Version bump

This allows file formats like bincode, which do not encode it's values
with a type tag, to deserialize values.

README.md

@@ -174,7 +174,7 @@ impl<K, V, I> MapVisitor for MapIteratorVisitor<I>
 ```
 
 Serializing structs follow this same pattern. In fact, structs are represented
-as a named map. It's visitor uses a simple state machine to iterate through all
+as a named map. Its visitor uses a simple state machine to iterate through all
 the fields:
 
 ```rust

serde/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde"
-version = "0.4.1"
+version = "0.4.3"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"
@@ -11,3 +11,7 @@ keywords = ["serialization"]
 
 [dependencies]
 num = "*"
+
+[features]
+nightly = []
+

serde/src/de/impls.rs

@@ -1,4 +1,17 @@
-use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
+use std::borrow::Cow;
+use std::collections::{
+    BinaryHeap,
+    BTreeMap,
+    BTreeSet,
+    LinkedList,
+    HashMap,
+    HashSet,
+    VecDeque,
+};
+#[cfg(feature = "nightly")]
+use collections::enum_set::{CLike, EnumSet};
+#[cfg(feature = "nightly")]
+use collections::vec_map::VecMap;
 use std::hash::Hash;
 use std::marker::PhantomData;
 use std::path;
@@ -8,12 +21,20 @@ use std::sync::Arc;
 
 use num::FromPrimitive;
 
+#[cfg(feature = "nightly")]
+use core::nonzero::{NonZero, Zeroable};
+
+#[cfg(feature = "nightly")]
+use std::num::Zero;
+
 use de::{
     Deserialize,
     Deserializer,
+    EnumVisitor,
     Error,
     MapVisitor,
     SeqVisitor,
+    VariantVisitor,
     Visitor,
 };
 
@@ -41,13 +62,13 @@ impl Deserialize for () {
     fn deserialize<D>(deserializer: &mut D) -> Result<(), D::Error>
         where D: Deserializer,
     {
-        deserializer.visit(UnitVisitor)
+        deserializer.visit_unit(UnitVisitor)
     }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
-struct BoolVisitor;
+pub struct BoolVisitor;
 
 impl Visitor for BoolVisitor {
     type Value = bool;
@@ -73,7 +94,7 @@ impl Deserialize for bool {
     fn deserialize<D>(deserializer: &mut D) -> Result<bool, D::Error>
         where D: Deserializer,
     {
-        deserializer.visit(BoolVisitor)
+        deserializer.visit_bool(BoolVisitor)
     }
 }
 
@@ -133,30 +154,30 @@ impl<
 }
 
 macro_rules! impl_deserialize_num {
-    ($ty:ty) => {
+    ($ty:ty, $method:ident) => {
         impl Deserialize for $ty {
             #[inline]
             fn deserialize<D>(deserializer: &mut D) -> Result<$ty, D::Error>
                 where D: Deserializer,
             {
-                deserializer.visit(PrimitiveVisitor::new())
+                deserializer.$method(PrimitiveVisitor::new())
             }
         }
     }
 }
 
-impl_deserialize_num!(isize);
+impl_deserialize_num!(isize, visit_isize);
-impl_deserialize_num!(i8);
+impl_deserialize_num!(i8, visit_i8);
-impl_deserialize_num!(i16);
+impl_deserialize_num!(i16, visit_i16);
-impl_deserialize_num!(i32);
+impl_deserialize_num!(i32, visit_i32);
-impl_deserialize_num!(i64);
+impl_deserialize_num!(i64, visit_i64);
-impl_deserialize_num!(usize);
+impl_deserialize_num!(usize, visit_usize);
-impl_deserialize_num!(u8);
+impl_deserialize_num!(u8, visit_u8);
-impl_deserialize_num!(u16);
+impl_deserialize_num!(u16, visit_u16);
-impl_deserialize_num!(u32);
+impl_deserialize_num!(u32, visit_u32);
-impl_deserialize_num!(u64);
+impl_deserialize_num!(u64, visit_u64);
-impl_deserialize_num!(f32);
+impl_deserialize_num!(f32, visit_f32);
-impl_deserialize_num!(f64);
+impl_deserialize_num!(f64, visit_f64);
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -194,7 +215,7 @@ impl Deserialize for char {
     fn deserialize<D>(deserializer: &mut D) -> Result<char, D::Error>
         where D: Deserializer,
     {
-        deserializer.visit(CharVisitor)
+        deserializer.visit_char(CharVisitor)
     }
 }
 
@@ -240,7 +261,7 @@ impl Deserialize for String {
     fn deserialize<D>(deserializer: &mut D) -> Result<String, D::Error>
         where D: Deserializer,
     {
-        deserializer.visit(StringVisitor)
+        deserializer.visit_string(StringVisitor)
     }
 }
 
@@ -280,159 +301,131 @@ impl<T> Deserialize for Option<T> where T: Deserialize {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-pub struct BTreeSetVisitor<T> {
+macro_rules! set_impl {
-    marker: PhantomData<T>,
+    (
-}
+        $ty:ty,
+        < $($constraints:ident),* >,
+        $visitor_name:ident,
+        $visitor:ident,
+        $ctor:expr,
+        $with_capacity:expr,
+        $insert:expr
+    ) => {
+        pub struct $visitor_name<T> {
+            marker: PhantomData<T>,
+        }
 
-impl<T> BTreeSetVisitor<T> {
+        impl<T> $visitor_name<T> {
-    pub fn new() -> Self {
+            pub fn new() -> Self {
-        BTreeSetVisitor {
+                $visitor_name {
-            marker: PhantomData,
+                    marker: PhantomData,
+                }
+            }
+        }
+
+        impl<T> Visitor for $visitor_name<T>
+            where T: $($constraints +)*,
+        {
+            type Value = $ty;
+
+            #[inline]
+            fn visit_unit<E>(&mut self) -> Result<$ty, E>
+                where E: Error,
+            {
+                Ok($ctor)
+            }
+
+            #[inline]
+            fn visit_seq<V>(&mut self, mut $visitor: V) -> Result<$ty, V::Error>
+                where V: SeqVisitor,
+            {
+                let mut values = $with_capacity;
+
+                while let Some(value) = try!($visitor.visit()) {
+                    $insert(&mut values, value);
+                }
+
+                try!($visitor.end());
+
+                Ok(values)
+            }
+        }
+
+        impl<T> Deserialize for $ty
+            where T: $($constraints +)*,
+        {
+            fn deserialize<D>(deserializer: &mut D) -> Result<$ty, D::Error>
+                where D: Deserializer,
+            {
+                deserializer.visit_seq($visitor_name::new())
+            }
         }
     }
 }
 
-impl<T> Visitor for BTreeSetVisitor<T>
+set_impl!(
-    where T: Deserialize + Eq + Ord,
+    BinaryHeap<T>,
-{
+    <Deserialize, Ord>,
-    type Value = BTreeSet<T>;
+    BinaryHeapVisitor,
+    visitor,
+    BinaryHeap::new(),
+    BinaryHeap::with_capacity(visitor.size_hint().0),
+    BinaryHeap::push);
 
-    #[inline]
+set_impl!(
-    fn visit_unit<E>(&mut self) -> Result<BTreeSet<T>, E>
+    BTreeSet<T>,
-        where E: Error,
+    <Deserialize, Eq, Ord>,
-    {
+    BTreeSetVisitor,
-        Ok(BTreeSet::new())
+    visitor,
-    }
+    BTreeSet::new(),
+    BTreeSet::new(),
+    BTreeSet::insert);
 
