Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2733 insertions, 0 deletions

diff --git a/third_party/rust/serde/src/de/impls.rs b/third_party/rust/serde/src/de/impls.rs
new file mode 100644
index 0000000000..a257d9e2f4
--- /dev/null
+++ b/third_party/rust/serde/src/de/impls.rs
@@ -0,0 +1,2733 @@
+use lib::*;
+
+use de::{
+    Deserialize, Deserializer, EnumAccess, Error, SeqAccess, Unexpected, VariantAccess, Visitor,
+};
+
+#[cfg(any(feature = "std", feature = "alloc", not(no_core_duration)))]
+use de::MapAccess;
+
+use seed::InPlaceSeed;
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+use __private::size_hint;
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct UnitVisitor;
+
+impl<'de> Visitor<'de> for UnitVisitor {
+    type Value = ();
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("unit")
+    }
+
+    fn visit_unit<E>(self) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(())
+    }
+}
+
+impl<'de> Deserialize<'de> for () {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_unit(UnitVisitor)
+    }
+}
+
+#[cfg(feature = "unstable")]
+impl<'de> Deserialize<'de> for ! {
+    fn deserialize<D>(_deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Err(Error::custom("cannot deserialize `!`"))
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct BoolVisitor;
+
+impl<'de> Visitor<'de> for BoolVisitor {
+    type Value = bool;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a boolean")
+    }
+
+    fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v)
+    }
+}
+
+impl<'de> Deserialize<'de> for bool {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_bool(BoolVisitor)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+macro_rules! impl_deserialize_num {
+    ($primitive:ident, $nonzero:ident $(cfg($($cfg:tt)*))*, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => {
+        impl_deserialize_num!($primitive, $deserialize $($method!($($val : $visit)*);)*);
+
+        #[cfg(all(not(no_num_nonzero), $($($cfg)*)*))]
+        impl<'de> Deserialize<'de> for num::$nonzero {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct NonZeroVisitor;
+
+                impl<'de> Visitor<'de> for NonZeroVisitor {
+                    type Value = num::$nonzero;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str(concat!("a nonzero ", stringify!($primitive)))
+                    }
+
+                    $($($method!(nonzero $primitive $val : $visit);)*)*
+                }
+
+                deserializer.$deserialize(NonZeroVisitor)
+            }
+        }
+    };
+
+    ($primitive:ident, $deserialize:ident $($method:ident!($($val:ident : $visit:ident)*);)*) => {
+        impl<'de> Deserialize<'de> for $primitive {
+            #[inline]
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct PrimitiveVisitor;
+
+                impl<'de> Visitor<'de> for PrimitiveVisitor {
+                    type Value = $primitive;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str(stringify!($primitive))
+                    }
+
+                    $($($method!($val : $visit);)*)*
+                }
+
+                deserializer.$deserialize(PrimitiveVisitor)
+            }
+        }
+    };
+}
+
+macro_rules! num_self {
+    ($ty:ident : $visit:ident) => {
+        #[inline]
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            Ok(v)
+        }
+    };
+
+    (nonzero $primitive:ident $ty:ident : $visit:ident) => {
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if let Some(nonzero) = Self::Value::new(v) {
+                Ok(nonzero)
+            } else {
+                Err(Error::invalid_value(Unexpected::Unsigned(0), &self))
+            }
+        }
+    };
+}
+
+macro_rules! num_as_self {
+    ($ty:ident : $visit:ident) => {
+        #[inline]
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            Ok(v as Self::Value)
+        }
+    };
+
+    (nonzero $primitive:ident $ty:ident : $visit:ident) => {
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if let Some(nonzero) = Self::Value::new(v as $primitive) {
+                Ok(nonzero)
+            } else {
+                Err(Error::invalid_value(Unexpected::Unsigned(0), &self))
+            }
+        }
+    };
+}
+
+macro_rules! int_to_int {
+    ($ty:ident : $visit:ident) => {
+        #[inline]
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if Self::Value::min_value() as i64 <= v as i64
+                && v as i64 <= Self::Value::max_value() as i64
+            {
+                Ok(v as Self::Value)
+            } else {
+                Err(Error::invalid_value(Unexpected::Signed(v as i64), &self))
+            }
+        }
+    };
+
+    (nonzero $primitive:ident $ty:ident : $visit:ident) => {
