize,
-    {
-        Err(Error)
-    }
-
-    fn serialize_struct_variant_end(&mut self, _: ()) -> Result<(), Error>
-    {
-        Err(Error)
-    }
-
-    fn serialize_bytes(&mut self, bytes: &[u8]) -> Result<(), Error> {
-        assert_eq!(self.bytes, bytes);
-        Ok(())
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-struct BytesDeserializer {
-    bytes: Option<Vec<u8>>,
-}
-
-impl BytesDeserializer {
-    fn new(bytes: Vec<u8>) -> Self {
-        BytesDeserializer {
-            bytes: Some(bytes),
-        }
-    }
-}
-
-impl Deserializer for BytesDeserializer {
-    type Error = Error;
-
-    fn deserialize<V>(&mut self, _visitor: V) -> Result<V::Value, Error>
-        where V: de::Visitor,
-    {
-        Err(Error)
-    }
-
-    fn deserialize_bytes<V>(&mut self, mut visitor: V) -> Result<V::Value, Error>
-        where V: de::Visitor,
-    {
-        visitor.visit_byte_buf(self.bytes.take().unwrap())
-    }
-
-    fn deserialize_seq<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_struct_field<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_map<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_unit<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_ignored_any<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_string<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_str<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_char<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_i64<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_i32<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_i16<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_i8<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_u64<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_u32<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_u16<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_u8<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_f32<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_f64<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_bool<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_usize<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_isize<__V>(&mut self, visitor: __V) -> Result<__V::Value, Self::Error>
-        where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_option<__V>(&mut self, visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_seq_fixed_size<__V>(&mut self, _: usize, visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_unit_struct<__V>(&mut self, _: &str, visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_newtype_struct<__V>(&mut self, _: &str, visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_tuple_struct<__V>(&mut self, _: &str, _: usize, visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_struct<__V>(&mut self, _: &str, _: &[&str], visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_tuple<__V>(&mut self, _: usize, visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::Visitor {
-        self.deserialize(visitor)
-    }
-    fn deserialize_enum<__V>(&mut self, _: &str, _: &[&str], _visitor: __V)
-     -> Result<__V::Value, Self::Error> where __V: de::EnumVisitor {
-        Err(Error)
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
 
 #[test]
-fn test_bytes_ser_bytes() {
+fn test_bytes() {
-    let buf = vec![];
+    let empty = Bytes::new(&[]);
-    let bytes = Bytes::from(&buf);
+    assert_ser_tokens(&empty, &[Token::Bytes(b"")]);
-    let mut ser = BytesSerializer::new(vec![]);
-    bytes.serialize(&mut ser).unwrap();
 
-    let buf = vec![1, 2, 3];
+    let buf = vec![65, 66, 67];
-    let bytes = Bytes::from(&buf);
+    let bytes = Bytes::new(&buf);
-    let mut ser = BytesSerializer::new(vec![1, 2, 3]);
+    assert_ser_tokens(&bytes, &[Token::Bytes(b"ABC")]);
-    bytes.serialize(&mut ser).unwrap();
 }
 
-///////////////////////////////////////////////////////////////////////////////
-
 #[test]
-fn test_byte_buf_de_bytes() {
+fn test_byte_buf() {
-    let mut de = BytesDeserializer::new(vec![]);
+    let empty = ByteBuf::new();
-    let bytes = Deserialize::deserialize(&mut de);
+    assert_tokens(&empty, &[Token::Bytes(b"")]);
-    assert_eq!(bytes, Ok(ByteBuf::new()));
+    assert_de_tokens(&empty, &[Token::ByteBuf(Vec::new())]);
+    assert_de_tokens(&empty, &[Token::Str("")]);
+    assert_de_tokens(&empty, &[Token::String(String::new())]);
+    assert_de_tokens(&empty, &[
+        Token::SeqStart(None),
+        Token::SeqEnd,
+    ]);
+    assert_de_tokens(&empty, &[
+        Token::SeqStart(Some(0)),
+        Token::SeqEnd,
+    ]);
 
