Release 1.0.9

Fix deserializer bounds on remote derive

serde/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde"
-version = "1.0.3" # remember to update html_root_url
+version = "1.0.9" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"
@@ -48,22 +48,15 @@ std = []
 #    https://github.com/serde-rs/serde/issues/812
 unstable = []
 
-# Provide impls for types that require memory allocation like Box<T> and Rc<T>.
-# This is a subset of std but may be enabled without depending on all of std.
+# Provide impls for types in the Rust core allocation and collections library
+# including String, Box<T>, Vec<T>, and Cow<T>. This is a subset of std but may
+# be enabled without depending on all of std.
 #
 # Requires a dependency on the unstable core allocation library:
 #
 #    https://doc.rust-lang.org/alloc/
 alloc = ["unstable"]
 
-# Provide impls for collection types like String and Cow<T>. This is a subset of
-# std but may be enabled without depending on all of std.
-#
-# Requires a dependency on the unstable collections library:
-#
-#    https://doc.rust-lang.org/collections/
-collections = ["alloc"]
-
 # Opt into impls for Rc<T> and Arc<T>. Serializing and deserializing these types
 # does not preserve identity and may result in multiple copies of the same data.
 # Be sure that this is what you want before enabling this feature.

serde/src/de/impls.rs

@@ -11,12 +11,12 @@ use lib::*;
 use de::{Deserialize, Deserializer, EnumAccess, Error, SeqAccess, Unexpected, VariantAccess,
          Visitor};
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 use de::MapAccess;
 
 use de::from_primitive::FromPrimitive;
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 use private::de::size_hint;
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -208,10 +208,10 @@ impl<'de> Deserialize<'de> for char {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 struct StringVisitor;
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de> Visitor<'de> for StringVisitor {
     type Value = String;
 
@@ -254,7 +254,7 @@ impl<'de> Visitor<'de> for StringVisitor {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de> Deserialize<'de> for String {
     fn deserialize<D>(deserializer: D) -> Result<String, D::Error>
     where
@@ -497,7 +497,7 @@ impl<'de, T> Deserialize<'de> for PhantomData<T> {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 macro_rules! seq_impl {
     (
         $ty:ident < T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)* >,
@@ -552,7 +552,7 @@ macro_rules! seq_impl {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(
     BinaryHeap<T: Ord>,
     seq,
@@ -560,7 +560,7 @@ seq_impl!(
     BinaryHeap::with_capacity(size_hint::cautious(seq.size_hint())),
     BinaryHeap::push);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(
     BTreeSet<T: Eq + Ord>,
     seq,
@@ -568,7 +568,7 @@ seq_impl!(
     BTreeSet::new(),
     BTreeSet::insert);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(
     LinkedList<T>,
     seq,
@@ -584,7 +584,7 @@ seq_impl!(
     HashSet::with_capacity_and_hasher(size_hint::cautious(seq.size_hint()), S::default()),
     HashSet::insert);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(
     Vec<T>,
     seq,
@@ -592,7 +592,7 @@ seq_impl!(
     Vec::with_capacity(size_hint::cautious(seq.size_hint())),
     Vec::push);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(
     VecDeque<T>,
     seq,
@@ -790,7 +790,7 @@ tuple_impls! {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 macro_rules! map_impl {
     (
         $ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)* >,
@@ -846,7 +846,7 @@ macro_rules! map_impl {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 map_impl!(
     BTreeMap<K: Ord, V>,
     map,
@@ -1110,7 +1110,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, T> Deserialize<'de> for Box<[T]>
 where
     T: Deserialize<'de>,
@@ -1123,7 +1123,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de> Deserialize<'de> for Box<str> {
     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where
@@ -1159,7 +1159,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, 'a, T: ?Sized> Deserialize<'de> for Cow<'a, T>
 where
     T: ToOwned,

serde/src/de/mod.rs

@@ -1262,7 +1262,7 @@ pub trait Visitor<'de>: Sized {
     /// The default implementation forwards to `visit_str` and then drops the
     /// `String`.
     #[inline]
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
     where
         E: Error,
@@ -1321,7 +1321,7 @@ pub trait Visitor<'de>: Sized {
     ///
     /// The default implementation forwards to `visit_bytes` and then drops the
     /// `Vec<u8>`.
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
     where
         E: Error,

serde/src/de/value.rs

@@ -51,13 +51,13 @@ pub struct Error {
     err: ErrorImpl,
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 type ErrorImpl = Box<str>;
-#[cfg(not(any(feature = "std", feature = "collections")))]
+#[cfg(not(any(feature = "std", feature = "alloc")))]
 type ErrorImpl = ();
 
 impl de::Error for Error {
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     fn custom<T>(msg: T) -> Self
     where
         T: Display,
@@ -65,7 +65,7 @@ impl de::Error for Error {
         Error { err: msg.to_string().into_boxed_str() }
     }
 
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     fn custom<T>(msg: T) -> Self
     where
         T: Display,
@@ -85,12 +85,12 @@ impl ser::Error for Error {
 }
 
 impl Display for Error {
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         formatter.write_str(&self.err)
     }
 
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         formatter.write_str("Serde deserialization error")
     }
@@ -355,15 +355,84 @@ where
 
 ////////////////////////////////////////////////////////////////////////////////
 
+/// A deserializer holding a `&str` with a lifetime tied to another
+/// deserializer.
+#[derive(Clone, Debug)]
+pub struct BorrowedStrDeserializer<'de, E> {
+    value: &'de str,
+    marker: PhantomData<E>,
+}
+
+impl<'de, E> BorrowedStrDeserializer<'de, E> {
+    /// Create a new borrowed deserializer from the given string.
+    pub fn new(value: &'de str) -> BorrowedStrDeserializer<'de, E> {
+        BorrowedStrDeserializer {
+            value: value,
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<'de, E> de::Deserializer<'de> for BorrowedStrDeserializer<'de, E>
+where
+    E: de::Error,
+{
+    type Error = E;
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_borrowed_str(self.value)
+    }
+
+    fn deserialize_enum<V>(
+        self,
+        name: &str,
+        variants: &'static [&'static str],
+        visitor: V,
+    ) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        let _ = name;
+        let _ = variants;
+        visitor.visit_enum(self)
+    }
+
+    forward_to_deserialize_any! {
+        bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 char str string bytes
+        byte_buf option unit unit_struct newtype_struct seq tuple tuple_struct
+        map struct identifier ignored_any
+    }
+}
+
+impl<'de, E> de::EnumAccess<'de> for BorrowedStrDeserializer<'de, E>
+where
+    E: de::Error,
+{
+    type Error = E;
+    type Variant = private::UnitOnly<E>;
+
+    fn variant_seed<T>(self, seed: T) -> Result<(T::Value, Self::Variant), Self::Error>
+    where
+        T: de::DeserializeSeed<'de>,
+    {
+        seed.deserialize(self).map(private::unit_only)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
 /// A deserializer holding a `String`.
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 #[derive(Clone, Debug)]
 pub struct StringDeserializer<E> {
     value: String,
     marker: PhantomData<E>,
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, E> IntoDeserializer<'de, E> for String
 where
     E: de::Error,
@@ -378,7 +447,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, E> de::Deserializer<'de> for StringDeserializer<E>
 where
     E: de::Error,
@@ -413,7 +482,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, 'a, E> de::EnumAccess<'de> for StringDeserializer<E>
 where
     E: de::Error,
@@ -432,14 +501,14 @@ where
 ////////////////////////////////////////////////////////////////////////////////
 