-    #[inline]
+#[cfg(feature = "nightly")]
-    fn visit_seq<V>(&mut self, mut visitor: V) -> Result<BTreeSet<T>, V::Error>
+set_impl!(
-        where V: SeqVisitor,
+    EnumSet<T>,
-    {
+    <Deserialize, CLike>,
-        let mut values = BTreeSet::new();
+    EnumSetVisitor,
+    visitor,
+    EnumSet::new(),
+    EnumSet::new(),
+    EnumSet::insert);
 
-        while let Some(value) = try!(visitor.visit()) {
+set_impl!(
-            values.insert(value);
+    LinkedList<T>,
-        }
+    <Deserialize>,
+    LinkedListVisitor,
+    visitor,
+    LinkedList::new(),
+    LinkedList::new(),
+    LinkedList::push_back);
 
-        try!(visitor.end());
+set_impl!(
+    HashSet<T>,
+    <Deserialize, Eq, Hash>,
+    HashSetVisitor,
+    visitor,
+    HashSet::new(),
+    HashSet::with_capacity(visitor.size_hint().0),
+    HashSet::insert);
 
-        Ok(values)
+set_impl!(
-    }
+    Vec<T>,
-}
+    <Deserialize>,
+    VecVisitor,
+    visitor,
+    Vec::new(),
+    Vec::with_capacity(visitor.size_hint().0),
+    Vec::push);
 
-impl<T> Deserialize for BTreeSet<T>
+set_impl!(
-    where T: Deserialize + Eq + Ord,
+    VecDeque<T>,
-{
+    <Deserialize>,
-    fn deserialize<D>(deserializer: &mut D) -> Result<BTreeSet<T>, D::Error>
+    VecDequeVisitor,
-        where D: Deserializer,
+    visitor,
-    {
+    VecDeque::new(),
-        deserializer.visit(BTreeSetVisitor::new())
+    VecDeque::with_capacity(visitor.size_hint().0),
-    }
+    VecDeque::push_back);
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-pub struct HashSetVisitor<T> {
-    marker: PhantomData<T>,
-}
-
-impl<T> HashSetVisitor<T> {
-    pub fn new() -> Self {
-        HashSetVisitor {
-            marker: PhantomData,
-        }
-    }
-}
-
-impl<T> Visitor for HashSetVisitor<T>
-    where T: Deserialize + Eq + Hash,
-{
-    type Value = HashSet<T>;
-
-    #[inline]
-    fn visit_unit<E>(&mut self) -> Result<HashSet<T>, E>
-        where E: Error,
-    {
-        Ok(HashSet::new())
-    }
-
-    #[inline]
-    fn visit_seq<V>(&mut self, mut visitor: V) -> Result<HashSet<T>, V::Error>
-        where V: SeqVisitor,
-    {
-        let (len, _) = visitor.size_hint();
-        let mut values = HashSet::with_capacity(len);
-
-        while let Some(value) = try!(visitor.visit()) {
-            values.insert(value);
-        }
-
-        try!(visitor.end());
-
-        Ok(values)
-    }
-}
-
-impl<T> Deserialize for HashSet<T>
-    where T: Deserialize + Eq + Hash,
-{
-    fn deserialize<D>(deserializer: &mut D) -> Result<HashSet<T>, D::Error>
-        where D: Deserializer,
-    {
-        deserializer.visit(HashSetVisitor::new())
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-pub struct VecVisitor<T> {
-    marker: PhantomData<T>,
-}
-
-impl<T> VecVisitor<T> {
-    pub fn new() -> Self {
-        VecVisitor {
-            marker: PhantomData,
-        }
-    }
-}
-
-impl<T> Visitor for VecVisitor<T> where T: Deserialize {
-    type Value = Vec<T>;
-
-    #[inline]
-    fn visit_unit<E>(&mut self) -> Result<Vec<T>, E>
-        where E: Error,
-    {
-        Ok(Vec::new())
-    }
-
-    #[inline]
-    fn visit_seq<V>(&mut self, mut visitor: V) -> Result<Vec<T>, V::Error>
-        where V: SeqVisitor,
-    {
-        let (len, _) = visitor.size_hint();
-        let mut values = Vec::with_capacity(len);
-
-        while let Some(value) = try!(visitor.visit()) {
-            values.push(value);
-        }
-
-        try!(visitor.end());
-
-        Ok(values)
-    }
-}
-
-impl<T> Deserialize for Vec<T>
-    where T: Deserialize,
-{
-    fn deserialize<D>(deserializer: &mut D) -> Result<Vec<T>, D::Error>
-        where D: Deserializer,
-    {
-        deserializer.visit_seq(VecVisitor::new())
-    }
-}
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -473,7 +466,7 @@ impl<T> Deserialize for [T; 0]
     fn deserialize<D>(deserializer: &mut D) -> Result<[T; 0], D::Error>
         where D: Deserializer,
     {
-        deserializer.visit(ArrayVisitor0::new())
+        deserializer.visit_seq(ArrayVisitor0::new())
     }
 }
 
@@ -518,7 +511,7 @@ macro_rules! array_impls {
                 fn deserialize<D>(deserializer: &mut D) -> Result<[T; $len], D::Error>
                     where D: Deserializer,
                 {
-                    deserializer.visit($visitor::new())
+                    deserializer.visit_seq($visitor::new())
                 }
             }
         )+
@@ -608,7 +601,7 @@ macro_rules! tuple_impls {
                 fn deserialize<D>(deserializer: &mut D) -> Result<($($name,)+), D::Error>
                     where D: Deserializer,
                 {
-                    deserializer.visit_seq($visitor { marker: PhantomData })
+                    deserializer.visit_tuple($visitor { marker: PhantomData })
                 }
             }
         )+
@@ -632,123 +625,96 @@ tuple_impls! {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-pub struct BTreeMapVisitor<K, V> {
+macro_rules! map_impl {
-    marker: PhantomData<BTreeMap<K, V>>,
+    (
-}
+        $ty:ty,
+        < $($constraints:ident),* >,
+        $visitor_name:ident,
+        $visitor:ident,
+        $ctor:expr,
+        $with_capacity:expr,
+        $insert:expr
+    ) => {
+        pub struct $visitor_name<K, V> {
+            marker: PhantomData<$ty>,
+        }
 
-impl<K, V> BTreeMapVisitor<K, V> {
+        impl<K, V> $visitor_name<K, V> {
-    #[inline]
+            pub fn new() -> Self {
-    pub fn new() -> Self {
+                $visitor_name {
-        BTreeMapVisitor {
+                    marker: PhantomData,
-            marker: PhantomData,
+                }
+            }
+        }
+
+        impl<K, V> Visitor for $visitor_name<K, V>
+            where K: $($constraints +)*,
+                  V: Deserialize,
+        {
+            type Value = $ty;
+
+            #[inline]
+            fn visit_unit<E>(&mut self) -> Result<$ty, E>
+                where E: Error,
+            {
+                Ok($ctor)
+            }
+
+            #[inline]
+            fn visit_map<Visitor>(&mut self, mut $visitor: Visitor) -> Result<$ty, Visitor::Error>
+                where Visitor: MapVisitor,
+            {
+                let mut values = $with_capacity;
+
+                while let Some((key, value)) = try!($visitor.visit()) {
+                    $insert(&mut values, key, value);
+                }
+
+                try!($visitor.end());
+
+                Ok(values)
+            }
+        }
+
+        impl<K, V> Deserialize for $ty
+            where K: $($constraints +)*,
+                  V: Deserialize,
+        {
+            fn deserialize<D>(deserializer: &mut D) -> Result<$ty, D::Error>
+                where D: Deserializer,
+            {
+                deserializer.visit_map($visitor_name::new())
+            }
         }
     }
 }
 