-    let mut de = BytesDeserializer::new(vec![1, 2, 3]);
+    let buf = ByteBuf::from(vec![65, 66, 67]);
-    let bytes = Deserialize::deserialize(&mut de);
+    assert_tokens(&buf, &[Token::Bytes(b"ABC")]);
-    assert_eq!(bytes, Ok(ByteBuf::from(vec![1, 2, 3])));
+    assert_de_tokens(&buf, &[Token::ByteBuf(vec![65, 66, 67])]);
+    assert_de_tokens(&buf, &[Token::Str("ABC")]);
+    assert_de_tokens(&buf, &[Token::String("ABC".to_owned())]);
+    assert_de_tokens(&buf, &[
+        Token::SeqStart(None),
+        Token::SeqSep,
+        Token::U8(65),
+        Token::SeqSep,
+        Token::U8(66),
+        Token::SeqSep,
+        Token::U8(67),
+        Token::SeqEnd,
+    ]);
+    assert_de_tokens(&buf, &[
+        Token::SeqStart(Some(3)),
+        Token::SeqSep,
+        Token::U8(65),
+        Token::SeqSep,
+        Token::U8(66),
+        Token::SeqSep,
+        Token::U8(67),
+        Token::SeqEnd,
+    ]);
 }

testing/tests/test_de.rs

@@ -32,12 +32,43 @@ struct Struct {
     c: i32,
 }
 
+#[derive(PartialEq, Debug, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct StructDenyUnknown {
+    a: i32,
+    #[serde(skip_deserializing)]
+    b: i32,
+}
+
+#[derive(PartialEq, Debug, Deserialize)]
+struct StructSkipAll {
+    #[serde(skip_deserializing)]
+    a: i32,
+}
+
+#[derive(PartialEq, Debug, Deserialize)]
+#[serde(deny_unknown_fields)]
+struct StructSkipAllDenyUnknown {
+    #[serde(skip_deserializing)]
+    a: i32,
+}
+
 #[derive(PartialEq, Debug, Deserialize)]
 enum Enum {
+    #[allow(dead_code)]
+    #[serde(skip_deserializing)]
+    Skipped,
     Unit,
     Simple(i32),
     Seq(i32, i32, i32),
-    Map { a: i32, b: i32, c: i32 }
+    Map { a: i32, b: i32, c: i32 },
+}
+
+#[derive(PartialEq, Debug, Deserialize)]
+enum EnumSkipAll {
+    #[allow(dead_code)]
+    #[serde(skip_deserializing)]
+    Skipped,
 }
 
 //////////////////////////////////////////////////////////////////////////
@@ -124,12 +155,10 @@ declare_tests! {
         false => &[Token::Bool(false)],
     }
     test_isize {
-        0isize => &[Token::Isize(0)],
         0isize => &[Token::I8(0)],
         0isize => &[Token::I16(0)],
         0isize => &[Token::I32(0)],
         0isize => &[Token::I64(0)],
-        0isize => &[Token::Usize(0)],
         0isize => &[Token::U8(0)],
         0isize => &[Token::U16(0)],
         0isize => &[Token::U32(0)],
@@ -138,14 +167,12 @@ declare_tests! {
         0isize => &[Token::F64(0.)],
     }
     test_ints {
-        0isize => &[Token::Isize(0)],
         0i8 => &[Token::I8(0)],
         0i16 => &[Token::I16(0)],
         0i32 => &[Token::I32(0)],
         0i64 => &[Token::I64(0)],
     }
     test_uints {
-        0usize => &[Token::Usize(0)],
         0u8 => &[Token::U8(0)],
         0u16 => &[Token::U16(0)],
         0u32 => &[Token::U32(0)],
@@ -215,6 +242,9 @@ declare_tests! {
             Token::SeqEnd,
         ],
     }
+    test_unit_string {
+        String::new() => &[Token::Unit],
+    }
     test_tuple_struct {
         TupleStruct(1, 2, 3) => &[
             Token::SeqStart(Some(3)),
@@ -675,6 +705,29 @@ declare_tests! {
             Token::StructEnd,
         ],
     }
+    test_struct_skip_all {
+        StructSkipAll { a: 0 } => &[
+            Token::StructStart("StructSkipAll", 0),
+            Token::StructEnd,
+        ],
+        StructSkipAll { a: 0 } => &[
+            Token::StructStart("StructSkipAll", 1),
+                Token::StructSep,
+                Token::Str("a"),
+                Token::I32(1),
+
+                Token::StructSep,
+                Token::Str("b"),
+                Token::I32(2),
+            Token::StructEnd,
+        ],
+    }
+    test_struct_skip_all_deny_unknown {
+        StructSkipAllDenyUnknown { a: 0 } => &[
+            Token::StructStart("StructSkipAllDenyUnknown", 0),
+            Token::StructEnd,
+        ],
+    }
     test_enum_unit {
         Enum::Unit => &[
             Token::EnumUnit("Enum", "Unit"),
@@ -720,7 +773,7 @@ declare_tests! {
     test_enum_unit_usize {
         Enum::Unit => &[
             Token::EnumStart("Enum"),
-            Token::Usize(0),
+            Token::U32(0),
             Token::Unit,
         ],
     }
@@ -796,11 +849,51 @@ fn test_net_ipaddr() {
 }
 