 /// A deserializer holding a `Cow<str>`.
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 #[derive(Clone, Debug)]
 pub struct CowStrDeserializer<'a, E> {
     value: Cow<'a, str>,
     marker: PhantomData<E>,
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, 'a, E> IntoDeserializer<'de, E> for Cow<'a, str>
 where
     E: de::Error,
@@ -454,7 +523,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, 'a, E> de::Deserializer<'de> for CowStrDeserializer<'a, E>
 where
     E: de::Error,
@@ -492,7 +561,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, 'a, E> de::EnumAccess<'de> for CowStrDeserializer<'a, E>
 where
     E: de::Error,
@@ -510,6 +579,46 @@ where
 
 ////////////////////////////////////////////////////////////////////////////////
 
+/// A deserializer holding a `&[u8]` with a lifetime tied to another
+/// deserializer.
+#[derive(Clone, Debug)]
+pub struct BorrowedBytesDeserializer<'de, E> {
+    value: &'de [u8],
+    marker: PhantomData<E>,
+}
+
+impl<'de, E> BorrowedBytesDeserializer<'de, E> {
+    /// Create a new borrowed deserializer from the given byte slice.
+    pub fn new(value: &'de [u8]) -> BorrowedBytesDeserializer<'de, E> {
+        BorrowedBytesDeserializer {
+            value: value,
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<'de, E> de::Deserializer<'de> for BorrowedBytesDeserializer<'de, E>
+where
+    E: de::Error,
+{
+    type Error = E;
+
+    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
+    where
+        V: de::Visitor<'de>,
+    {
+        visitor.visit_borrowed_bytes(self.value)
+    }
+
+    forward_to_deserialize_any! {
+        bool i8 i16 i32 i64 u8 u16 u32 u64 f32 f64 char str string bytes
+        byte_buf option unit unit_struct newtype_struct seq tuple tuple_struct
+        map struct identifier ignored_any enum
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
 /// A deserializer that iterates over a sequence.
 #[derive(Clone, Debug)]
 pub struct SeqDeserializer<I, E> {
@@ -618,7 +727,7 @@ impl Expected for ExpectedInSeq {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, T, E> IntoDeserializer<'de, E> for Vec<T>
 where
     T: IntoDeserializer<'de, E>,
@@ -631,7 +740,7 @@ where
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, T, E> IntoDeserializer<'de, E> for BTreeSet<T>
 where
     T: IntoDeserializer<'de, E> + Eq + Ord,
@@ -1036,7 +1145,7 @@ impl Expected for ExpectedInMap {
 
 ////////////////////////////////////////////////////////////////////////////////
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl<'de, K, V, E> IntoDeserializer<'de, E> for BTreeMap<K, V>
 where
     K: IntoDeserializer<'de, E> + Eq + Ord,

serde/src/export.rs

@@ -19,7 +19,7 @@ pub use self::string::from_utf8_lossy;
 mod string {
     use lib::*;
 
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     pub fn from_utf8_lossy(bytes: &[u8]) -> Cow<str> {
         String::from_utf8_lossy(bytes)
     }
@@ -31,7 +31,7 @@ mod string {
     //
     // 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 = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     pub fn from_utf8_lossy(bytes: &[u8]) -> &str {
         // Three unicode replacement characters if it fails. They look like a
         // white-on-black question mark. The user will recognize it as invalid

serde/src/lib.rs

@@ -79,7 +79,7 @@
 ////////////////////////////////////////////////////////////////////////////////
 
 // Serde types in rustdoc of other crates get linked to here.
-#![doc(html_root_url = "https://docs.rs/serde/1.0.3")]
+#![doc(html_root_url = "https://docs.rs/serde/1.0.9")]
 
 // Support using Serde without the standard library!
 #![cfg_attr(not(feature = "std"), no_std)]
@@ -91,7 +91,6 @@
 #![cfg_attr(feature = "unstable", feature(nonzero, specialization))]
 #![cfg_attr(all(feature = "std", feature = "unstable"), feature(into_boxed_c_str))]
 #![cfg_attr(feature = "alloc", feature(alloc))]
-#![cfg_attr(feature = "collections", feature(collections))]
 
 // Whitelisted clippy lints.
 #![cfg_attr(feature = "cargo-clippy", allow(doc_markdown))]
@@ -104,18 +103,15 @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
-#[cfg(feature = "collections")]
-extern crate collections;
-
 #[cfg(feature = "alloc")]
 extern crate alloc;
 
 #[cfg(all(feature = "unstable", feature = "std"))]
 extern crate core;
 
-/// A facade around all the types we need from the `std`, `core`, `alloc`, and
-/// `collections` crates. This avoids elaborate import wrangling having to
-/// happen in every module.
+/// A facade around all the types we need from the `std`, `core`, and `alloc`
+/// crates. This avoids elaborate import wrangling having to happen in every
+/// module.
 mod lib {
     mod core {
         #[cfg(feature = "std")]
@@ -140,18 +136,18 @@ mod lib {
 
     #[cfg(feature = "std")]
     pub use std::borrow::{Cow, ToOwned};
-    #[cfg(all(feature = "collections", not(feature = "std")))]
-    pub use collections::borrow::{Cow, ToOwned};
+    #[cfg(all(feature = "alloc", not(feature = "std")))]
+    pub use alloc::borrow::{Cow, ToOwned};
 
     #[cfg(feature = "std")]
     pub use std::string::String;
-    #[cfg(all(feature = "collections", not(feature = "std")))]
-    pub use collections::string::{String, ToString};
+    #[cfg(all(feature = "alloc", not(feature = "std")))]
+    pub use alloc::string::{String, ToString};
 
     #[cfg(feature = "std")]
     pub use std::vec::Vec;
-    #[cfg(all(feature = "collections", not(feature = "std")))]
-    pub use collections::vec::Vec;
+    #[cfg(all(feature = "alloc", not(feature = "std")))]
+    pub use alloc::vec::Vec;
 