-impl<K, V> Visitor for BTreeMapVisitor<K, V>
+map_impl!(
-    where K: Deserialize + Ord,
+    BTreeMap<K, V>,
-          V: Deserialize
+    <Deserialize, Eq, Ord>,
-{
+    BTreeMapVisitor,
-    type Value = BTreeMap<K, V>;
+    visitor,
+    BTreeMap::new(),
+    BTreeMap::new(),
+    BTreeMap::insert);
 
-    #[inline]
+map_impl!(
-    fn visit_unit<E>(&mut self) -> Result<BTreeMap<K, V>, E>
+    HashMap<K, V>,
-        where E: Error,
+    <Deserialize, Eq, Hash>,
-    {
+    HashMapVisitor,
-        Ok(BTreeMap::new())
+    visitor,
-    }
+    HashMap::new(),
-
+    HashMap::with_capacity(visitor.size_hint().0),
-    #[inline]
+    HashMap::insert);
-    fn visit_map<Visitor>(&mut self, mut visitor: Visitor) -> Result<BTreeMap<K, V>, Visitor::Error>
-        where Visitor: MapVisitor,
-    {
-        let mut values = BTreeMap::new();
-
-        while let Some((key, value)) = try!(visitor.visit()) {
-            values.insert(key, value);
-        }
-
-        try!(visitor.end());
-
-        Ok(values)
-    }
-}
-
-impl<K, V> Deserialize for BTreeMap<K, V>
-    where K: Deserialize + Eq + Ord,
-          V: Deserialize,
-{
-    fn deserialize<D>(deserializer: &mut D) -> Result<BTreeMap<K, V>, D::Error>
-        where D: Deserializer,
-    {
-        deserializer.visit(BTreeMapVisitor::new())
-    }
-}
 
 ///////////////////////////////////////////////////////////////////////////////
 
-pub struct HashMapVisitor<K, V> {
+#[cfg(feature = "nightly")]
-    marker: PhantomData<HashMap<K, V>>,
-}
-
-impl<K, V> HashMapVisitor<K, V> {
-    #[inline]
-    pub fn new() -> Self {
-        HashMapVisitor {
-            marker: PhantomData,
-        }
-    }
-}
-
-impl<K, V> Visitor for HashMapVisitor<K, V>
-    where K: Deserialize + Eq + Hash,
-          V: Deserialize,
-{
-    type Value = HashMap<K, V>;
-
-    #[inline]
-    fn visit_unit<E>(&mut self) -> Result<HashMap<K, V>, E>
-        where E: Error,
-    {
-        Ok(HashMap::new())
-    }
-
-    #[inline]
-    fn visit_map<V_>(&mut self, mut visitor: V_) -> Result<HashMap<K, V>, V_::Error>
-        where V_: MapVisitor,
-    {
-        let (len, _) = visitor.size_hint();
-        let mut values = HashMap::with_capacity(len);
-
-        while let Some((key, value)) = try!(visitor.visit()) {
-            values.insert(key, value);
-        }
-
-        try!(visitor.end());
-
-        Ok(values)
-    }
-}
-
-impl<K, V> Deserialize for HashMap<K, V>
-    where K: Deserialize + Eq + Hash,
-          V: Deserialize,
-{
-    fn deserialize<D>(deserializer: &mut D) -> Result<HashMap<K, V>, D::Error>
-        where D: Deserializer,
-    {
-        deserializer.visit(HashMapVisitor::new())
-    }
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
-// FIXME: `VecMap` is unstable.
-/*
 pub struct VecMapVisitor<V> {
     marker: PhantomData<VecMap<V>>,
 }
 
+#[cfg(feature = "nightly")]
 impl<V> VecMapVisitor<V> {
     #[inline]
     pub fn new() -> Self {
@@ -758,6 +724,7 @@ impl<V> VecMapVisitor<V> {
     }
 }
 
+#[cfg(feature = "nightly")]
 impl<V> Visitor for VecMapVisitor<V>
     where V: Deserialize,
 {
@@ -787,16 +754,16 @@ impl<V> Visitor for VecMapVisitor<V>
     }
 }
 