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if $primitive::min_value() as i64 <= v as i64
+                && v as i64 <= $primitive::max_value() as i64
+            {
+                if let Some(nonzero) = Self::Value::new(v as $primitive) {
+                    return Ok(nonzero);
+                }
+            }
+            Err(Error::invalid_value(Unexpected::Signed(v as i64), &self))
+        }
+    };
+}
+
+macro_rules! int_to_uint {
+    ($ty:ident : $visit:ident) => {
+        #[inline]
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if 0 <= v && v as u64 <= Self::Value::max_value() as u64 {
+                Ok(v as Self::Value)
+            } else {
+                Err(Error::invalid_value(Unexpected::Signed(v as i64), &self))
+            }
+        }
+    };
+
+    (nonzero $primitive:ident $ty:ident : $visit:ident) => {
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if 0 < v && v as u64 <= $primitive::max_value() as u64 {
+                if let Some(nonzero) = Self::Value::new(v as $primitive) {
+                    return Ok(nonzero);
+                }
+            }
+            Err(Error::invalid_value(Unexpected::Signed(v as i64), &self))
+        }
+    };
+}
+
+macro_rules! uint_to_self {
+    ($ty:ident : $visit:ident) => {
+        #[inline]
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if v as u64 <= Self::Value::max_value() as u64 {
+                Ok(v as Self::Value)
+            } else {
+                Err(Error::invalid_value(Unexpected::Unsigned(v as u64), &self))
+            }
+        }
+    };
+
+    (nonzero $primitive:ident $ty:ident : $visit:ident) => {
+        fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+        where
+            E: Error,
+        {
+            if v as u64 <= $primitive::max_value() as u64 {
+                if let Some(nonzero) = Self::Value::new(v as $primitive) {
+                    return Ok(nonzero);
+                }
+            }
+            Err(Error::invalid_value(Unexpected::Unsigned(v as u64), &self))
+        }
+    };
+}
+
+impl_deserialize_num! {
+    i8, NonZeroI8 cfg(not(no_num_nonzero_signed)), deserialize_i8
+    num_self!(i8:visit_i8);
+    int_to_int!(i16:visit_i16 i32:visit_i32 i64:visit_i64);
+    uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    i16, NonZeroI16 cfg(not(no_num_nonzero_signed)), deserialize_i16
+    num_self!(i16:visit_i16);
+    num_as_self!(i8:visit_i8);
+    int_to_int!(i32:visit_i32 i64:visit_i64);
+    uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    i32, NonZeroI32 cfg(not(no_num_nonzero_signed)), deserialize_i32
+    num_self!(i32:visit_i32);
+    num_as_self!(i8:visit_i8 i16:visit_i16);
+    int_to_int!(i64:visit_i64);
+    uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    i64, NonZeroI64 cfg(not(no_num_nonzero_signed)), deserialize_i64
+    num_self!(i64:visit_i64);
+    num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32);
+    uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    isize, NonZeroIsize cfg(not(no_num_nonzero_signed)), deserialize_i64
+    num_as_self!(i8:visit_i8 i16:visit_i16);
+    int_to_int!(i32:visit_i32 i64:visit_i64);
+    uint_to_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    u8, NonZeroU8, deserialize_u8
+    num_self!(u8:visit_u8);
+    int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+    uint_to_self!(u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    u16, NonZeroU16, deserialize_u16
+    num_self!(u16:visit_u16);
+    num_as_self!(u8:visit_u8);
+    int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+    uint_to_self!(u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    u32, NonZeroU32, deserialize_u32
+    num_self!(u32:visit_u32);
+    num_as_self!(u8:visit_u8 u16:visit_u16);
+    int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+    uint_to_self!(u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    u64, NonZeroU64, deserialize_u64
+    num_self!(u64:visit_u64);
+    num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32);
+    int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+}
+
+impl_deserialize_num! {
+    usize, NonZeroUsize, deserialize_u64
+    num_as_self!(u8:visit_u8 u16:visit_u16);
+    int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+    uint_to_self!(u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    f32, deserialize_f32
+    num_self!(f32:visit_f32);
+    num_as_self!(f64:visit_f64);
+    num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+    num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+impl_deserialize_num! {
+    f64, deserialize_f64
+    num_self!(f64:visit_f64);
+    num_as_self!(f32:visit_f32);
+    num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+    num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+}