     #[cfg(feature = "std")]
     pub use std::boxed::Box;
@@ -170,8 +166,8 @@ mod lib {
 
     #[cfg(feature = "std")]
     pub use std::collections::{BinaryHeap, BTreeMap, BTreeSet, LinkedList, VecDeque};
-    #[cfg(all(feature = "collections", not(feature = "std")))]
-    pub use collections::{BinaryHeap, BTreeMap, BTreeSet, LinkedList, VecDeque};
+    #[cfg(all(feature = "alloc", not(feature = "std")))]
+    pub use alloc::{BinaryHeap, BTreeMap, BTreeSet, LinkedList, VecDeque};
 
     #[cfg(feature = "std")]
     pub use std::{error, net};

serde/src/private/de.rs

@@ -10,10 +10,10 @@ use lib::*;
 
 use de::{Deserialize, Deserializer, IntoDeserializer, Error, Visitor};
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 use de::Unexpected;
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 pub use self::content::{Content, ContentRefDeserializer, ContentDeserializer,
                         TaggedContentVisitor, TagOrContentField, TagOrContentFieldVisitor,
                         TagContentOtherField, TagContentOtherFieldVisitor,
@@ -59,7 +59,7 @@ where
     Deserialize::deserialize(deserializer)
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 pub fn borrow_cow_str<'de: 'a, 'a, D>(deserializer: D) -> Result<Cow<'a, str>, D::Error>
 where
     D: Deserializer<'de>,
@@ -128,7 +128,7 @@ where
     deserializer.deserialize_str(CowStrVisitor)
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 pub fn borrow_cow_bytes<'de: 'a, 'a, D>(deserializer: D) -> Result<Cow<'a, [u8]>, D::Error>
 where
     D: Deserializer<'de>,
@@ -210,7 +210,7 @@ pub mod size_hint {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 mod content {
     // This module is private and nothing here should be used outside of
     // generated code.
@@ -233,7 +233,7 @@ mod content {
     ///
     /// Not public API. Use serde-value instead.
     #[derive(Debug)]
-    pub enum Content {
+    pub enum Content<'de> {
         Bool(bool),
 
         U8(u8),
@@ -251,18 +251,20 @@ mod content {
 
         Char(char),
         String(String),
-        Bytes(Vec<u8>),
+        Str(&'de str),
+        ByteBuf(Vec<u8>),
+        Bytes(&'de [u8]),
 
         None,
-        Some(Box<Content>),
+        Some(Box<Content<'de>>),
 
         Unit,
-        Newtype(Box<Content>),
-        Seq(Vec<Content>),
-        Map(Vec<(Content, Content)>),
+        Newtype(Box<Content<'de>>),
+        Seq(Vec<Content<'de>>),
+        Map(Vec<(Content<'de>, Content<'de>)>),
     }
 
-    impl Content {
+    impl<'de> Content<'de> {
         fn unexpected(&self) -> Unexpected {
             match *self {
                 Content::Bool(b) => Unexpected::Bool(b),
@@ -278,7 +280,9 @@ mod content {
                 Content::F64(f) => Unexpected::Float(f),
                 Content::Char(c) => Unexpected::Char(c),
                 Content::String(ref s) => Unexpected::Str(s),
-                Content::Bytes(ref b) => Unexpected::Bytes(b),
+                Content::Str(s) => Unexpected::Str(s),
+                Content::ByteBuf(ref b) => Unexpected::Bytes(b),
+                Content::Bytes(b) => Unexpected::Bytes(b),
                 Content::None | Content::Some(_) => Unexpected::Option,
                 Content::Unit => Unexpected::Unit,
                 Content::Newtype(_) => Unexpected::NewtypeStruct,
@@ -288,21 +292,30 @@ mod content {
         }
     }
 
-    impl<'de> Deserialize<'de> for Content {
+    impl<'de> Deserialize<'de> for Content<'de> {
         fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
         where
             D: Deserializer<'de>,
         {
             // Untagged and internally tagged enums are only supported in
             // self-describing formats.
-            deserializer.deserialize_any(ContentVisitor)
+            let visitor = ContentVisitor { value: PhantomData };
+            deserializer.deserialize_any(visitor)
         }
     }
 
-    struct ContentVisitor;
+    struct ContentVisitor<'de> {
+        value: PhantomData<Content<'de>>,
+    }
 
-    impl<'de> Visitor<'de> for ContentVisitor {
-        type Value = Content;
+    impl<'de> ContentVisitor<'de> {
+        fn new() -> Self {
+            ContentVisitor { value: PhantomData }
+        }
+    }
+
+    impl<'de> Visitor<'de> for ContentVisitor<'de> {
+        type Value = Content<'de>;
 
         fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
             fmt.write_str("any value")
@@ -399,6 +412,13 @@ mod content {
             Ok(Content::String(value.into()))
         }
 
+        fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F>
+        where
+            F: de::Error,
+        {
+            Ok(Content::Str(value))
+        }
+
         fn visit_string<F>(self, value: String) -> Result<Self::Value, F>
         where
             F: de::Error,
@@ -410,14 +430,21 @@ mod content {
         where
             F: de::Error,
         {
-            Ok(Content::Bytes(value.into()))
+            Ok(Content::ByteBuf(value.into()))
+        }
+
+        fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F>
+        where
+            F: de::Error,
+        {
+            Ok(Content::Bytes(value))
         }
 
         fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F>
         where
             F: de::Error,
         {
-            Ok(Content::Bytes(value))
+            Ok(Content::ByteBuf(value))
         }
 
         fn visit_unit<F>(self) -> Result<Self::Value, F>
@@ -481,23 +508,24 @@ mod content {
     /// This is the type of the map keys in an internally tagged enum.
     ///
     /// Not public API.
-    pub enum TagOrContent {
+    pub enum TagOrContent<'de> {
         Tag,
-        Content(Content),
+        Content(Content<'de>),
     }
 
-    struct TagOrContentVisitor {
+    struct TagOrContentVisitor<'de> {
         name: &'static str,
+        value: PhantomData<TagOrContent<'de>>,
     }
 
-    impl TagOrContentVisitor {
+    impl<'de> TagOrContentVisitor<'de> {
         fn new(name: &'static str) -> Self {
-            TagOrContentVisitor { name: name }
+            TagOrContentVisitor { name: name, value: PhantomData }
         }
     }
 
-    impl<'de> DeserializeSeed<'de> for TagOrContentVisitor {
-        type Value = TagOrContent;
+    impl<'de> DeserializeSeed<'de> for TagOrContentVisitor<'de> {
+        type Value = TagOrContent<'de>;
 
         fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
         where
@@ -509,8 +537,8 @@ mod content {
         }
     }
 