+#[cfg(feature = "nightly")]
 impl<V> Deserialize for VecMap<V>
     where V: Deserialize,
 {
     fn deserialize<D>(deserializer: &mut D) -> Result<VecMap<V>, D::Error>
         where D: Deserializer,
     {
-        deserializer.visit(VecMapVisitor::new())
+        deserializer.visit_map(VecMapVisitor::new())
     }
 }
-*/
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -854,3 +821,154 @@ impl<T: Deserialize> Deserialize for Rc<T> {
         Ok(Rc::new(val))
     }
 }
+
+impl<'a, T: ?Sized> Deserialize for Cow<'a, T> where T: ToOwned, T::Owned: Deserialize, {
+    #[inline]
+    fn deserialize<D>(deserializer: &mut D) -> Result<Cow<'a, T>, D::Error>
+        where D: Deserializer,
+    {
+        let val = try!(Deserialize::deserialize(deserializer));
+        Ok(Cow::Owned(val))
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#[cfg(feature = "nightly")]
+impl<T> Deserialize for NonZero<T> where T: Deserialize + PartialEq + Zeroable + Zero {
+    fn deserialize<D>(deserializer: &mut D) -> Result<NonZero<T>, D::Error> where D: Deserializer {
+        let value = try!(Deserialize::deserialize(deserializer));
+        if value == Zero::zero() {
+            return Err(Error::syntax_error())
+        }
+        unsafe {
+            Ok(NonZero::new(value))
+        }
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+impl<T, E> Deserialize for Result<T, E> where T: Deserialize, E: Deserialize {
+    fn deserialize<D>(deserializer: &mut D) -> Result<Result<T, E>, D::Error>
+                      where D: Deserializer {
+        enum Field {
+            Field0,
+            Field1,
+        }
+
+        impl Deserialize for Field {
+            #[inline]
+            fn deserialize<D>(deserializer: &mut D) -> Result<Field, D::Error>
+                              where D: Deserializer {
+                struct FieldVisitor<D> {
+                    phantom: PhantomData<D>,
+                }
+
+                impl<D> ::de::Visitor for FieldVisitor<D> where D: Deserializer {
+                    type Value = Field;
+
+                    fn visit_str<E>(&mut self, value: &str) -> Result<Field, E> where E: Error {
+                        match value {
+                            "Ok" => Ok(Field::Field0),
+                            "Err" => Ok(Field::Field1),
+                            _ => Err(Error::unknown_field_error(value)),
+                        }
+                    }
+
+                    fn visit_bytes<E>(&mut self, value: &[u8]) -> Result<Field, E> where E: Error {
+                        match str::from_utf8(value) {
+                            Ok(s) => self.visit_str(s),
+                            _ => Err(Error::syntax_error()),
+                        }
+                    }
+                }
+
+                deserializer.visit(FieldVisitor::<D> {
+                    phantom: PhantomData,
+                })
+            }
+        }
+
+        struct Visitor<D, T, E>(PhantomData<D>, PhantomData<T>, PhantomData<E>)
+                                where D: Deserializer, T: Deserialize, E: Deserialize;
+
+        impl<D, T, E> EnumVisitor for Visitor<D, T, E> where D: Deserializer,
+                                                             T: Deserialize,
+                                                             E: Deserialize {
+            type Value = Result<T, E>;
+
+            fn visit<V>(&mut self, mut visitor: V) -> Result<Result<T, E>, V::Error>
+                        where V: VariantVisitor {
+                match match visitor.visit_variant() {
+                          Ok(val) => val,
+                          Err(err) => return Err(From::from(err)),
+                      } {
+                    Field::Field0 => {
+                        struct Visitor<D, T, E>(PhantomData<D>, PhantomData<T>, PhantomData<E>)
+                                                where D: Deserializer,
+                                                      T: Deserialize,
+                                                      E: Deserialize;
+                        impl <D, T, E> ::de::Visitor for Visitor<D, T, E> where D: Deserializer,
+                                                                                T: Deserialize,
+                                                                                E: Deserialize {
+                            type Value = Result<T, E>;
+
+                            fn visit_seq<V>(&mut self, mut visitor: V)
+                                            -> Result<Result<T, E>, V::Error> where V: SeqVisitor {
+                                let field0 = match match visitor.visit() {
+                                          Ok(val) => val,
+                                          Err(err) => return Err(From::from(err)),
+                                      } {
+                                    Some(value) => value,
+                                    None => return Err(Error::end_of_stream_error()),
+                                };
+                                match visitor.end() {
+                                    Ok(val) => val,
+                                    Err(err) => return Err(From::from(err)),
+                                };
+                                Ok(Result::Ok(field0))
+                            }
+                        }
+                        visitor.visit_seq(Visitor::<D, T, E>(PhantomData,
+                                                             PhantomData,
+                                                             PhantomData))
+                    }
+                    Field::Field1 => {
+                        struct Visitor<D, T, E>(PhantomData<D>, PhantomData<T>, PhantomData<E>)
+                                                where D: Deserializer,
+                                                      T: Deserialize,
+                                                      E: Deserialize;
+                        impl <D, T, E> ::de::Visitor for Visitor<D, T, E> where D: Deserializer,
+                                                                                T: Deserialize,
+                                                                                E: Deserialize {
+                            type Value = Result<T, E>;
+
+                            fn visit_seq<V>(&mut self, mut visitor: V)
+                                            -> Result<Result<T, E>, V::Error> where V: SeqVisitor {
+                                let field0 = match match visitor.visit() {
+                                          Ok(val) => val,
+                                          Err(err) => return Err(From::from(err)),
+                                      } {
+                                    Some(value) => value,
+                                    None => return Err(Error::end_of_stream_error()),
+                                };
+                                match visitor.end() {
+                                    Ok(val) => val,
+                                    Err(err) => return Err(From::from(err)),
+                                };
+                                Ok(Result::Err(field0))
+                            }
+                        }
+                        visitor.visit_seq(Visitor::<D, T, E>(PhantomData,
+                                                             PhantomData,
+                                                             PhantomData))
+                    }
+                }
+            }
+        }
+
+        deserializer.visit_enum("Result",
+                                Visitor::<D, T, E>(PhantomData, PhantomData, PhantomData))
+    }
+}

serde/src/de/mod.rs

@@ -25,18 +25,164 @@ pub trait Deserialize {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-/// `Deserializer` is an abstract trait that can deserialize values into a `Visitor`.
+/// `Deserializer` is a trait that can deserialize values by threading a `Visitor` trait through a
+/// value. It supports two entry point styles which enables different kinds of deserialization.
+///
+/// 1) The `visit` method. File formats like JSON embed the type of it's construct in it's file
+///    format. This allows the `Deserializer` to deserialize into a generic type like
+///    `json::Value`, which can represent all JSON types.
+///
+/// 2) The `visit_*` methods. File formats like bincode do not embed in it's format how to decode
+///    it's values. It relies instead on the `Deserialize` type to hint to the `Deserializer` with
+///    the `visit_*` methods how it should parse the next value. One downside though to only
+///    supporting the `visit_*` types is that it does not allow for deserializing into a generic
+///    `json::Value`-esque type.
 pub trait Deserializer {
     type Error: Error;
 
-    /// The `visit` method walks a visitor through a value as it is being deserialized.
+    /// This method walks a visitor through a value as it is being deserialized.
     fn visit<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor;
 
-    /// The `visit_option` method allows a `Deserialize` type to inform the `Deserializer` that
+    /// This method hints that the `Deserialize` type is expecting a `bool` value.
-    /// it's expecting an optional value. This allows deserializers that encode an optional value
+    #[inline]
-    /// as a nullable value to convert the null value into a `None`, and a regular value as
+    fn visit_bool<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
-    /// `Some(value)`.
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `usize` value.
+    #[inline]
+    fn visit_usize<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `u8` value.
+    #[inline]
+    fn visit_u8<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `u16` value.
+    #[inline]
+    fn visit_u16<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `u32` value.
+    #[inline]
+    fn visit_u32<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `u64` value.
+    #[inline]
+    fn visit_u64<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `isize` value.
+    #[inline]
+    fn visit_isize<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `i8` value.
+    #[inline]
+    fn visit_i8<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `i16` value.
+    #[inline]
+    fn visit_i16<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `i32` value.
+    #[inline]
+    fn visit_i32<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `i64` value.
+    #[inline]
+    fn visit_i64<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting a `f32` value.
+    #[inline]
+    fn visit_f32<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting a `f64` value.
+    #[inline]
+    fn visit_f64<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting a `char` value.
+    #[inline]
+    fn visit_char<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting a `&str` value.
+    #[inline]
+    fn visit_str<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting a `String` value.
+    #[inline]
+    fn visit_string<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit_str(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `unit` value.
+    #[inline]
+    fn visit_unit<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an `Option` value. This allows
+    /// deserializers that encode an optional value as a nullable value to convert the null value
+    /// into a `None`, and a regular value as `Some(value)`.
     #[inline]
     fn visit_option<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor,
@@ -44,9 +190,8 @@ pub trait Deserializer {
         self.visit(visitor)
     }
 
-    /// The `visit_seq` method allows a `Deserialize` type to inform the `Deserializer` that it's
+    /// This method hints that the `Deserialize` type is expecting a sequence value. This allows
-    /// expecting a sequence of values. This allows deserializers to parse sequences that aren't
+    /// deserializers to parse sequences that aren't tagged as sequences.
-    /// tagged as sequences.
     #[inline]
     fn visit_seq<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor,
@@ -54,9 +199,8 @@ pub trait Deserializer {
         self.visit(visitor)
     }
 
-    /// The `visit_map` method allows a `Deserialize` type to inform the `Deserializer` that it's
+    /// This method hints that the `Deserialize` type is expecting a map of values. This allows
-    /// expecting a map of values. This allows deserializers to parse sequences that aren't tagged
+    /// deserializers to parse sequences that aren't tagged as maps.
-    /// as maps.
     #[inline]
     fn visit_map<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor,
@@ -64,9 +208,8 @@ pub trait Deserializer {
         self.visit(visitor)
     }
 