+
+serde_if_integer128! {
+    macro_rules! num_128 {
+        ($ty:ident : $visit:ident) => {
+            fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                if v as i128 >= Self::Value::min_value() as i128
+                    && v as u128 <= Self::Value::max_value() as u128
+                {
+                    Ok(v as Self::Value)
+                } else {
+                    Err(Error::invalid_value(
+                        Unexpected::Other(stringify!($ty)),
+                        &self,
+                    ))
+                }
+            }
+        };
+
+        (nonzero $primitive:ident $ty:ident : $visit:ident) => {
+            fn $visit<E>(self, v: $ty) -> Result<Self::Value, E>
+            where
+                E: Error,
+            {
+                if v as i128 >= $primitive::min_value() as i128
+                    && v as u128 <= $primitive::max_value() as u128
+                {
+                    if let Some(nonzero) = Self::Value::new(v as $primitive) {
+                        Ok(nonzero)
+                    } else {
+                        Err(Error::invalid_value(Unexpected::Unsigned(0), &self))
+                    }
+                } else {
+                    Err(Error::invalid_value(
+                        Unexpected::Other(stringify!($ty)),
+                        &self,
+                    ))
+                }
+            }
+        };
+    }
+
+    impl_deserialize_num! {
+        i128, NonZeroI128 cfg(not(no_num_nonzero_signed)), deserialize_i128
+        num_self!(i128:visit_i128);
+        num_as_self!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+        num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+        num_128!(u128:visit_u128);
+    }
+
+    impl_deserialize_num! {
+        u128, NonZeroU128, deserialize_u128
+        num_self!(u128:visit_u128);
+        num_as_self!(u8:visit_u8 u16:visit_u16 u32:visit_u32 u64:visit_u64);
+        int_to_uint!(i8:visit_i8 i16:visit_i16 i32:visit_i32 i64:visit_i64);
+        num_128!(i128:visit_i128);
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct CharVisitor;
+
+impl<'de> Visitor<'de> for CharVisitor {
+    type Value = char;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a character")
+    }
+
+    #[inline]
+    fn visit_char<E>(self, v: char) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v)
+    }
+
+    #[inline]
+    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        let mut iter = v.chars();
+        match (iter.next(), iter.next()) {
+            (Some(c), None) => Ok(c),
+            _ => Err(Error::invalid_value(Unexpected::Str(v), &self)),
+        }
+    }
+}
+
+impl<'de> Deserialize<'de> for char {
+    #[inline]
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_char(CharVisitor)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+struct StringVisitor;
+#[cfg(any(feature = "std", feature = "alloc"))]
+struct StringInPlaceVisitor<'a>(&'a mut String);
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de> Visitor<'de> for StringVisitor {
+    type Value = String;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a string")
+    }
+
+    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v.to_owned())
+    }
+
+    fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v)
+    }
+
+    fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        match str::from_utf8(v) {
+            Ok(s) => Ok(s.to_owned()),
+            Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)),
+        }
+    }
+
+    fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        match String::from_utf8(v) {
+            Ok(s) => Ok(s),
+            Err(e) => Err(Error::invalid_value(
+                Unexpected::Bytes(&e.into_bytes()),
+                &self,
+            )),
+        }
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'a, 'de> Visitor<'de> for StringInPlaceVisitor<'a> {
+    type Value = ();
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a string")
+    }
+
+    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        self.0.clear();
+        self.0.push_str(v);
+        Ok(())
+    }
+
+    fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        *self.0 = v;
+        Ok(())
+    }
+
+    fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        match str::from_utf8(v) {
+            Ok(s) => {
+                self.0.clear();
+                self.0.push_str(s);
+                Ok(())
+            }
+            Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)),
+        }
+    }
+
+    fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        match String::from_utf8(v) {
+            Ok(s) => {
+                *self.0 = s;