 declare_error_tests! {
+    test_unknown_field<StructDenyUnknown> {
+        &[
+            Token::StructStart("StructDenyUnknown", 2),
+                Token::StructSep,
+                Token::Str("a"),
+                Token::I32(0),
+
+                Token::StructSep,
+                Token::Str("d"),
+        ],
+        Error::Message("unknown field `d`, expected `a`".to_owned()),
+    }
+    test_skipped_field_is_unknown<StructDenyUnknown> {
+        &[
+            Token::StructStart("StructDenyUnknown", 2),
+                Token::StructSep,
+                Token::Str("b"),
+        ],
+        Error::Message("unknown field `b`, expected `a`".to_owned()),
+    }
+    test_skip_all_deny_unknown<StructSkipAllDenyUnknown> {
+        &[
+            Token::StructStart("StructSkipAllDenyUnknown", 1),
+                Token::StructSep,
+                Token::Str("a"),
+        ],
+        Error::Message("unknown field `a`, there are no fields".to_owned()),
+    }
     test_unknown_variant<Enum> {
         &[
             Token::EnumUnit("Enum", "Foo"),
         ],
-        Error::UnknownVariant("Foo".to_owned()),
+        Error::Message("unknown variant `Foo`, expected one of `Unit`, `Simple`, `Seq`, `Map`".to_owned()),
+    }
+    test_enum_skipped_variant<Enum> {
+        &[
+            Token::EnumUnit("Enum", "Skipped"),
+        ],
+        Error::Message("unknown variant `Skipped`, expected one of `Unit`, `Simple`, `Seq`, `Map`".to_owned()),
+    }
+    test_enum_skip_all<EnumSkipAll> {
+        &[
+            Token::EnumUnit("EnumSkipAll", "Skipped"),
+        ],
+        Error::Message("unknown variant `Skipped`, there are no variants".to_owned()),
     }
     test_struct_seq_too_long<Struct> {
         &[
@@ -821,7 +914,7 @@ declare_error_tests! {
                 Token::MapSep,
                 Token::Str("a"),
         ],
-        Error::DuplicateField("a"),
+        Error::Message("duplicate field `a`".to_owned()),
     }
     test_duplicate_field_enum<Enum> {
         &[
@@ -833,6 +926,14 @@ declare_error_tests! {
                 Token::EnumMapSep,
                 Token::Str("a"),
         ],
-        Error::DuplicateField("a"),
+        Error::Message("duplicate field `a`".to_owned()),
+    }
+    test_enum_out_of_range<Enum> {
+        &[
+            Token::EnumStart("Enum"),
+            Token::U32(4),
+            Token::Unit,
+        ],
+        Error::Message("invalid value: integer `4`, expected variant index 0 <= i < 4".into()),
     }
 }