-    /// The `visit_named_unit` method allows a `Deserialize` type to inform the `Deserializer` that
+    /// This method hints that the `Deserialize` type is expecting a named unit. This allows
-    /// it's expecting a named unit. This allows deserializers to a named unit that aren't tagged
+    /// deserializers to a named unit that aren't tagged as a named unit.
-    /// as a named unit.
     #[inline]
     fn visit_named_unit<V>(&mut self, _name: &str, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor,
@@ -74,9 +217,8 @@ pub trait Deserializer {
         self.visit(visitor)
     }
 
-    /// The `visit_named_seq` method allows a `Deserialize` type to inform the `Deserializer` that
+    /// This method hints that the `Deserialize` type is expecting a named sequence.
-    /// it's expecting a named sequence of values. This allows deserializers to parse sequences
+    /// This allows deserializers to parse sequences that aren't tagged as sequences.
-    /// that aren't tagged as sequences.
     #[inline]
     fn visit_named_seq<V>(&mut self, _name: &str, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor,
@@ -84,9 +226,8 @@ pub trait Deserializer {
         self.visit_seq(visitor)
     }
 
-    /// The `visit_named_map` method allows a `Deserialize` type to inform the `Deserializer` that
+    /// This method hints that the `Deserialize` type is expecting a named map.  This allows
-    /// it's expecting a map of values. This allows deserializers to parse sequences that aren't
+    /// deserializers to parse sequences that aren't tagged as maps.
-    /// tagged as maps.
     #[inline]
     fn visit_named_map<V>(&mut self, _name: &str, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor,
@@ -94,9 +235,18 @@ pub trait Deserializer {
         self.visit_map(visitor)
     }
 
-    /// The `visit_enum` method allows a `Deserialize` type to inform the `Deserializer` that it's
+    /// This method hints that the `Deserialize` type is expecting a tuple value. This allows
-    /// expecting an enum value. This allows deserializers that provide a custom enumeration
+    /// deserializers that provide a custom tuple serialization to properly deserialize the type.
-    /// serialization to properly deserialize the type.
+    #[inline]
+    fn visit_tuple<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
+        where V: Visitor,
+    {
+        self.visit(visitor)
+    }
+
+    /// This method hints that the `Deserialize` type is expecting an enum value. This allows
+    /// deserializers that provide a custom enumeration serialization to properly deserialize the
+    /// type.
     #[inline]
     fn visit_enum<V>(&mut self, _enum: &str, _visitor: V) -> Result<V::Value, Self::Error>
         where V: EnumVisitor,
@@ -104,9 +254,9 @@ pub trait Deserializer {
         Err(Error::syntax_error())
     }
 
-    /// The `visit_bytes` method allows a `Deserialize` type to inform the `Deserializer` that it's
+    /// This method hints that the `Deserialize` type is expecting a `Vec<u8>`. This allows
-    /// expecting a `Vec<u8>`. This allows deserializers that provide a custom byte vector
+    /// deserializers that provide a custom byte vector serialization to properly deserialize the
-    /// serialization to properly deserialize the type.
+    /// type.
     #[inline]
     fn visit_bytes<V>(&mut self, visitor: V) -> Result<V::Value, Self::Error>
         where V: Visitor,

serde/src/lib.rs

@@ -6,9 +6,16 @@
 //! leaving serde to perform roughly the same speed as a hand written serializer for a specific
 //! type.
 #![doc(html_root_url="http://erickt.github.io/rust-serde")]
+#![cfg_attr(feature = "nightly", feature(collections, core, enumset, nonzero, step_trait, vecmap, zero_one))]
 
 extern crate num;
 
+#[cfg(feature = "nightly")]
+extern crate collections;
+
+#[cfg(feature = "nightly")]
+extern crate core;
+
 pub use ser::{Serialize, Serializer};
 pub use de::{Deserialize, Deserializer, Error};
 

serde/src/ser/impls.rs

@@ -1,9 +1,32 @@
-use std::collections::{BTreeMap, BTreeSet, HashMap, HashSet};
+use std::borrow::Cow;
+use std::collections::{
+    BinaryHeap,
+    BTreeMap,
+    BTreeSet,
+    LinkedList,
+    HashMap,
+    HashSet,
+    VecDeque,
+};
+#[cfg(feature = "nightly")]
+use collections::enum_set::{CLike, EnumSet};
+#[cfg(feature = "nightly")]
+use std::collections::vec_map::VecMap;
 use std::hash::Hash;
+#[cfg(feature = "nightly")]
+use std::iter;
+use std::marker::PhantomData;
+#[cfg(feature = "nightly")]
+use std::num;
+#[cfg(feature = "nightly")]
+use std::ops;
 use std::path;
 use std::rc::Rc;
 use std::sync::Arc;
 
+#[cfg(feature = "nightly")]
+use core::nonzero::{NonZero, Zeroable};
+
 use super::{
     Serialize,
     Serializer,
@@ -119,7 +142,7 @@ impl<T, Iter> SeqVisitor for SeqIteratorVisitor<Iter>
 
 ///////////////////////////////////////////////////////////////////////////////
 
-impl<'a, T> Serialize for &'a [T]
+impl<T> Serialize for [T]
     where T: Serialize,
 {
     #[inline]
@@ -177,12 +200,16 @@ array_impls!(30);
 array_impls!(31);
 array_impls!(32);
 
-impl<T> Serialize for Vec<T> where T: Serialize {
+///////////////////////////////////////////////////////////////////////////////
+
+impl<T> Serialize for BinaryHeap<T>
+    where T: Serialize + Ord
+{
     #[inline]
     fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
         where S: Serializer,
     {
-        (&self[..]).serialize(serializer)
+        serializer.visit_seq(SeqIteratorVisitor::new(self.iter(), Some(self.len())))
     }
 }
 
@@ -197,6 +224,18 @@ impl<T> Serialize for BTreeSet<T>
     }
 }
 
+#[cfg(feature = "nightly")]
+impl<T> Serialize for EnumSet<T>
+    where T: Serialize + CLike
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        where S: Serializer,
+    {
+        serializer.visit_seq(SeqIteratorVisitor::new(self.iter(), Some(self.len())))
+    }
+}
+
 impl<T> Serialize for HashSet<T>
     where T: Serialize + Eq + Hash,
 {
@@ -208,6 +247,49 @@ impl<T> Serialize for HashSet<T>
     }
 }
 
+impl<T> Serialize for LinkedList<T>
+    where T: Serialize,
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        where S: Serializer,
+    {
+        serializer.visit_seq(SeqIteratorVisitor::new(self.iter(), Some(self.len())))
+    }
+}
+
+#[cfg(feature = "nightly")]
+impl<A> Serialize for ops::Range<A>
+    where A: Serialize + Clone + iter::Step + num::One,
+          for<'a> &'a A: ops::Add<&'a A, Output = A>,
+{
+    #[inline]
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        where S: Serializer,
+    {
+        let len = iter::Step::steps_between(&self.start, &self.end, &A::one());
+        serializer.visit_seq(SeqIteratorVisitor::new(self.clone(), len))
+    }
+}
+
+impl<T> Serialize for Vec<T> where T: Serialize {
+    #[inline]
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        where S: Serializer,
+    {
+        (&self[..]).serialize(serializer)
+    }
+}
+
+impl<T> Serialize for VecDeque<T> where T: Serialize {
+    #[inline]
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        where S: Serializer,
+    {
+        serializer.visit_seq(SeqIteratorVisitor::new(self.iter(), Some(self.len())))
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 impl Serialize for () {
@@ -257,7 +339,7 @@ macro_rules! tuple_impls {
                         $(
                             $state => {
                                 self.state += 1;
-                                Ok(Some(try!(serializer.visit_seq_elt(&e!(self.tuple.$idx)))))
+                                Ok(Some(try!(serializer.visit_tuple_elt(&e!(self.tuple.$idx)))))
                             }
                         )+
                         _ => {
@@ -276,7 +358,7 @@ macro_rules! tuple_impls {
             {
                 #[inline]
                 fn serialize<S: Serializer>(&self, serializer: &mut S) -> Result<(), S::Error> {
-                    serializer.visit_seq($TupleVisitor::new(self))
+                    serializer.visit_tuple($TupleVisitor::new(self))
                 }
             }
         )+
@@ -457,8 +539,7 @@ impl<K, V> Serialize for HashMap<K, V>
     }
 }
 