+                Ok(())
+            }
+            Err(e) => Err(Error::invalid_value(
+                Unexpected::Bytes(&e.into_bytes()),
+                &self,
+            )),
+        }
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de> Deserialize<'de> for String {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_string(StringVisitor)
+    }
+
+    fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_string(StringInPlaceVisitor(place))
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct StrVisitor;
+
+impl<'a> Visitor<'a> for StrVisitor {
+    type Value = &'a str;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a borrowed string")
+    }
+
+    fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v) // so easy
+    }
+
+    fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        str::from_utf8(v).map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self))
+    }
+}
+
+impl<'de: 'a, 'a> Deserialize<'de> for &'a str {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_str(StrVisitor)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct BytesVisitor;
+
+impl<'a> Visitor<'a> for BytesVisitor {
+    type Value = &'a [u8];
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a borrowed byte array")
+    }
+
+    fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v)
+    }
+
+    fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v.as_bytes())
+    }
+}
+
+impl<'de: 'a, 'a> Deserialize<'de> for &'a [u8] {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_bytes(BytesVisitor)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(feature = "std")]
+struct CStringVisitor;
+
+#[cfg(feature = "std")]
+impl<'de> Visitor<'de> for CStringVisitor {
+    type Value = CString;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("byte array")
+    }
+
+    fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+    where
+        A: SeqAccess<'de>,
+    {
+        let len = size_hint::cautious(seq.size_hint());
+        let mut values = Vec::with_capacity(len);
+
+        while let Some(value) = try!(seq.next_element()) {
+            values.push(value);
+        }
+
+        CString::new(values).map_err(Error::custom)
+    }
+
+    fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        CString::new(v).map_err(Error::custom)
+    }
+
+    fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        CString::new(v).map_err(Error::custom)
+    }
+
+    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        CString::new(v).map_err(Error::custom)
+    }
+
+    fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        CString::new(v).map_err(Error::custom)
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'de> Deserialize<'de> for CString {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_byte_buf(CStringVisitor)
+    }
+}
+
+macro_rules! forwarded_impl {
+    (
+        $(#[doc = $doc:tt])*
+        ($($id:ident),*), $ty:ty, $func:expr
+    ) => {
+        $(#[doc = $doc])*
+        impl<'de $(, $id : Deserialize<'de>,)*> Deserialize<'de> for $ty {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                Deserialize::deserialize(deserializer).map($func)
+            }
+        }
+    }
+}
+
+#[cfg(all(feature = "std", not(no_de_boxed_c_str)))]
+forwarded_impl!((), Box<CStr>, CString::into_boxed_c_str);
+
+#[cfg(not(no_core_reverse))]
+forwarded_impl!((T), Reverse<T>, Reverse);
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct OptionVisitor<T> {
+    marker: PhantomData<T>,
+}
+
+impl<'de, T> Visitor<'de> for OptionVisitor<T>
+where
+    T: Deserialize<'de>,
+{
+    type Value = Option<T>;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("option")
+    }
+
+    #[inline]
+    fn visit_unit<E>(self) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(None)
+    }
+
+    #[inline]
+    fn visit_none<E>(self) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(None)
+    }
+
+    #[inline]
+    fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        T::deserialize(deserializer).map(Some)
+    }
+
+    fn __private_visit_untagged_option<D>(self, deserializer: D) -> Result<Self::Value, ()>
+    where
+        D: Deserializer<'de>,
+    {
+        Ok(T::deserialize(deserializer).ok())
+    }
+}
+
+impl<'de, T> Deserialize<'de> for Option<T>
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_option(OptionVisitor {
+            marker: PhantomData,
+        })
+    }
+
+    // The Some variant's repr is opaque, so we can't play cute tricks with its
+    // tag to have deserialize_in_place build the content in place unconditionally.
+    //
+    // FIXME: investigate whether branching on the old value being Some to
+    // deserialize_in_place the value is profitable (probably data-dependent?)