-    impl<'de> Visitor<'de> for TagOrContentVisitor {
-        type Value = TagOrContent;
+    impl<'de> Visitor<'de> for TagOrContentVisitor<'de> {
+        type Value = TagOrContent<'de>;
 
         fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
             write!(fmt, "a type tag `{}` or any other value", self.name)
@@ -520,7 +548,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_bool(value)
                 .map(TagOrContent::Content)
         }
@@ -529,14 +557,14 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor.visit_i8(value).map(TagOrContent::Content)
+            ContentVisitor::new().visit_i8(value).map(TagOrContent::Content)
         }
 
         fn visit_i16<F>(self, value: i16) -> Result<Self::Value, F>
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_i16(value)
                 .map(TagOrContent::Content)
         }
@@ -545,7 +573,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_i32(value)
                 .map(TagOrContent::Content)
         }
@@ -554,7 +582,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_i64(value)
                 .map(TagOrContent::Content)
         }
@@ -563,14 +591,14 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor.visit_u8(value).map(TagOrContent::Content)
+            ContentVisitor::new().visit_u8(value).map(TagOrContent::Content)
         }
 
         fn visit_u16<F>(self, value: u16) -> Result<Self::Value, F>
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_u16(value)
                 .map(TagOrContent::Content)
         }
@@ -579,7 +607,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_u32(value)
                 .map(TagOrContent::Content)
         }
@@ -588,7 +616,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_u64(value)
                 .map(TagOrContent::Content)
         }
@@ -597,7 +625,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_f32(value)
                 .map(TagOrContent::Content)
         }
@@ -606,7 +634,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_f64(value)
                 .map(TagOrContent::Content)
         }
@@ -615,7 +643,7 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_char(value)
                 .map(TagOrContent::Content)
         }
@@ -627,12 +655,25 @@ mod content {
             if value == self.name {
                 Ok(TagOrContent::Tag)
             } else {
-                ContentVisitor
+                ContentVisitor::new()
                     .visit_str(value)
                     .map(TagOrContent::Content)
             }
         }
 
+        fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F>
+        where
+            F: de::Error,
+        {
+            if value == self.name {
+                Ok(TagOrContent::Tag)
+            } else {
+                ContentVisitor::new()
+                    .visit_borrowed_str(value)
+                    .map(TagOrContent::Content)
+            }
+        }
+
         fn visit_string<F>(self, value: String) -> Result<Self::Value, F>
         where
             F: de::Error,
@@ -640,7 +681,7 @@ mod content {
             if value == self.name {
                 Ok(TagOrContent::Tag)
             } else {
-                ContentVisitor
+                ContentVisitor::new()
                     .visit_string(value)
                     .map(TagOrContent::Content)
             }
@@ -653,12 +694,25 @@ mod content {
             if value == self.name.as_bytes() {
                 Ok(TagOrContent::Tag)
             } else {
-                ContentVisitor
+                ContentVisitor::new()
                     .visit_bytes(value)
                     .map(TagOrContent::Content)
             }
         }
 
+        fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F>
+        where
+            F: de::Error,
+        {
+            if value == self.name.as_bytes() {
+                Ok(TagOrContent::Tag)
+            } else {
+                ContentVisitor::new()
+                    .visit_borrowed_bytes(value)
+                    .map(TagOrContent::Content)
+            }
+        }
+
         fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F>
         where
             F: de::Error,
@@ -666,7 +720,7 @@ mod content {
             if value == self.name.as_bytes() {
                 Ok(TagOrContent::Tag)
             } else {
-                ContentVisitor
+                ContentVisitor::new()
                     .visit_byte_buf(value)
                     .map(TagOrContent::Content)
             }
@@ -676,21 +730,21 @@ mod content {
         where
             F: de::Error,
         {
-            ContentVisitor.visit_unit().map(TagOrContent::Content)
+            ContentVisitor::new().visit_unit().map(TagOrContent::Content)
         }
 
         fn visit_none<F>(self) -> Result<Self::Value, F>
         where
             F: de::Error,
         {
-            ContentVisitor.visit_none().map(TagOrContent::Content)
+            ContentVisitor::new().visit_none().map(TagOrContent::Content)
         }
 
         fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
         where
             D: Deserializer<'de>,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_some(deserializer)
                 .map(TagOrContent::Content)
         }
@@ -699,7 +753,7 @@ mod content {
         where
             D: Deserializer<'de>,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_newtype_struct(deserializer)
                 .map(TagOrContent::Content)
         }
@@ -708,7 +762,7 @@ mod content {
         where
             V: SeqAccess<'de>,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_seq(visitor)
                 .map(TagOrContent::Content)
         }
@@ -717,7 +771,7 @@ mod content {
         where
             V: MapAccess<'de>,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_map(visitor)
                 .map(TagOrContent::Content)
         }
@@ -726,7 +780,7 @@ mod content {
         where
             V: EnumAccess<'de>,
         {
-            ContentVisitor
+            ContentVisitor::new()
                 .visit_enum(visitor)
                 .map(TagOrContent::Content)
         }
@@ -735,33 +789,33 @@ mod content {
     /// Used by generated code to deserialize an internally tagged enum.
     ///
     /// Not public API.
-    pub struct TaggedContent<T> {
+    pub struct TaggedContent<'de, T> {
         pub tag: T,
-        pub content: Content,
+        pub content: Content<'de>,
     }
 
     /// Not public API.
-    pub struct TaggedContentVisitor<T> {
+    pub struct TaggedContentVisitor<'de, T> {
         tag_name: &'static str,
-        tag: PhantomData<T>,
+        value: PhantomData<TaggedContent<'de, T>>,
     }
 
-    impl<T> TaggedContentVisitor<T> {
+    impl<'de, T> TaggedContentVisitor<'de, T> {
         /// Visitor for the content of an internally tagged enum with the given tag
         /// name.
         pub fn new(name: &'static str) -> Self {
             TaggedContentVisitor {
                 tag_name: name,
-                tag: PhantomData,
+                value: PhantomData,
             }
         }
     }
 
-    impl<'de, T> DeserializeSeed<'de> for TaggedContentVisitor<T>
+    impl<'de, T> DeserializeSeed<'de> for TaggedContentVisitor<'de, T>
     where
         T: Deserialize<'de>,
     {
-        type Value = TaggedContent<T>;
+        type Value = TaggedContent<'de, T>;
 
         fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
         where
@@ -773,11 +827,11 @@ mod content {
         }
     }
 
-    impl<'de, T> Visitor<'de> for TaggedContentVisitor<T>
+    impl<'de, T> Visitor<'de> for TaggedContentVisitor<'de, T>
     where
         T: Deserialize<'de>,
     {
-        type Value = TaggedContent<T>;
+        type Value = TaggedContent<'de, T>;
 
         fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
             fmt.write_str("any value")
@@ -913,14 +967,14 @@ mod content {
     }
 