testing/tests/test_gen.rs

@@ -202,6 +202,91 @@ fn test_gen() {
         EmptyStruct {},
     }
     assert::<EmptyEnumVariant>();
+
+    #[cfg(feature = "unstable-testing")]
+    #[cfg_attr(feature = "unstable-testing", derive(Serialize, Deserialize))]
+    struct NonAsciiIdents {
+        σ: f64
+    }
+
+    #[derive(Serialize, Deserialize)]
+    struct EmptyBraced {}
+
+    #[derive(Serialize, Deserialize)]
+    #[serde(deny_unknown_fields)]
+    struct EmptyBracedDenyUnknown {}
+
+    #[derive(Serialize, Deserialize)]
+    struct BracedSkipAll {
+        #[serde(skip_deserializing)]
+        f: u8,
+    }
+
+    #[derive(Serialize, Deserialize)]
+    #[serde(deny_unknown_fields)]
+    struct BracedSkipAllDenyUnknown {
+        #[serde(skip_deserializing)]
+        f: u8,
+    }
+
+    #[cfg(feature = "unstable-testing")]
+    #[cfg_attr(feature = "unstable-testing", derive(Serialize, Deserialize))]
+    struct EmptyTuple();
+
+    #[cfg(feature = "unstable-testing")]
+    #[cfg_attr(feature = "unstable-testing", derive(Serialize, Deserialize))]
+    #[serde(deny_unknown_fields)]
+    struct EmptyTupleDenyUnknown();
+
+    #[derive(Serialize, Deserialize)]
+    struct TupleSkipAll(#[serde(skip_deserializing)] u8);
+
+    #[derive(Serialize, Deserialize)]
+    #[serde(deny_unknown_fields)]
+    struct TupleSkipAllDenyUnknown(#[serde(skip_deserializing)] u8);
+
+    #[derive(Serialize, Deserialize)]
+    enum EmptyEnum {}
+
+    #[derive(Serialize, Deserialize)]
+    #[serde(deny_unknown_fields)]
+    enum EmptyEnumDenyUnknown {}
+
+    #[derive(Serialize, Deserialize)]
+    enum EnumSkipAll {
+        #[serde(skip_deserializing)]
+        #[allow(dead_code)]
+        Variant,
+    }
+
+    #[cfg(feature = "unstable-testing")]
+    #[cfg_attr(feature = "unstable-testing", derive(Serialize, Deserialize))]
+    enum EmptyVariants {
+        Braced {},
+        Tuple(),
+        BracedSkip {
+            #[serde(skip_deserializing)]
+            f: u8,
+        },
+        TupleSkip(#[serde(skip_deserializing)] u8),
+    }
+
+    #[cfg(feature = "unstable-testing")]
+    #[cfg_attr(feature = "unstable-testing", derive(Serialize, Deserialize))]
+    #[serde(deny_unknown_fields)]
+    enum EmptyVariantsDenyUnknown {
+        Braced {},
+        Tuple(),
+        BracedSkip {
+            #[serde(skip_deserializing)]
+            f: u8,
+        },
+        TupleSkip(#[serde(skip_deserializing)] u8),
+    }
+
+    #[derive(Serialize, Deserialize)]
+    #[serde(deny_unknown_fields)]
+    struct UnitDenyUnknown;
 }
 
 //////////////////////////////////////////////////////////////////////////
@@ -210,32 +295,32 @@ fn assert<T: Serialize + Deserialize>() {}
 fn assert_ser<T: Serialize>() {}
 
 trait SerializeWith {
-    fn serialize_with<S: Serializer>(_: &Self, _: &mut S) -> StdResult<(), S::Error>;
+    fn serialize_with<S: Serializer>(_: &Self, _: S) -> StdResult<S::Ok, S::Error>;
 }
 
 trait DeserializeWith: Sized {
-    fn deserialize_with<D: Deserializer>(_: &mut D) -> StdResult<Self, D::Error>;
+    fn deserialize_with<D: Deserializer>(_: D) -> StdResult<Self, D::Error>;
 }
 
 // Implements neither Serialize nor Deserialize
 struct X;
 
-fn ser_x<S: Serializer>(_: &X, _: &mut S) -> StdResult<(), S::Error> {
+fn ser_x<S: Serializer>(_: &X, _: S) -> StdResult<S::Ok, S::Error> {
     unimplemented!()
 }
 
-fn de_x<D: Deserializer>(_: &mut D) -> StdResult<X, D::Error> {
+fn de_x<D: Deserializer>(_: D) -> StdResult<X, D::Error> {
     unimplemented!()
 }
 
 impl SerializeWith for X {
-    fn serialize_with<S: Serializer>(_: &Self, _: &mut S) -> StdResult<(), S::Error> {
+    fn serialize_with<S: Serializer>(_: &Self, _: S) -> StdResult<S::Ok, S::Error> {
         unimplemented!()
     }
 }
 
 impl DeserializeWith for X {
-    fn deserialize_with<D: Deserializer>(_: &mut D) -> StdResult<Self, D::Error> {
+    fn deserialize_with<D: Deserializer>(_: D) -> StdResult<Self, D::Error> {
         unimplemented!()
     }
 }

testing/tests/test_ser.rs

@@ -15,6 +15,9 @@ use self::serde_test::{
 extern crate fnv;
 use self::fnv::FnvHasher;
 
+#[cfg(feature = "unstable")]
+use serde::ser::iterator;
+
 //////////////////////////////////////////////////////////////////////////
 