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct PhantomDataVisitor<T: ?Sized> {
+    marker: PhantomData<T>,
+}
+
+impl<'de, T: ?Sized> Visitor<'de> for PhantomDataVisitor<T> {
+    type Value = PhantomData<T>;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("unit")
+    }
+
+    #[inline]
+    fn visit_unit<E>(self) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(PhantomData)
+    }
+}
+
+impl<'de, T: ?Sized> Deserialize<'de> for PhantomData<T> {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let visitor = PhantomDataVisitor {
+            marker: PhantomData,
+        };
+        deserializer.deserialize_unit_struct("PhantomData", visitor)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+macro_rules! seq_impl {
+    (
+        $ty:ident <T $(: $tbound1:ident $(+ $tbound2:ident)*)* $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)*>,
+        $access:ident,
+        $clear:expr,
+        $with_capacity:expr,
+        $reserve:expr,
+        $insert:expr
+    ) => {
+        impl<'de, T $(, $typaram)*> Deserialize<'de> for $ty<T $(, $typaram)*>
+        where
+            T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*,
+            $($typaram: $bound1 $(+ $bound2)*,)*
+        {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct SeqVisitor<T $(, $typaram)*> {
+                    marker: PhantomData<$ty<T $(, $typaram)*>>,
+                }
+
+                impl<'de, T $(, $typaram)*> Visitor<'de> for SeqVisitor<T $(, $typaram)*>
+                where
+                    T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*,
+                    $($typaram: $bound1 $(+ $bound2)*,)*
+                {
+                    type Value = $ty<T $(, $typaram)*>;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str("a sequence")
+                    }
+
+                    #[inline]
+                    fn visit_seq<A>(self, mut $access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: SeqAccess<'de>,
+                    {
+                        let mut values = $with_capacity;
+
+                        while let Some(value) = try!($access.next_element()) {
+                            $insert(&mut values, value);
+                        }
+
+                        Ok(values)
+                    }
+                }
+
+                let visitor = SeqVisitor { marker: PhantomData };
+                deserializer.deserialize_seq(visitor)
+            }
+
+            fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct SeqInPlaceVisitor<'a, T: 'a $(, $typaram: 'a)*>(&'a mut $ty<T $(, $typaram)*>);
+
+                impl<'a, 'de, T $(, $typaram)*> Visitor<'de> for SeqInPlaceVisitor<'a, T $(, $typaram)*>
+                where
+                    T: Deserialize<'de> $(+ $tbound1 $(+ $tbound2)*)*,
+                    $($typaram: $bound1 $(+ $bound2)*,)*
+                {
+                    type Value = ();
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str("a sequence")
+                    }
+
+                    #[inline]
+                    fn visit_seq<A>(mut self, mut $access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: SeqAccess<'de>,
+                    {
+                        $clear(&mut self.0);
+                        $reserve(&mut self.0, size_hint::cautious($access.size_hint()));
+
+                        // FIXME: try to overwrite old values here? (Vec, VecDeque, LinkedList)
+                        while let Some(value) = try!($access.next_element()) {
+                            $insert(&mut self.0, value);
+                        }
+
+                        Ok(())
+                    }
+                }
+
+                deserializer.deserialize_seq(SeqInPlaceVisitor(place))
+            }
+        }
+    }
+}
+
+// Dummy impl of reserve
+#[cfg(any(feature = "std", feature = "alloc"))]
+fn nop_reserve<T>(_seq: T, _n: usize) {}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+seq_impl!(
+    BinaryHeap<T: Ord>,
+    seq,
+    BinaryHeap::clear,
+    BinaryHeap::with_capacity(size_hint::cautious(seq.size_hint())),
+    BinaryHeap::reserve,
+    BinaryHeap::push
+);
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+seq_impl!(
+    BTreeSet<T: Eq + Ord>,
+    seq,
+    BTreeSet::clear,
+    BTreeSet::new(),
+    nop_reserve,
+    BTreeSet::insert
+);
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+seq_impl!(
+    LinkedList<T>,
+    seq,
+    LinkedList::clear,
+    LinkedList::new(),
+    nop_reserve,
+    LinkedList::push_back
+);
+
+#[cfg(feature = "std")]
+seq_impl!(
+    HashSet<T: Eq + Hash, S: BuildHasher + Default>,
+    seq,
+    HashSet::clear,
+    HashSet::with_capacity_and_hasher(size_hint::cautious(seq.size_hint()), S::default()),
+    HashSet::reserve,
+    HashSet::insert);
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+seq_impl!(
+    VecDeque<T>,
+    seq,
+    VecDeque::clear,
+    VecDeque::with_capacity(size_hint::cautious(seq.size_hint())),
+    VecDeque::reserve,
+    VecDeque::push_back
+);
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de, T> Deserialize<'de> for Vec<T>
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct VecVisitor<T> {
+            marker: PhantomData<T>,
+        }
+
+        impl<'de, T> Visitor<'de> for VecVisitor<T>
+        where
+            T: Deserialize<'de>,
+        {
+            type Value = Vec<T>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("a sequence")
+            }
+
+            fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let mut values = Vec::with_capacity(size_hint::cautious(seq.size_hint()));
+