     /// Not public API
-    pub struct ContentDeserializer<E> {
-        content: Content,
+    pub struct ContentDeserializer<'de, E> {
+        content: Content<'de>,
         err: PhantomData<E>,
     }
 
     /// Used when deserializing an internally tagged enum because the content will
     /// be used exactly once.
-    impl<'de, E> Deserializer<'de> for ContentDeserializer<E>
+    impl<'de, E> Deserializer<'de> for ContentDeserializer<'de, E>
     where
         E: de::Error,
     {
@@ -944,6 +998,9 @@ mod content {
                 Content::F64(v) => visitor.visit_f64(v),
                 Content::Char(v) => visitor.visit_char(v),
                 Content::String(v) => visitor.visit_string(v),
+                Content::Str(v) => visitor.visit_borrowed_str(v),
+                Content::ByteBuf(v) => visitor.visit_byte_buf(v),
+                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
                 Content::Unit => visitor.visit_unit(),
                 Content::None => visitor.visit_none(),
                 Content::Some(v) => visitor.visit_some(ContentDeserializer::new(*v)),
@@ -965,7 +1022,6 @@ mod content {
                     try!(map_visitor.end());
                     Ok(value)
                 }
-                Content::Bytes(v) => visitor.visit_byte_buf(v),
             }
         }
 
@@ -1026,7 +1082,7 @@ mod content {
                     }
                     (variant, Some(value))
                 }
-                Content::String(variant) => (Content::String(variant), None),
+                s @ Content::String(_) | s @ Content::Str(_) => (s, None),
                 other => {
                     return Err(de::Error::invalid_type(other.unexpected(), &"string or map"),);
                 }
@@ -1048,9 +1104,9 @@ mod content {
         }
     }
 
-    impl<E> ContentDeserializer<E> {
+    impl<'de, E> ContentDeserializer<'de, E> {
         /// private API, don't use
-        pub fn new(content: Content) -> Self {
+        pub fn new(content: Content<'de>) -> Self {
             ContentDeserializer {
                 content: content,
                 err: PhantomData,
@@ -1058,21 +1114,21 @@ mod content {
         }
     }
 
-    struct EnumDeserializer<E>
+    struct EnumDeserializer<'de, E>
     where
         E: de::Error,
     {
-        variant: Content,
-        value: Option<Content>,
+        variant: Content<'de>,
+        value: Option<Content<'de>>,
         err: PhantomData<E>,
     }
 
-    impl<'de, E> de::EnumAccess<'de> for EnumDeserializer<E>
+    impl<'de, E> de::EnumAccess<'de> for EnumDeserializer<'de, E>
     where
         E: de::Error,
     {
         type Error = E;
-        type Variant = VariantDeserializer<Self::Error>;
+        type Variant = VariantDeserializer<'de, Self::Error>;
 
         fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), E>
         where
@@ -1087,15 +1143,15 @@ mod content {
         }
     }
 
-    struct VariantDeserializer<E>
+    struct VariantDeserializer<'de, E>
     where
         E: de::Error,
     {
-        value: Option<Content>,
+        value: Option<Content<'de>>,
         err: PhantomData<E>,
     }
 
-    impl<'de, E> de::VariantAccess<'de> for VariantDeserializer<E>
+    impl<'de, E> de::VariantAccess<'de> for VariantDeserializer<'de, E>
     where
         E: de::Error,
     {
@@ -1151,19 +1207,19 @@ mod content {
         }
     }
 
-    struct SeqDeserializer<E>
+    struct SeqDeserializer<'de, E>
     where
         E: de::Error,
     {
-        iter: <Vec<Content> as IntoIterator>::IntoIter,
+        iter: <Vec<Content<'de>> as IntoIterator>::IntoIter,
         err: PhantomData<E>,
     }
 
-    impl<E> SeqDeserializer<E>
+    impl<'de, E> SeqDeserializer<'de, E>
     where
         E: de::Error,
     {
-        fn new(vec: Vec<Content>) -> Self {
+        fn new(vec: Vec<Content<'de>>) -> Self {
             SeqDeserializer {
                 iter: vec.into_iter(),
                 err: PhantomData,
@@ -1171,7 +1227,7 @@ mod content {
         }
     }
 
-    impl<'de, E> de::Deserializer<'de> for SeqDeserializer<E>
+    impl<'de, E> de::Deserializer<'de> for SeqDeserializer<'de, E>
     where
         E: de::Error,
     {
@@ -1203,7 +1259,7 @@ mod content {
         }
     }
 
-    impl<'de, E> de::SeqAccess<'de> for SeqDeserializer<E>
+    impl<'de, E> de::SeqAccess<'de> for SeqDeserializer<'de, E>
     where
         E: de::Error,
     {
@@ -1227,20 +1283,20 @@ mod content {
         }
     }
 
-    struct MapDeserializer<E>
+    struct MapDeserializer<'de, E>
     where
         E: de::Error,
     {
-        iter: <Vec<(Content, Content)> as IntoIterator>::IntoIter,
-        value: Option<Content>,
+        iter: <Vec<(Content<'de>, Content<'de>)> as IntoIterator>::IntoIter,
+        value: Option<Content<'de>>,
         err: PhantomData<E>,
     }
 
-    impl<E> MapDeserializer<E>
+    impl<'de, E> MapDeserializer<'de, E>
     where
         E: de::Error,
     {
-        fn new(map: Vec<(Content, Content)>) -> Self {
+        fn new(map: Vec<(Content<'de>, Content<'de>)>) -> Self {
             MapDeserializer {
                 iter: map.into_iter(),
                 value: None,
@@ -1249,7 +1305,7 @@ mod content {
         }
     }
 
-    impl<'de, E> de::MapAccess<'de> for MapDeserializer<E>
+    impl<'de, E> de::MapAccess<'de> for MapDeserializer<'de, E>
     where
         E: de::Error,
     {
@@ -1283,7 +1339,7 @@ mod content {
         }
     }
 
-    impl<'de, E> de::Deserializer<'de> for MapDeserializer<E>
+    impl<'de, E> de::Deserializer<'de> for MapDeserializer<'de, E>
     where
         E: de::Error,
     {
@@ -1305,14 +1361,14 @@ mod content {
     }
 
     /// Not public API.
-    pub struct ContentRefDeserializer<'a, E> {
-        content: &'a Content,
+    pub struct ContentRefDeserializer<'a, 'de: 'a, E> {
+        content: &'a Content<'de>,
         err: PhantomData<E>,
     }
 