 #[derive(Serialize)]
@@ -30,12 +33,20 @@ struct Struct {
     c: i32,
 }
 
-#[derive(Serialize)]
+#[derive(Serialize, PartialEq, Debug)]
 enum Enum {
     Unit,
     One(i32),
     Seq(i32, i32),
     Map { a: i32, b: i32 },
+    #[serde(skip_serializing)]
+    SkippedUnit,
+    #[serde(skip_serializing)]
+    SkippedOne(i32),
+    #[serde(skip_serializing)]
+    SkippedSeq(i32, i32),
+    #[serde(skip_serializing)]
+    SkippedMap { _a: i32, _b: i32 },
 }
 
 //////////////////////////////////////////////////////////////////////////
@@ -49,14 +60,12 @@ declare_ser_tests! {
         false => &[Token::Bool(false)],
     }
     test_isizes {
-        0isize => &[Token::Isize(0)],
         0i8 => &[Token::I8(0)],
         0i16 => &[Token::I16(0)],
         0i32 => &[Token::I32(0)],
         0i64 => &[Token::I64(0)],
     }
     test_usizes {
-        0usize => &[Token::Usize(0)],
         0u8 => &[Token::U8(0)],
         0u16 => &[Token::U16(0)],
         0u32 => &[Token::U32(0)],
@@ -361,6 +370,49 @@ declare_ser_tests! {
     }
 }
 
+
+#[cfg(feature = "unstable")]
+#[test]
+fn test_iterator() {
+    assert_ser_tokens(iterator([0; 0].iter()), &[
+        Token::SeqStart(Some(0)),
+        Token::SeqEnd,
+    ]);
+    assert_ser_tokens(iterator([1, 2, 3].iter()), &[
+        Token::SeqStart(Some(3)),
+            Token::SeqSep,
+            Token::I32(1),
+
+            Token::SeqSep,
+            Token::I32(2),
+
+            Token::SeqSep,
+            Token::I32(3),
+        Token::SeqEnd,
+    ]);
+    assert_ser_tokens(iterator([1, 2, 3].iter().map(|x| x * 2)), &[
+        Token::SeqStart(Some(3)),
+            Token::SeqSep,
+            Token::I32(2),
+
+            Token::SeqSep,
+            Token::I32(4),
+
+            Token::SeqSep,
+            Token::I32(6),
+        Token::SeqEnd,
+    ]);
+    assert_ser_tokens(iterator([1, 2, 3].iter().filter(|&x| x % 2 != 0)), &[
+        Token::SeqStart(None),
+            Token::SeqSep,
+            Token::I32(1),
+
+            Token::SeqSep,
+            Token::I32(3),
+        Token::SeqEnd,
+    ]);
+}
+
 #[cfg(feature = "unstable")]
 #[test]
 fn test_net_ipaddr() {
@@ -378,7 +430,7 @@ fn test_cannot_serialize_paths() {
     assert_ser_tokens_error(
         &Path::new(path),
         &[],
-        Error::InvalidValue("Path contains invalid UTF-8 characters".to_owned()));
+        Error::Message("path contains invalid UTF-8 characters".to_owned()));
 
     let mut path_buf = PathBuf::new();
     path_buf.push(path);
@@ -386,5 +438,25 @@ fn test_cannot_serialize_paths() {
     assert_ser_tokens_error(
         &path_buf,
         &[],
-        Error::InvalidValue("Path contains invalid UTF-8 characters".to_owned()));
+        Error::Message("path contains invalid UTF-8 characters".to_owned()));
+}
+
+#[test]
+fn test_enum_skipped() {
+    assert_ser_tokens_error(
+        &Enum::SkippedUnit,
+        &[],
+        Error::Message("the enum variant Enum::SkippedUnit cannot be serialized".to_owned()));
+    assert_ser_tokens_error(
+        &Enum::SkippedOne(42),
+        &[],
+        Error::Message("the enum variant Enum::SkippedOne cannot be serialized".to_owned()));
+    assert_ser_tokens_error(
+        &Enum::SkippedSeq(1, 2),
+        &[],
+        Error::Message("the enum variant Enum::SkippedSeq cannot be serialized".to_owned()));
+    assert_ser_tokens_error(
+        &Enum::SkippedMap { _a: 1, _b: 2 },
+        &[],
+        Error::Message("the enum variant Enum::SkippedMap cannot be serialized".to_owned()));
 }