-// FIXME: `VecMap` is unstable.
+#[cfg(feature = "nightly")]
-/*
 impl<V> Serialize for VecMap<V>
     where V: Serialize,
 {
@@ -469,7 +550,6 @@ impl<V> Serialize for VecMap<V>
         serializer.visit_map(MapIteratorVisitor::new(self.iter(), Some(self.len())))
     }
 }
-*/
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -518,6 +598,104 @@ impl<T> Serialize for Arc<T> where T: Serialize, {
     }
 }
 
+impl<'a, T: ?Sized> Serialize for Cow<'a, T> where T: Serialize + ToOwned, {
+    #[inline]
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error>
+        where S: Serializer,
+    {
+        (**self).serialize(serializer)
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+impl<T, E> Serialize for Result<T, E> where T: Serialize, E: Serialize {
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer {
+        match *self {
+            Result::Ok(ref field0) => {
+                struct Visitor<'a, T, E> where T: Serialize + 'a, E: Serialize + 'a {
+                    state: usize,
+                    value: (&'a T,),
+                    _structure_ty: PhantomData<&'a Result<T, E>>,
+                }
+
+                impl<'a, T, E> SeqVisitor for Visitor<'a, T, E> where T: Serialize + 'a,
+                                                                      E: Serialize + 'a {
+                    #[inline]
+                    fn visit<S>(&mut self, serializer: &mut S) -> Result<Option<()>, S::Error>
+                                where S: Serializer {
+                        match self.state {
+                            0 => {
+                                self.state += 1;
+                                let v = match serializer.visit_seq_elt(&self.value.0) {
+                                    Ok(val) => val,
+                                    Err(err) => return Err(From::from(err)),
+                                };
+                                Ok(Some(v))
+                            }
+                            _ => Ok(None),
+                        }
+                    }
+
+                    #[inline]
+                    fn len(&self) -> Option<usize> {
+                        Some(1)
+                    }
+                }
+
+                let field0: &T = field0;
+                let data: PhantomData<&Result<&T,E>> = PhantomData;
+                let visitor = Visitor {
+                    value: (&field0,),
+                    state: 0,
+                    _structure_ty: data
+                };
+                serializer.visit_enum_seq("Result", "Ok", visitor)
+            }
+            Result::Err(ref field0) => {
+                struct Visitor<'a, T, E> where T: Serialize + 'a, E: Serialize + 'a {
+                    state: usize,
+                    value: (&'a E,),
+                    _structure_ty: PhantomData<&'a Result<T, E>>,
+                }
+
+                impl<'a, T, E> SeqVisitor for Visitor<'a, T, E> where T: Serialize + 'a,
+                                                                      E: Serialize + 'a {
+                    #[inline]
+                    fn visit<S>(&mut self, serializer: &mut S) -> Result<Option<()>, S::Error>
+                                where S: Serializer {
+                        match self.state {
+                            0 => {
+                                self.state += 1;
+                                let v = match serializer.visit_seq_elt(&self.value.0) {
+                                    Ok(val) => val,
+                                    Err(err) => return Err(From::from(err)),
+                                };
+                                Ok(Some(v))
+                            }
+                            _ => Ok(None),
+                        }
+                    }
+
+                    #[inline]
+                    fn len(&self) -> Option<usize> {
+                        Some(1)
+                    }
+                }
+
+                let field0: &E = field0;
+                let data: PhantomData<&Result<T,&E>> = PhantomData;
+                let visitor = Visitor {
+                    value: (&field0,),
+                    state: 0,
+                    _structure_ty: data
+                };
+                serializer.visit_enum_seq("Result", "Err", visitor)
+            }
+        }
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 
 impl Serialize for path::Path {
@@ -535,3 +713,10 @@ impl Serialize for path::PathBuf {
         self.to_str().unwrap().serialize(serializer)
     }
 }
+
+#[cfg(feature = "nightly")]
+impl<T> Serialize for NonZero<T> where T: Serialize + Zeroable {
+    fn serialize<S>(&self, serializer: &mut S) -> Result<(), S::Error> where S: Serializer {
+        (**self).serialize(serializer)
+    }
+}

serde/src/ser/mod.rs

@@ -132,13 +132,37 @@ pub trait Serializer {
     fn visit_seq<V>(&mut self, visitor: V) -> Result<(), Self::Error>
         where V: SeqVisitor;
 
+    fn visit_seq_elt<T>(&mut self, value: T) -> Result<(), Self::Error>
+        where T: Serialize;
+
+    #[inline]
+    fn visit_tuple<V>(&mut self, visitor: V) -> Result<(), Self::Error>
+        where V: SeqVisitor,
+    {
+        self.visit_seq(visitor)
+    }
+
+    #[inline]
+    fn visit_tuple_elt<T>(&mut self, value: T) -> Result<(), Self::Error>
+        where T: Serialize
+    {
+        self.visit_seq_elt(value)
+    }
+
     #[inline]
     fn visit_named_seq<V>(&mut self,
                           _name: &'static str,
                           visitor: V) -> Result<(), Self::Error>
         where V: SeqVisitor,
     {
-        self.visit_seq(visitor)
+        self.visit_tuple(visitor)
+    }
+
+    #[inline]
+    fn visit_named_seq_elt<T>(&mut self, value: T) -> Result<(), Self::Error>
+        where T: Serialize
+    {
+        self.visit_tuple_elt(value)
     }
 
     #[inline]
@@ -148,15 +172,23 @@ pub trait Serializer {
                          visitor: V) -> Result<(), Self::Error>
         where V: SeqVisitor,
     {
-        self.visit_seq(visitor)
+        self.visit_tuple(visitor)
     }
 
-    fn visit_seq_elt<T>(&mut self, value: T) -> Result<(), Self::Error>
+    #[inline]
-        where T: Serialize;
+    fn visit_enum_seq_elt<T>(&mut self, value: T) -> Result<(), Self::Error>
+        where T: Serialize
+    {
+        self.visit_tuple_elt(value)
+    }
 
     fn visit_map<V>(&mut self, visitor: V) -> Result<(), Self::Error>
         where V: MapVisitor;
 
+    fn visit_map_elt<K, V>(&mut self, key: K, value: V) -> Result<(), Self::Error>
+        where K: Serialize,
+              V: Serialize;
+
     #[inline]
     fn visit_named_map<V>(&mut self,
                           _name: &'static str,
@@ -167,18 +199,30 @@ pub trait Serializer {
     }
 
