Release 1.0.24

Solved #1105.

serde/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde"
-version = "1.0.22" # remember to update html_root_url
+version = "1.0.24" # 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"

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/1.0.22")]
+#![doc(html_root_url = "https://docs.rs/serde/1.0.24")]
 
 // Support using Serde without the standard library!
 #![cfg_attr(not(feature = "std"), no_std)]

serde/src/private/de.rs

@@ -198,6 +198,7 @@ pub mod size_hint {
         helper(iter.size_hint())
     }
 
+    #[inline]
     pub fn cautious(hint: Option<usize>) -> usize {
         cmp::min(hint.unwrap_or(0), 4096)
     }

serde_derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_derive"
-version = "1.0.22" # remember to update html_root_url
+version = "1.0.24" # 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)]"
@@ -20,7 +20,7 @@ proc-macro = true
 
 [dependencies]
 quote = "0.3.8"
-serde_derive_internals = { version = "=0.17.0", default-features = false, path = "../serde_derive_internals" }
+serde_derive_internals = { version = "=0.18.0", default-features = false, path = "../serde_derive_internals" }
 syn = { version = "0.11", features = ["visit"] }
 
 [dev-dependencies]

serde_derive/src/de.rs

@@ -447,7 +447,30 @@ fn deserialize_seq(
         };
     }
 
+    let let_default = match *cattrs.default() {
+        attr::Default::Default => {
+            Some(
+                quote!(
+                    let __default: Self::Value = _serde::export::Default::default();
+                ),
+            )
+        }
+        attr::Default::Path(ref path) => {
+            Some(
+                quote!(
+                    let __default: Self::Value = #path();
+                ),
+            )
+        }
+        attr::Default::None => {
+            // We don't need the default value, to prevent an unused variable warning
+            // we'll leave the line empty.
+            None
+        }
+    };
+
     quote_block! {
+        #let_default
         #(#let_values)*
         _serde::export::Ok(#result)
     }
@@ -1701,15 +1724,15 @@ fn deserialize_map(
         attr::Default::Default => {
             Some(
                 quote!(
-                let __default: Self::Value = _serde::export::Default::default();
-            ),
+                    let __default: Self::Value = _serde::export::Default::default();
+                ),
             )
         }
         attr::Default::Path(ref path) => {
             Some(
                 quote!(
-                let __default: Self::Value = #path();
-            ),
+                    let __default: Self::Value = #path();
+                ),
             )
         }
         attr::Default::None => {

serde_derive/src/lib.rs

@@ -22,7 +22,7 @@
 //!
 //! [https://serde.rs/derive.html]: https://serde.rs/derive.html
 
-#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.22")]
+#![doc(html_root_url = "https://docs.rs/serde_derive/1.0.24")]
 
 #![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 = "0.17.0" # remember to update html_root_url
+version = "0.18.0" # 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/ast.rs

@@ -49,9 +49,11 @@ impl<'a> Container<'a> {
         let attrs = attr::Container::from_ast(cx, item);
 
         let mut body = match item.body {
-            syn::Body::Enum(ref variants) => Body::Enum(enum_from_ast(cx, variants)),
+            syn::Body::Enum(ref variants) => {
+                Body::Enum(enum_from_ast(cx, variants, &attrs.default()))
+            }
             syn::Body::Struct(ref variant_data) => {
-                let (style, fields) = struct_from_ast(cx, variant_data, None);
+                let (style, fields) = struct_from_ast(cx, variant_data, None, &attrs.default());
                 Body::Struct(style, fields)
             }
         };
@@ -98,36 +100,54 @@ impl<'a> Body<'a> {
     }
 }
 
-fn enum_from_ast<'a>(cx: &Ctxt, variants: &'a [syn::Variant]) -> Vec<Variant<'a>> {
+fn enum_from_ast<'a>(
+    cx: &Ctxt,
+    variants: &'a [syn::Variant],
+    container_default: &attr::Default,
+) -> Vec<Variant<'a>> {
     variants
         .iter()
-        .map(
-            |variant| {
-                let attrs = attr::Variant::from_ast(cx, variant);
-                let (style, fields) = struct_from_ast(cx, &variant.data, Some(&attrs));
-                Variant {
-                    ident: variant.ident.clone(),
-                    attrs: attrs,
-                    style: style,
-                    fields: fields,
-                }
-            },
-        )
+        .map(|variant| {
+            let attrs = attr::Variant::from_ast(cx, variant);
+            let (style, fields) =
+                struct_from_ast(cx, &variant.data, Some(&attrs), container_default);
+            Variant {
+                ident: variant.ident.clone(),
+                attrs: attrs,
+                style: style,
+                fields: fields,
+            }
+        })
         .collect()
 }
 