+                while let Some(value) = try!(seq.next_element()) {
+                    values.push(value);
+                }
+
+                Ok(values)
+            }
+        }
+
+        let visitor = VecVisitor {
+            marker: PhantomData,
+        };
+        deserializer.deserialize_seq(visitor)
+    }
+
+    fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        struct VecInPlaceVisitor<'a, T: 'a>(&'a mut Vec<T>);
+
+        impl<'a, 'de, T> Visitor<'de> for VecInPlaceVisitor<'a, T>
+        where
+            T: Deserialize<'de>,
+        {
+            type Value = ();
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("a sequence")
+            }
+
+            fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let hint = size_hint::cautious(seq.size_hint());
+                if let Some(additional) = hint.checked_sub(self.0.len()) {
+                    self.0.reserve(additional);
+                }
+
+                for i in 0..self.0.len() {
+                    let next = {
+                        let next_place = InPlaceSeed(&mut self.0[i]);
+                        try!(seq.next_element_seed(next_place))
+                    };
+                    if next.is_none() {
+                        self.0.truncate(i);
+                        return Ok(());
+                    }
+                }
+
+                while let Some(value) = try!(seq.next_element()) {
+                    self.0.push(value);
+                }
+
+                Ok(())
+            }
+        }
+
+        deserializer.deserialize_seq(VecInPlaceVisitor(place))
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct ArrayVisitor<A> {
+    marker: PhantomData<A>,
+}
+struct ArrayInPlaceVisitor<'a, A: 'a>(&'a mut A);
+
+impl<A> ArrayVisitor<A> {
+    fn new() -> Self {
+        ArrayVisitor {
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<'de, T> Visitor<'de> for ArrayVisitor<[T; 0]> {
+    type Value = [T; 0];
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("an empty array")
+    }
+
+    #[inline]
+    fn visit_seq<A>(self, _: A) -> Result<Self::Value, A::Error>
+    where
+        A: SeqAccess<'de>,
+    {
+        Ok([])
+    }
+}
+
+// Does not require T: Deserialize<'de>.
+impl<'de, T> Deserialize<'de> for [T; 0] {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_tuple(0, ArrayVisitor::<[T; 0]>::new())
+    }
+}
+
+macro_rules! array_impls {
+    ($($len:expr => ($($n:tt)+))+) => {
+        $(
+            impl<'de, T> Visitor<'de> for ArrayVisitor<[T; $len]>
+            where
+                T: Deserialize<'de>,
+            {
+                type Value = [T; $len];
+
+                fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                    formatter.write_str(concat!("an array of length ", $len))
+                }
+
+                #[inline]
+                fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+                where
+                    A: SeqAccess<'de>,
+                {
+                    Ok([$(
+                        match try!(seq.next_element()) {
+                            Some(val) => val,
+                            None => return Err(Error::invalid_length($n, &self)),
+                        }
+                    ),+])
+                }
+            }
+
+            impl<'a, 'de, T> Visitor<'de> for ArrayInPlaceVisitor<'a, [T; $len]>
+            where
+                T: Deserialize<'de>,
+            {
+                type Value = ();
+
+                fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                    formatter.write_str(concat!("an array of length ", $len))
+                }
+
+                #[inline]
+                fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+                where
+                    A: SeqAccess<'de>,
+                {
+                    let mut fail_idx = None;
+                    for (idx, dest) in self.0[..].iter_mut().enumerate() {
+                        if try!(seq.next_element_seed(InPlaceSeed(dest))).is_none() {
+                            fail_idx = Some(idx);
+                            break;
+                        }
+                    }
+                    if let Some(idx) = fail_idx {
+                        return Err(Error::invalid_length(idx, &self));
+                    }
+                    Ok(())
+                }
+            }
+
+            impl<'de, T> Deserialize<'de> for [T; $len]
+            where
+                T: Deserialize<'de>,
+            {
+                fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    deserializer.deserialize_tuple($len, ArrayVisitor::<[T; $len]>::new())
+                }
+
+                fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    deserializer.deserialize_tuple($len, ArrayInPlaceVisitor(place))
+                }
+            }
+        )+
+    }
+}
+
+array_impls! {
+    1 => (0)
+    2 => (0 1)
+    3 => (0 1 2)
+    4 => (0 1 2 3)
+    5 => (0 1 2 3 4)
+    6 => (0 1 2 3 4 5)
+    7 => (0 1 2 3 4 5 6)
+    8 => (0 1 2 3 4 5 6 7)
+    9 => (0 1 2 3 4 5 6 7 8)
+    10 => (0 1 2 3 4 5 6 7 8 9)
+    11 => (0 1 2 3 4 5 6 7 8 9 10)
+    12 => (0 1 2 3 4 5 6 7 8 9 10 11)
+    13 => (0 1 2 3 4 5 6 7 8 9 10 11 12)
+    14 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13)
+    15 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14)
+    16 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15)
+    17 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16)
+    18 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17)
+    19 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18)