     #[inline]
-    fn visit_enum_map<V>(&mut self,
+    fn visit_named_map_elt<K, V>(&mut self, key: K, value: V) -> Result<(), Self::Error>
-                          _name: &'static str,
+        where K: Serialize,
-                          _variant: &'static str,
+              V: Serialize,
-                          visitor: V) -> Result<(), Self::Error>
-        where V: MapVisitor,
     {
-        self.visit_map(visitor)
+        self.visit_map_elt(key, value)
     }
 
-    fn visit_map_elt<K, V>(&mut self, key: K, value: V) -> Result<(), Self::Error>
+    #[inline]
+    fn visit_enum_map<V>(&mut self,
+                         _name: &'static str,
+                         variant: &'static str,
+                         visitor: V) -> Result<(), Self::Error>
+        where V: MapVisitor,
+    {
+        self.visit_named_map(variant, visitor)
+    }
+
+    #[inline]
+    fn visit_enum_map_elt<K, V>(&mut self, key: K, value: V) -> Result<(), Self::Error>
         where K: Serialize,
-              V: Serialize;
+              V: Serialize,
+    {
+        self.visit_named_map_elt(key, value)
+    }
 
     /// Specify a format string for the serializer.
     ///

serde_codegen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_codegen"
-version = "0.4.1"
+version = "0.4.3"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros to auto-generate implementations for the serde framework"

serde_codegen/src/de.rs

@@ -280,7 +280,7 @@ fn deserialize_tuple_struct(
             impl_generics,
             vec![deserializer_ty_param(builder)],
             vec![deserializer_ty_arg(builder)],
-                );
+        );
 
     let visit_seq_expr = deserialize_seq(
         cx,

serde_codegen/src/ser.rs

@@ -55,7 +55,10 @@ pub fn expand_derive_serialize(
         &builder,
         &item,
         &impl_generics,
-        ty.clone(),
+        builder.ty()
+            .ref_()
+            .lifetime("'__a")
+            .build_ty(ty.clone()),
     );
 
     let where_clause = &impl_generics.where_clause;
@@ -98,6 +101,7 @@ fn serialize_body(
                 builder,
                 item.ident,
                 impl_generics,
+                ty,
                 enum_def,
             )
         }
@@ -176,15 +180,11 @@ fn serialize_tuple_struct(
     ty: P<ast::Ty>,
     fields: usize,
 ) -> P<ast::Expr> {
-    let value_ty = builder.ty()
-        .ref_()
-            .lifetime("'__a")
-            .build_ty(ty);
-
     let (visitor_struct, visitor_impl) = serialize_tuple_struct_visitor(
         cx,
         builder,
-        value_ty,
+        ty.clone(),
+        ty,
         fields,
         impl_generics,
     );
@@ -197,6 +197,7 @@ fn serialize_tuple_struct(
         serializer.visit_named_seq($type_name, Visitor {
             value: self,
             state: 0,
+            _structure_ty: ::std::marker::PhantomData,
         })
     })
 }
@@ -210,15 +211,11 @@ fn serialize_struct(
     struct_def: &StructDef,
     fields: Vec<Ident>,
 ) -> P<ast::Expr> {
-    let value_ty = builder.ty()
-        .ref_()
-            .lifetime("'__a")
-            .build_ty(ty.clone());
-
     let (visitor_struct, visitor_impl) = serialize_struct_visitor(
         cx,
         builder,
-        value_ty,
+        ty.clone(),
+        ty,
         struct_def,
         impl_generics,
         fields.iter().map(|field| quote_expr!(cx, &self.value.$field)),
@@ -232,6 +229,7 @@ fn serialize_struct(
         serializer.visit_named_map($type_name, Visitor {
             value: self,
             state: 0,
+            _structure_ty: ::std::marker::PhantomData,
         })
     })
 }
@@ -241,6 +239,7 @@ fn serialize_item_enum(
     builder: &aster::AstBuilder,
     type_ident: Ident,
     impl_generics: &ast::Generics,
+    ty: P<ast::Ty>,
     enum_def: &ast::EnumDef,
 ) -> P<ast::Expr> {
     let arms: Vec<ast::Arm> = enum_def.variants.iter()
@@ -250,6 +249,7 @@ fn serialize_item_enum(
                 builder,
                 type_ident,
                 impl_generics,
+                ty.clone(),
                 variant,
             )
         })
@@ -267,6 +267,7 @@ fn serialize_variant(
     builder: &aster::AstBuilder,
     type_ident: Ident,
     generics: &ast::Generics,
+    ty: P<ast::Ty>,
     variant: &ast::Variant,
 ) -> ast::Arm {
     let type_name = builder.expr().str(type_ident);
@@ -305,6 +306,7 @@ fn serialize_variant(
                 type_name,
                 variant_name,
                 generics,
+                ty,
                 args,
                 fields,
             );
@@ -340,6 +342,7 @@ fn serialize_variant(
                 type_name,
                 variant_name,
                 generics,
+                ty,
                 struct_def,
                 fields,
             );
@@ -355,10 +358,11 @@ fn serialize_tuple_variant(
     type_name: P<ast::Expr>,
     variant_name: P<ast::Expr>,
     generics: &ast::Generics,
+    structure_ty: P<ast::Ty>,
     args: &[ast::VariantArg],
     fields: Vec<Ident>,
 ) -> P<ast::Expr> {
-    let value_ty = builder.ty().tuple()
+    let variant_ty = builder.ty().tuple()
         .with_tys(
             args.iter().map(|arg| {
                 builder.ty()
@@ -369,6 +373,15 @@ fn serialize_tuple_variant(
         )
         .build();
 
+    let (visitor_struct, visitor_impl) = serialize_tuple_struct_visitor(
+        cx,
+        builder,
+        structure_ty,
+        variant_ty,
+        args.len(),
+        generics,
+    );
+
     let value_expr = builder.expr().tuple()
         .with_exprs(
             fields.iter().map(|field| {
@@ -379,20 +392,13 @@ fn serialize_tuple_variant(
         )
         .build();
 
-    let (visitor_struct, visitor_impl) = serialize_tuple_struct_visitor(
-        cx,
-        builder,
-        value_ty,
-        args.len(),
-        generics,
-    );
-
     quote_expr!(cx, {
         $visitor_struct
         $visitor_impl
         serializer.visit_enum_seq($type_name, $variant_name, Visitor {
             value: $value_expr,
             state: 0,
+            _structure_ty: ::std::marker::PhantomData,
         })
     })
 }
@@ -403,6 +409,7 @@ fn serialize_struct_variant(
     type_name: P<ast::Expr>,
     variant_name: P<ast::Expr>,
     generics: &ast::Generics,
+    structure_ty: P<ast::Ty>,
     struct_def: &ast::StructDef,
     fields: Vec<Ident>,
 ) -> P<ast::Expr> {
@@ -430,6 +437,7 @@ fn serialize_struct_variant(
     let (visitor_struct, visitor_impl) = serialize_struct_visitor(
         cx,
         builder,
+        structure_ty,
         value_ty,
         struct_def,
         generics,
@@ -446,6 +454,7 @@ fn serialize_struct_variant(
         serializer.visit_enum_map($type_name, $variant_name, Visitor {
             value: $value_expr,
             state: 0,
+            _structure_ty: ::std::marker::PhantomData,
         })
     })
 }
@@ -453,7 +462,8 @@ fn serialize_struct_variant(
 fn serialize_tuple_struct_visitor(
     cx: &ExtCtxt,
     builder: &aster::AstBuilder,
-    value_ty: P<ast::Ty>,
+    structure_ty: P<ast::Ty>,
+    variant_ty: P<ast::Ty>,
     fields: usize,
     generics: &ast::Generics
 ) -> (P<ast::Item>, P<ast::Item>) {
@@ -466,7 +476,7 @@ fn serialize_tuple_struct_visitor(
             quote_arm!(cx,
                 $i => {
                     self.state += 1;
-                    let v = try!(serializer.visit_seq_elt(&$expr));
+                    let v = try!(serializer.visit_named_seq_elt(&$expr));
                     Ok(Some(v))
                 }
             )
@@ -484,11 +494,19 @@ fn serialize_tuple_struct_visitor(
         .strip_bounds()
         .build();
 