-fn struct_from_ast<'a>(cx: &Ctxt, data: &'a syn::VariantData, attrs: Option<&attr::Variant>) -> (Style, Vec<Field<'a>>) {
+fn struct_from_ast<'a>(
+    cx: &Ctxt,
+    data: &'a syn::VariantData,
+    attrs: Option<&attr::Variant>,
+    container_default: &attr::Default,
+) -> (Style, Vec<Field<'a>>) {
     match *data {
-        syn::VariantData::Struct(ref fields) => (Style::Struct, fields_from_ast(cx, fields, attrs)),
-        syn::VariantData::Tuple(ref fields) if fields.len() == 1 => {
-            (Style::Newtype, fields_from_ast(cx, fields, attrs))
+        syn::VariantData::Struct(ref fields) => {
+            (Style::Struct, fields_from_ast(cx, fields, attrs, container_default))
+        }
+        syn::VariantData::Tuple(ref fields) if fields.len() == 1 => (
+            Style::Newtype,
+            fields_from_ast(cx, fields, attrs, container_default),
+        ),
+        syn::VariantData::Tuple(ref fields) => {
+            (Style::Tuple, fields_from_ast(cx, fields, attrs, container_default))
         }
-        syn::VariantData::Tuple(ref fields) => (Style::Tuple, fields_from_ast(cx, fields, attrs)),
         syn::VariantData::Unit => (Style::Unit, Vec::new()),
     }
 }
 
-fn fields_from_ast<'a>(cx: &Ctxt, fields: &'a [syn::Field], attrs: Option<&attr::Variant>) -> Vec<Field<'a>> {
+fn fields_from_ast<'a>(
+    cx: &Ctxt,
+    fields: &'a [syn::Field],
+    attrs: Option<&attr::Variant>,
+    container_default: &attr::Default,
+) -> Vec<Field<'a>> {
     fields
         .iter()
         .enumerate()
@@ -135,7 +155,7 @@ fn fields_from_ast<'a>(cx: &Ctxt, fields: &'a [syn::Field], attrs: Option<&attr:
             |(i, field)| {
                 Field {
                     ident: field.ident.clone(),
-                    attrs: attr::Field::from_ast(cx, i, field, attrs),
+                    attrs: attr::Field::from_ast(cx, i, field, attrs, container_default),
                     ty: &field.ty,
                 }
             },

serde_derive_internals/src/attr.rs

@@ -714,7 +714,13 @@ pub enum Default {
 
 impl Field {
     /// Extract out the `#[serde(...)]` attributes from a struct field.
-    pub fn from_ast(cx: &Ctxt, index: usize, field: &syn::Field, attrs: Option<&Variant>) -> Self {
+    pub fn from_ast(
+        cx: &Ctxt,
+        index: usize,
+        field: &syn::Field,
+        attrs: Option<&Variant>,
+        container_default: &Default,
+    ) -> Self {
         let mut ser_name = Attr::none(cx, "rename");
         let mut de_name = Attr::none(cx, "rename");
         let mut skip_serializing = BoolAttr::none(cx, "skip_serializing");
@@ -881,9 +887,10 @@ impl Field {
             }
         }
 
-        // Is skip_deserializing, initialize the field to Default::default()
-        // unless a different default is specified by `#[serde(default = "...")]`
-        if skip_deserializing.0.value.is_some() {
+        // Is skip_deserializing, initialize the field to Default::default() unless a different
+        // default is specified by `#[serde(default = "...")]` on ourselves or our container (e.g.
+        // the struct we are in).
+        if container_default == &Default::None && skip_deserializing.0.value.is_some() {
             default.set_if_none(Default::Default);
         }
 

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/0.17.0")]
+#![doc(html_root_url = "https://docs.rs/serde_derive_internals/0.18.0")]
 
 extern crate syn;
 #[macro_use]

serde_test/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_test"
-version = "1.0.22" # remember to update html_root_url
+version = "1.0.24" # 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/configure.rs