+    20 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19)
+    21 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20)
+    22 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21)
+    23 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22)
+    24 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23)
+    25 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24)
+    26 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25)
+    27 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26)
+    28 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27)
+    29 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28)
+    30 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29)
+    31 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30)
+    32 => (0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31)
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+macro_rules! tuple_impls {
+    ($($len:tt => ($($n:tt $name:ident)+))+) => {
+        $(
+            impl<'de, $($name: Deserialize<'de>),+> Deserialize<'de> for ($($name,)+) {
+                #[inline]
+                fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    struct TupleVisitor<$($name,)+> {
+                        marker: PhantomData<($($name,)+)>,
+                    }
+
+                    impl<'de, $($name: Deserialize<'de>),+> Visitor<'de> for TupleVisitor<$($name,)+> {
+                        type Value = ($($name,)+);
+
+                        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                            formatter.write_str(concat!("a tuple of size ", $len))
+                        }
+
+                        #[inline]
+                        #[allow(non_snake_case)]
+                        fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+                        where
+                            A: SeqAccess<'de>,
+                        {
+                            $(
+                                let $name = match try!(seq.next_element()) {
+                                    Some(value) => value,
+                                    None => return Err(Error::invalid_length($n, &self)),
+                                };
+                            )+
+
+                            Ok(($($name,)+))
+                        }
+                    }
+
+                    deserializer.deserialize_tuple($len, TupleVisitor { marker: PhantomData })
+                }
+
+                #[inline]
+                fn deserialize_in_place<D>(deserializer: D, place: &mut Self) -> Result<(), D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    struct TupleInPlaceVisitor<'a, $($name: 'a,)+>(&'a mut ($($name,)+));
+
+                    impl<'a, 'de, $($name: Deserialize<'de>),+> Visitor<'de> for TupleInPlaceVisitor<'a, $($name,)+> {
+                        type Value = ();
+
+                        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                            formatter.write_str(concat!("a tuple of size ", $len))
+                        }
+
+                        #[inline]
+                        #[allow(non_snake_case)]
+                        fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+                        where
+                            A: SeqAccess<'de>,
+                        {
+                            $(
+                                if try!(seq.next_element_seed(InPlaceSeed(&mut (self.0).$n))).is_none() {
+                                    return Err(Error::invalid_length($n, &self));
+                                }
+                            )+
+
+                            Ok(())
+                        }
+                    }
+
+                    deserializer.deserialize_tuple($len, TupleInPlaceVisitor(place))
+                }
+            }
+        )+
+    }
+}
+
+tuple_impls! {
+    1  => (0 T0)
+    2  => (0 T0 1 T1)
+    3  => (0 T0 1 T1 2 T2)
+    4  => (0 T0 1 T1 2 T2 3 T3)
+    5  => (0 T0 1 T1 2 T2 3 T3 4 T4)
+    6  => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5)
+    7  => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6)
+    8  => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7)
+    9  => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8)
+    10 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9)
+    11 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10)
+    12 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11)
+    13 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12)
+    14 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13)
+    15 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14)
+    16 => (0 T0 1 T1 2 T2 3 T3 4 T4 5 T5 6 T6 7 T7 8 T8 9 T9 10 T10 11 T11 12 T12 13 T13 14 T14 15 T15)
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+macro_rules! map_impl {
+    (
+        $ty:ident <K $(: $kbound1:ident $(+ $kbound2:ident)*)*, V $(, $typaram:ident : $bound1:ident $(+ $bound2:ident)*)*>,
+        $access:ident,
+        $with_capacity:expr
+    ) => {
+        impl<'de, K, V $(, $typaram)*> Deserialize<'de> for $ty<K, V $(, $typaram)*>
+        where
+            K: Deserialize<'de> $(+ $kbound1 $(+ $kbound2)*)*,
+            V: Deserialize<'de>,
+            $($typaram: $bound1 $(+ $bound2)*),*
+        {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct MapVisitor<K, V $(, $typaram)*> {
+                    marker: PhantomData<$ty<K, V $(, $typaram)*>>,
+                }
+
+                impl<'de, K, V $(, $typaram)*> Visitor<'de> for MapVisitor<K, V $(, $typaram)*>