     /// Used when deserializing an untagged enum because the content may need to be
     /// used more than once.
-    impl<'de, 'a, E> Deserializer<'de> for ContentRefDeserializer<'a, E>
+    impl<'de, 'a, E> Deserializer<'de> for ContentRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
@@ -1336,6 +1392,9 @@ mod content {
                 Content::F64(v) => visitor.visit_f64(v),
                 Content::Char(v) => visitor.visit_char(v),
                 Content::String(ref v) => visitor.visit_str(v),
+                Content::Str(v) => visitor.visit_borrowed_str(v),
+                Content::ByteBuf(ref v) => visitor.visit_bytes(v),
+                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
                 Content::Unit => visitor.visit_unit(),
                 Content::None => visitor.visit_none(),
                 Content::Some(ref v) => visitor.visit_some(ContentRefDeserializer::new(v)),
@@ -1361,7 +1420,6 @@ mod content {
                     try!(map_visitor.end());
                     Ok(value)
                 }
-                Content::Bytes(ref v) => visitor.visit_bytes(v),
             }
         }
 
@@ -1418,7 +1476,7 @@ mod content {
                     }
                     (variant, Some(value))
                 }
-                ref s @ Content::String(_) => (s, None),
+                ref s @ Content::String(_) | ref s @ Content::Str(_) => (s, None),
                 ref other => {
                     return Err(de::Error::invalid_type(other.unexpected(), &"string or map"),);
                 }
@@ -1440,9 +1498,9 @@ mod content {
         }
     }
 
-    impl<'a, E> ContentRefDeserializer<'a, E> {
+    impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E> {
         /// private API, don't use
-        pub fn new(content: &'a Content) -> Self {
+        pub fn new(content: &'a Content<'de>) -> Self {
             ContentRefDeserializer {
                 content: content,
                 err: PhantomData,
@@ -1450,21 +1508,21 @@ mod content {
         }
     }
 
-    struct EnumRefDeserializer<'a, E>
+    struct EnumRefDeserializer<'a, 'de: 'a, E>
     where
         E: de::Error,
     {
-        variant: &'a Content,
-        value: Option<&'a Content>,
+        variant: &'a Content<'de>,
+        value: Option<&'a Content<'de>>,
         err: PhantomData<E>,
     }
 
-    impl<'de, 'a, E> de::EnumAccess<'de> for EnumRefDeserializer<'a, E>
+    impl<'de, 'a, E> de::EnumAccess<'de> for EnumRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
         type Error = E;
-        type Variant = VariantRefDeserializer<'a, Self::Error>;
+        type Variant = VariantRefDeserializer<'a, 'de, Self::Error>;
 
         fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Self::Error>
         where
@@ -1479,15 +1537,15 @@ mod content {
         }
     }
 
-    struct VariantRefDeserializer<'a, E>
+    struct VariantRefDeserializer<'a, 'de: 'a, E>
     where
         E: de::Error,
     {
-        value: Option<&'a Content>,
+        value: Option<&'a Content<'de>>,
         err: PhantomData<E>,
     }
 
-    impl<'de, 'a, E> de::VariantAccess<'de> for VariantRefDeserializer<'a, E>
+    impl<'de, 'a, E> de::VariantAccess<'de> for VariantRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
@@ -1543,19 +1601,19 @@ mod content {
         }
     }
 
-    struct SeqRefDeserializer<'a, E>
+    struct SeqRefDeserializer<'a, 'de: 'a, E>
     where
         E: de::Error,
     {
-        iter: <&'a [Content] as IntoIterator>::IntoIter,
+        iter: <&'a [Content<'de>] as IntoIterator>::IntoIter,
         err: PhantomData<E>,
     }
 
-    impl<'a, E> SeqRefDeserializer<'a, E>
+    impl<'a, 'de, E> SeqRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
-        fn new(vec: &'a [Content]) -> Self {
+        fn new(vec: &'a [Content<'de>]) -> Self {
             SeqRefDeserializer {
                 iter: vec.into_iter(),
                 err: PhantomData,
@@ -1563,7 +1621,7 @@ mod content {
         }
     }
 
-    impl<'de, 'a, E> de::Deserializer<'de> for SeqRefDeserializer<'a, E>
+    impl<'de, 'a, E> de::Deserializer<'de> for SeqRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
@@ -1595,7 +1653,7 @@ mod content {
         }
     }
 
-    impl<'de, 'a, E> de::SeqAccess<'de> for SeqRefDeserializer<'a, E>
+    impl<'de, 'a, E> de::SeqAccess<'de> for SeqRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
@@ -1619,20 +1677,20 @@ mod content {
         }
     }
 
-    struct MapRefDeserializer<'a, E>
+    struct MapRefDeserializer<'a, 'de: 'a, E>
     where
         E: de::Error,
     {
-        iter: <&'a [(Content, Content)] as IntoIterator>::IntoIter,
-        value: Option<&'a Content>,
+        iter: <&'a [(Content<'de>, Content<'de>)] as IntoIterator>::IntoIter,
+        value: Option<&'a Content<'de>>,
         err: PhantomData<E>,
     }
 
-    impl<'a, E> MapRefDeserializer<'a, E>
+    impl<'a, 'de, E> MapRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
-        fn new(map: &'a [(Content, Content)]) -> Self {
+        fn new(map: &'a [(Content<'de>, Content<'de>)]) -> Self {
             MapRefDeserializer {
                 iter: map.into_iter(),
                 value: None,
@@ -1641,7 +1699,7 @@ mod content {
         }
     }
 
-    impl<'de, 'a, E> de::MapAccess<'de> for MapRefDeserializer<'a, E>
+    impl<'de, 'a, E> de::MapAccess<'de> for MapRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
@@ -1676,7 +1734,7 @@ mod content {
         }
     }
 
-    impl<'de, 'a, E> de::Deserializer<'de> for MapRefDeserializer<'a, E>
+    impl<'de, 'a, E> de::Deserializer<'de> for MapRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {
@@ -1697,7 +1755,7 @@ mod content {
         }
     }
 
-    impl<'de, E> de::IntoDeserializer<'de, E> for ContentDeserializer<E>
+    impl<'de, E> de::IntoDeserializer<'de, E> for ContentDeserializer<'de, E>
     where
         E: de::Error,
     {
@@ -1708,7 +1766,7 @@ mod content {
         }
     }
 
-    impl<'de, 'a, E> de::IntoDeserializer<'de, E> for ContentRefDeserializer<'a, E>
+    impl<'de, 'a, E> de::IntoDeserializer<'de, E> for ContentRefDeserializer<'a, 'de, E>
     where
         E: de::Error,
     {

serde/src/private/ser.rs

@@ -10,7 +10,7 @@ use lib::*;
 
 use ser::{self, Serialize, Serializer, SerializeMap, SerializeStruct, Impossible};
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 use self::content::{SerializeTupleVariantAsMapValue, SerializeStructVariantAsMapValue};
 