+    // Variants don't necessarily reference all generic lifetimes and type parameters,
+    // so to avoid a compilation failure, we'll just add a phantom type to capture these
+    // unused values.
+    let structure_ty = builder.ty()
+        .phantom_data()
+        .build(structure_ty);
+
     (
         quote_item!(cx,
             struct Visitor $visitor_impl_generics $where_clause {
                 state: usize,
-                value: $value_ty,
+                value: $variant_ty,
+                _structure_ty: $structure_ty,
             }
         ).unwrap(),
 
@@ -518,7 +536,8 @@ fn serialize_tuple_struct_visitor(
 fn serialize_struct_visitor<I>(
     cx: &ExtCtxt,
     builder: &aster::AstBuilder,
-    value_ty: P<ast::Ty>,
+    structure_ty: P<ast::Ty>,
+    variant_ty: P<ast::Ty>,
     struct_def: &StructDef,
     generics: &ast::Generics,
     value_exprs: I,
@@ -540,7 +559,7 @@ fn serialize_struct_visitor<I>(
                     Ok(
                         Some(
                             try!(
-                                serializer.visit_map_elt(
+                                serializer.visit_named_map_elt(
                                     $key_expr,
                                     $value_expr,
                                 )
@@ -563,11 +582,19 @@ fn serialize_struct_visitor<I>(
         .strip_bounds()
         .build();
 
+    // Variants don't necessarily reference all generic lifetimes and type parameters,
+    // so to avoid a compilation failure, we'll just add a phantom type to capture these
+    // unused values.
+    let structure_ty = builder.ty()
+        .phantom_data()
+        .build(structure_ty);
+
     (
         quote_item!(cx,
             struct Visitor $visitor_impl_generics $where_clause {
                 state: usize,
-                value: $value_ty,
+                value: $variant_ty,
+                _structure_ty: $structure_ty,
             }
         ).unwrap(),
 

serde_macros/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_macros"
-version = "0.4.1"
+version = "0.4.3"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "Macros to auto-generate implementations for the serde framework"
@@ -10,6 +10,9 @@ repository = "https://github.com/erickt/rust-serde"
 name = "serde_macros"
 plugin = true
 
+[features]
+default = ["serde/nightly"]
+
 [dependencies]
 serde_codegen = { version = "*", path = "../serde_codegen", default-features = false, features = ["nightly"] }
 

serde_tests/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "serde_tests"
-version = "0.4.1"
+version = "0.4.3"
 authors = ["Erick Tryzelaar <erick.tryzelaar@gmail.com>"]
 license = "MIT/Apache-2.0"
 description = "A generic serialization/deserialization framework"

serde_tests/benches/bench_log.rs

@@ -50,7 +50,7 @@ impl rustc_serialize::Decodable for HttpProtocol {
 
 impl FromStr for HttpProtocol {
     type Err = ();
-    fn from_str(s: &str) -> Result<HttpProtocol, ()> { unimplemented!() }
+    fn from_str(_s: &str) -> Result<HttpProtocol, ()> { unimplemented!() }
 }
 
 impl FromPrimitive for HttpProtocol {
@@ -104,7 +104,7 @@ enum HttpMethod {
 
 impl FromStr for HttpMethod {
     type Err = ();
-    fn from_str(s: &str) -> Result<HttpMethod, ()> { unimplemented!() }
+    fn from_str(_s: &str) -> Result<HttpMethod, ()> { unimplemented!() }
 }
 
 impl FromPrimitive for HttpMethod {
@@ -174,7 +174,7 @@ enum CacheStatus {
 
 impl FromStr for CacheStatus {
     type Err = ();
-    fn from_str(s: &str) -> Result<CacheStatus, ()> { unimplemented!() }
+    fn from_str(_s: &str) -> Result<CacheStatus, ()> { unimplemented!() }
 }
 
 impl FromPrimitive for CacheStatus {
@@ -244,7 +244,7 @@ enum OriginProtocol {
 
 impl FromStr for OriginProtocol {
     type Err = ();
-    fn from_str(s: &str) -> Result<OriginProtocol, ()> { unimplemented!() }
+    fn from_str(_s: &str) -> Result<OriginProtocol, ()> { unimplemented!() }
 }
 
 impl FromPrimitive for OriginProtocol {
@@ -307,7 +307,7 @@ enum ZonePlan {
 
 impl FromStr for ZonePlan {
     type Err = ();
-    fn from_str(s: &str) -> Result<ZonePlan, ()> { unimplemented!() }
+    fn from_str(_s: &str) -> Result<ZonePlan, ()> { unimplemented!() }
 }
 
 impl FromPrimitive for ZonePlan {
@@ -622,7 +622,7 @@ enum Country {
 
 impl FromStr for Country {
     type Err = ();
-    fn from_str(s: &str) -> Result<Country, ()> { unimplemented!() }
+    fn from_str(_s: &str) -> Result<Country, ()> { unimplemented!() }
 }
 
 impl FromPrimitive for Country {

serde_tests/tests/test_macros.rs

@@ -123,6 +123,14 @@ enum DeEnum<B, C: /* Trait */, D> /* where D: Trait */ {
     },
 }
 
+#[derive(Serialize)]
+enum Lifetimes<'a> {
+    LifetimeSeq(&'a i32),
+    NoLifetimeSeq(i32),
+    LifetimeMap { a: &'a i32 },
+    NoLifetimeMap { a: i32 },
+}
+
 #[test]
 fn test_named_unit() {
     let named_unit = NamedUnit;
@@ -438,3 +446,32 @@ fn test_de_enum_map() {
         }
     );
 }
+
+#[test]
+fn test_lifetimes() {
+    let value = 5;
+    let lifetime = Lifetimes::LifetimeSeq(&value);
+    assert_eq!(
+        json::to_string(&lifetime).unwrap(),
+        "{\"LifetimeSeq\":[5]}"
+    );
+
+    let lifetime = Lifetimes::NoLifetimeSeq(5);
+    assert_eq!(
+        json::to_string(&lifetime).unwrap(),
+        "{\"NoLifetimeSeq\":[5]}"
+    );
+
+    let value = 5;
+    let lifetime = Lifetimes::LifetimeMap { a: &value };
+    assert_eq!(
+        json::to_string(&lifetime).unwrap(),
+        "{\"LifetimeMap\":{\"a\":5}}"
+    );
+
+    let lifetime = Lifetimes::NoLifetimeMap { a: 5 };
+    assert_eq!(
+        json::to_string(&lifetime).unwrap(),
+        "{\"NoLifetimeMap\":{\"a\":5}}"
+    );
+}