@@ -11,17 +11,17 @@ pub struct Compact<T: ?Sized>(T);
 
 /// Trait to determine whether a value is represented in human-readable or
 /// compact form.
-/// 
+///
 /// ```
 /// extern crate serde;
 /// extern crate serde_test;
-/// 
+///
 /// use serde::{Deserialize, Deserializer, Serialize, Serializer};
 /// use serde_test::{Configure, Token, assert_tokens};
-/// 
+///
 /// #[derive(Debug, PartialEq)]
 /// struct Example(u8, u8);
-/// 
+///
 /// impl Serialize for Example {
 ///     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
 ///         where S: Serializer,
@@ -33,7 +33,7 @@ pub struct Compact<T: ?Sized>(T);
 ///         }
 ///     }
 /// }
-/// 
+///
 /// impl<'de> Deserialize<'de> for Example {
 ///     fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
 ///         where D: Deserializer<'de>,
@@ -52,7 +52,7 @@ pub struct Compact<T: ?Sized>(T);
 ///         }
 ///     }
 /// }
-/// 
+///
 /// fn main() {
 ///     assert_tokens(
 ///         &Example(1, 0).compact(),

serde_test/src/de.rs

@@ -352,8 +352,8 @@ impl<'de, 'a> de::Deserializer<'de> for &'a mut Deserializer<'de> {
         V: Visitor<'de>,
     {
         match self.peek_token() {
-            Token::Struct { .. } => {
-                assert_next_token!(self, Token::Struct { name: name, len: fields.len() });
+            Token::Struct { len: n, .. } => {
+                assert_next_token!(self, Token::Struct { name: name, len: n });
                 self.visit_map(Some(fields.len()), Token::StructEnd, visitor)
             }
             Token::Map { .. } => {

serde_test/src/lib.rs

@@ -155,7 +155,7 @@
 //! # }
 //! ```
 
-#![doc(html_root_url = "https://docs.rs/serde_test/1.0.22")]
+#![doc(html_root_url = "https://docs.rs/serde_test/1.0.24")]
 
 #![cfg_attr(feature = "cargo-clippy", deny(clippy, clippy_pedantic))]
 // Whitelisted clippy lints

serde_test/src/token.rs

@@ -425,10 +425,6 @@ pub enum Token {
 
     /// The header of a struct.
     ///
-    /// When testing deserialization, the `len` field must match the number of
-    /// fields that the struct expects to deserialize. This may be different
-    /// from the number of fields contained in the input tokens.
-    ///
     /// After this header are the fields of the struct, followed by `StructEnd`.
     ///
     /// ```rust
@@ -465,10 +461,6 @@ pub enum Token {
 
     /// The header of a struct variant of an enum.
     ///
-    /// When testing deserialization, the `len` field must match the number of
-    /// fields that the struct variant expects to deserialize. This may be
-    /// different from the number of fields contained in the input tokens.
-    ///
     /// After this header are the fields of the struct variant, followed by
     /// `StructVariantEnd`.
     ///

test_suite/tests/test_de.rs

@@ -80,6 +80,20 @@ struct StructSkipAll {
     #[serde(skip_deserializing)] a: i32,
 }
 
+#[derive(PartialEq, Debug, Deserialize)]
+#[serde(default)]
+struct StructSkipDefault {
+    #[serde(skip_deserializing)] a: i32,
+}
+
+impl Default for StructSkipDefault {
+    fn default() -> Self {
+        StructSkipDefault {
+            a: 16,
+        }
+    }
+}
+
 #[derive(PartialEq, Debug, Deserialize)]
 #[serde(deny_unknown_fields)]
 struct StructSkipAllDenyUnknown {
@@ -600,6 +614,12 @@ declare_tests! {
             Token::StructEnd,
         ],
     }
+    test_struct_skip_default {
+        StructSkipDefault { a: 16 } => &[
+            Token::Struct { name: "StructSkipDefault", len: 0 },
+            Token::StructEnd,
+        ],
+    }
     test_struct_skip_all_deny_unknown {
         StructSkipAllDenyUnknown { a: 0 } => &[
             Token::Struct { name: "StructSkipAllDenyUnknown", len: 0 },