 /// Used to check that serde(getter) attributes return the expected type.
@@ -64,7 +64,7 @@ enum Unsupported {
     Sequence,
     Tuple,
     TupleStruct,
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     Enum,
 }
 
@@ -83,7 +83,7 @@ impl Display for Unsupported {
             Unsupported::Sequence => formatter.write_str("a sequence"),
             Unsupported::Tuple => formatter.write_str("a tuple"),
             Unsupported::TupleStruct => formatter.write_str("a tuple struct"),
-            #[cfg(not(any(feature = "std", feature = "collections")))]
+            #[cfg(not(any(feature = "std", feature = "alloc")))]
             Unsupported::Enum => formatter.write_str("an enum"),
         }
     }
@@ -117,14 +117,14 @@ where
     type SerializeMap = S::SerializeMap;
     type SerializeStruct = S::SerializeStruct;
 
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     type SerializeTupleVariant = Impossible<S::Ok, S::Error>;
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     type SerializeTupleVariant = SerializeTupleVariantAsMapValue<S::SerializeMap>;
 
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     type SerializeStructVariant = Impossible<S::Ok, S::Error>;
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     type SerializeStructVariant = SerializeStructVariantAsMapValue<S::SerializeMap>;
 
     fn serialize_bool(self, _: bool) -> Result<Self::Ok, Self::Error> {
@@ -257,7 +257,7 @@ where
         Err(self.bad_type(Unsupported::TupleStruct))
     }
 
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     fn serialize_tuple_variant(
         self,
         _: &'static str,
@@ -270,7 +270,7 @@ where
         Err(self.bad_type(Unsupported::Enum))
     }
 
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     fn serialize_tuple_variant(
         self,
         _: &'static str,
@@ -300,7 +300,7 @@ where
         Ok(state)
     }
 
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     fn serialize_struct_variant(
         self,
         _: &'static str,
@@ -313,7 +313,7 @@ where
         Err(self.bad_type(Unsupported::Enum))
     }
 
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     fn serialize_struct_variant(
         self,
         _: &'static str,
@@ -327,7 +327,7 @@ where
         Ok(SerializeStructVariantAsMapValue::new(map, inner_variant, len),)
     }
 
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     fn collect_str<T: ?Sized>(self, _: &T) -> Result<Self::Ok, Self::Error>
     where
         T: Display,
@@ -363,7 +363,7 @@ impl Display for Error {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 mod content {
     use lib::*;
 

serde/src/ser/impls.rs

@@ -56,7 +56,7 @@ impl Serialize for str {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 impl Serialize for String {
     #[inline]
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
@@ -177,6 +177,7 @@ where
     }
 }
 
+#[cfg(any(feature = "std", feature = "alloc"))]
 macro_rules! seq_impl {
     ($ty:ident < T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound:ident)* >) => {
         impl<T $(, $typaram)*> Serialize for $ty<T $(, $typaram)*>
@@ -195,22 +196,22 @@ macro_rules! seq_impl {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(BinaryHeap<T: Ord>);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(BTreeSet<T: Ord>);
 
 #[cfg(feature = "std")]
 seq_impl!(HashSet<T: Eq + Hash, H: BuildHasher>);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(LinkedList<T>);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(Vec<T>);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 seq_impl!(VecDeque<T>);
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -290,6 +291,7 @@ tuple_impls! {
 
 ////////////////////////////////////////////////////////////////////////////////
 
+#[cfg(any(feature = "std", feature = "alloc"))]
 macro_rules! map_impl {
     ($ty:ident < K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound:ident)* >) => {
         impl<K, V $(, $typaram)*> Serialize for $ty<K, V $(, $typaram)*>
@@ -309,7 +311,7 @@ macro_rules! map_impl {
     }
 }
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 map_impl!(BTreeMap<K: Ord, V>);
 
 #[cfg(feature = "std")]
@@ -343,7 +345,7 @@ deref_impl!(<T> Serialize for Rc<T> where T: Serialize);
 #[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))]
 deref_impl!(<T> Serialize for Arc<T> where T: Serialize);
 
-#[cfg(any(feature = "std", feature = "collections"))]
+#[cfg(any(feature = "std", feature = "alloc"))]
 deref_impl!(<'a, T: ?Sized> Serialize for Cow<'a, T> where T: Serialize + ToOwned);
 
 ////////////////////////////////////////////////////////////////////////////////

serde/src/ser/mod.rs

@@ -1321,7 +1321,7 @@ pub trait Serializer: Sized {
     ///
     /// [`String`]: https://doc.rust-lang.org/std/string/struct.String.html
     /// [`serialize_str`]: #tymethod.serialize_str
-    #[cfg(any(feature = "std", feature = "collections"))]
+    #[cfg(any(feature = "std", feature = "alloc"))]
     fn collect_str<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
     where
         T: Display,
@@ -1358,7 +1358,7 @@ pub trait Serializer: Sized {
     ///     }
     /// }
     /// ```
-    #[cfg(not(any(feature = "std", feature = "collections")))]
+    #[cfg(not(any(feature = "std", feature = "alloc")))]
     fn collect_str<T: ?Sized>(self, value: &T) -> Result<Self::Ok, Self::Error>
     where
         T: Display;

serde_derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_derive"
-version = "1.0.3" # remember to update html_root_url
+version = "1.0.9" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros 1.1 implementation of #[derive(Serialize, Deserialize)]"
@@ -20,5 +20,5 @@ proc-macro = true
 
 [dependencies]
 quote = "0.3.8"
-serde_derive_internals = { version = "=0.15.0", default-features = false, path = "../serde_derive_internals" }
+serde_derive_internals = { version = "=0.15.1", default-features = false, path = "../serde_derive_internals" }
 syn = { version = "0.11", features = ["visit"] }

serde_derive/src/de.rs

@@ -23,15 +23,14 @@ pub fn expand_derive_deserialize(input: &syn::DeriveInput) -> Result<Tokens, Str
 
     let ident = &cont.ident;
     let params = Parameters::new(&cont);
+    let (de_impl_generics, _, ty_generics, where_clause) = split_with_de_lifetime(&params);
     let dummy_const = Ident::new(format!("_IMPL_DESERIALIZE_FOR_{}", ident));
     let body = Stmts(deserialize_body(&cont, &params));
 
     let impl_block = if let Some(remote) = cont.attrs.remote() {
-        let (impl_generics, ty_generics, where_clause) = cont.generics.split_for_impl();
-        let de_lifetime = params.de_lifetime_def();
         quote! {
-            impl #impl_generics #ident #ty_generics #where_clause {
-                fn deserialize<#de_lifetime, __D>(__deserializer: __D) -> _serde::export::Result<#remote #ty_generics, __D::Error>
+            impl #de_impl_generics #ident #ty_generics #where_clause {
+                fn deserialize<__D>(__deserializer: __D) -> _serde::export::Result<#remote #ty_generics, __D::Error>
                     where __D: _serde::Deserializer<'de>
                 {
                     #body
@@ -39,7 +38,6 @@ pub fn expand_derive_deserialize(input: &syn::DeriveInput) -> Result<Tokens, Str
             }
         }
     } else {
-        let (de_impl_generics, _, ty_generics, where_clause) = split_with_de_lifetime(&params);
         quote! {
             #[automatically_derived]
             impl #de_impl_generics _serde::Deserialize<'de> for #ident #ty_generics #where_clause {

serde_derive/src/lib.rs

@@ -16,7 +16,7 @@
 //!
 //! [https://serde.rs/derive.html]: https://serde.rs/derive.html
 
-#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.3")]
+#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.9")]
 
 #![cfg_attr(feature = "cargo-clippy", allow(too_many_arguments))]
 #![cfg_attr(feature = "cargo-clippy", allow(used_underscore_binding))]

serde_derive_internals/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_derive_internals"
-version = "0.15.0" # remember to update html_root_url
+version = "0.15.1" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "AST representation used by Serde derive macros. Unstable."

serde_derive_internals/src/attr.rs

@@ -719,6 +719,12 @@ impl Field {
                         skip_deserializing.set_true();
                     }
 
+                    // Parse `#[serde(skip)]`
+                    MetaItem(Word(ref name)) if name == "skip" => {
+                        skip_serializing.set_true();
+                        skip_deserializing.set_true();
+                    },
+
                     // Parse `#[serde(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) {

serde_derive_internals/src/lib.rs

@@ -6,7 +6,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![doc(html_root_url = "https://docs.rs/serde_derive_internals/0.15.0")]
+#![doc(html_root_url = "https://docs.rs/serde_derive_internals/0.15.1")]
 
 extern crate syn;
 #[macro_use]

serde_test/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_test"
-version = "1.0.3" # remember to update html_root_url
+version = "1.0.9" # remember to update html_root_url
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>", "David Tolnay <dtolnay@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Token De/Serializer for testing De/Serialize implementations"

serde_test/src/lib.rs

@@ -155,7 +155,7 @@
 //! # }
 //! ```
 
-#![doc(html_root_url = "https://docs.rs/serde_test/1.0.3")]
+#![doc(html_root_url = "https://docs.rs/serde_test/1.0.9")]
 
 #[macro_use]
 extern crate serde;

test_suite/tests/test_annotations.rs

@@ -580,6 +580,41 @@ fn test_skip_serializing_struct() {
     );
 }
 
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+struct SkipStruct<B>
+{
+    a: i8,
+    #[serde(skip)]
+    b: B,
+}
+
+#[test]
+fn test_skip_struct() {
+    assert_ser_tokens(
+        &SkipStruct { a: 1, b: 2 },
+        &[
+            Token::Struct { name: "SkipStruct", len: 1 },
+
+            Token::Str("a"),
+            Token::I8(1),
+
+            Token::StructEnd,
+        ],
+    );
+
+    assert_de_tokens(
+        &SkipStruct { a: 1, b: 0 },
+        &[
+            Token::Struct { name: "SkipStruct", len: 1 },
+
+            Token::Str("a"),
+            Token::I8(1),
+
+            Token::StructEnd,
+        ],
+    );
+}
+
 #[derive(Debug, PartialEq, Serialize)]
 enum SkipSerializingEnum<'a, B, C>
 where

test_suite/tests/test_gen.rs

@@ -330,6 +330,34 @@ fn test_gen() {
     struct EmptyArray {
         empty: [X; 0],
     }
+
+    enum Or<A, B> {
+        A(A),
+        B(B),
+    }
+
+    #[derive(Serialize, Deserialize)]
+    #[serde(untagged, remote = "Or")]
+    enum OrDef<A, B> {
+        #[allow(dead_code)]
+        A(A),
+        #[allow(dead_code)]
+        B(B),
+    }
+
+    struct Str<'a>(&'a str);
+
+    #[derive(Serialize, Deserialize)]
+    #[serde(remote = "Str")]
+    struct StrDef<'a>(&'a str);
+
+    #[derive(Serialize, Deserialize)]
+    struct Remote<'a> {
+        #[serde(with = "OrDef")]
+        or: Or<u8, bool>,
+        #[serde(borrow, with = "StrDef")]
+        s: Str<'a>,
+    }
 }
 
 //////////////////////////////////////////////////////////////////////////

test_suite/tests/test_macros.rs

@@ -695,6 +695,59 @@ fn test_internally_tagged_enum() {
     );
 }
 
+#[test]
+fn test_internally_tagged_struct_variant_containing_unit_variant() {
+    #[derive(Debug, PartialEq, Serialize, Deserialize)]
+    pub enum Level {
+        Info,
+    }
+
+    #[derive(Debug, PartialEq, Serialize, Deserialize)]
+    #[serde(tag = "action")]
+    pub enum Message {
+        Log { level: Level },
+    }
+
+    assert_de_tokens(
+        &Message::Log { level: Level::Info },
+        &[
+            Token::Struct { name: "Message", len: 2 },
+
+            Token::Str("action"),
+            Token::Str("Log"),
+
+            Token::Str("level"),
+            Token::BorrowedStr("Info"),
+
+            Token::StructEnd,
+        ],
+    );
+}
+
+#[test]
+fn test_internally_tagged_borrow() {
+    #[derive(Debug, PartialEq, Serialize, Deserialize)]
+    #[serde(tag = "type")]
+    pub enum Input<'a> {
+        Package { name: &'a str },
+    }
+
+    assert_tokens(
+        &Input::Package { name: "borrowed" },
+        &[
+            Token::Struct { name: "Input", len: 2 },
+
+            Token::BorrowedStr("type"),
+            Token::BorrowedStr("Package"),
+
+            Token::BorrowedStr("name"),
+            Token::BorrowedStr("borrowed"),
+
+            Token::StructEnd,
+        ],
+    );
+}
+
 #[test]
 fn test_adjacently_tagged_enum() {
     #[derive(Debug, PartialEq, Serialize, Deserialize)]

travis.sh

@@ -46,7 +46,6 @@ else
     channel build
     channel build --no-default-features
     channel build --no-default-features --features alloc
-    channel build --no-default-features --features collections
     channel test --features 'rc unstable'
     cd "$DIR/test_suite/deps"
     channel build