+                where
+                    K: Deserialize<'de> $(+ $kbound1 $(+ $kbound2)*)*,
+                    V: Deserialize<'de>,
+                    $($typaram: $bound1 $(+ $bound2)*),*
+                {
+                    type Value = $ty<K, V $(, $typaram)*>;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str("a map")
+                    }
+
+                    #[inline]
+                    fn visit_map<A>(self, mut $access: A) -> Result<Self::Value, A::Error>
+                    where
+                        A: MapAccess<'de>,
+                    {
+                        let mut values = $with_capacity;
+
+                        while let Some((key, value)) = try!($access.next_entry()) {
+                            values.insert(key, value);
+                        }
+
+                        Ok(values)
+                    }
+                }
+
+                let visitor = MapVisitor { marker: PhantomData };
+                deserializer.deserialize_map(visitor)
+            }
+        }
+    }
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+map_impl!(
+    BTreeMap<K: Ord, V>,
+    map,
+    BTreeMap::new());
+
+#[cfg(feature = "std")]
+map_impl!(
+    HashMap<K: Eq + Hash, V, S: BuildHasher + Default>,
+    map,
+    HashMap::with_capacity_and_hasher(size_hint::cautious(map.size_hint()), S::default()));
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(feature = "std")]
+macro_rules! parse_ip_impl {
+    ($expecting:tt $ty:ty; $size:tt) => {
+        impl<'de> Deserialize<'de> for $ty {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                if deserializer.is_human_readable() {
+                    deserializer.deserialize_str(FromStrVisitor::new($expecting))
+                } else {
+                    <[u8; $size]>::deserialize(deserializer).map(<$ty>::from)
+                }
+            }
+        }
+    };
+}
+
+#[cfg(feature = "std")]
+macro_rules! variant_identifier {
+    (
+        $name_kind:ident ($($variant:ident; $bytes:expr; $index:expr),*)
+        $expecting_message:expr,
+        $variants_name:ident
+    ) => {
+        enum $name_kind {
+            $($variant),*
+        }
+
+        static $variants_name: &'static [&'static str] = &[$(stringify!($variant)),*];
+
+        impl<'de> Deserialize<'de> for $name_kind {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct KindVisitor;
+
+                impl<'de> Visitor<'de> for KindVisitor {
+                    type Value = $name_kind;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str($expecting_message)
+                    }
+
+                    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            $(
+                                $index => Ok($name_kind :: $variant),
+                            )*
+                            _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self),),
+                        }
+                    }
+
+                    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            $(
+                                stringify!($variant) => Ok($name_kind :: $variant),
+                            )*
+                            _ => Err(Error::unknown_variant(value, $variants_name)),
+                        }
+                    }
+
+                    fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            $(
+                                $bytes => Ok($name_kind :: $variant),
+                            )*
+                            _ => {
+                                match str::from_utf8(value) {
+                                    Ok(value) => Err(Error::unknown_variant(value, $variants_name)),
+                                    Err(_) => Err(Error::invalid_value(Unexpected::Bytes(value), &self)),
+                                }
+                            }
+                        }
+                    }
+                }
+
+                deserializer.deserialize_identifier(KindVisitor)
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+macro_rules! deserialize_enum {
+    (
+        $name:ident $name_kind:ident ($($variant:ident; $bytes:expr; $index:expr),*)
+        $expecting_message:expr,
+        $deserializer:expr
+    ) => {
+        variant_identifier! {
+            $name_kind ($($variant; $bytes; $index),*)
+            $expecting_message,
+            VARIANTS
+        }
+
+        struct EnumVisitor;
+        impl<'de> Visitor<'de> for EnumVisitor {
+            type Value = $name;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str(concat!("a ", stringify!($name)))
+            }
+
+
+            fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+            where
+                A: EnumAccess<'de>,
+            {
+                match try!(data.variant()) {
+                    $(
+                        ($name_kind :: $variant, v) => v.newtype_variant().map($name :: $variant),
+                    )*
+                }
+            }
+        }
+        $deserializer.deserialize_enum(stringify!($name), VARIANTS, EnumVisitor)
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'de> Deserialize<'de> for net::IpAddr {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        if deserializer.is_human_readable() {
+            deserializer.deserialize_str(FromStrVisitor::new("IP address"))
+        } else {
+            use lib::net::IpAddr;
+            deserialize_enum! {
+                IpAddr IpAddrKind (V4; b"V4"; 0, V6; b"V6"; 1)
+                "`V4` or `V6`",
+                deserializer
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+parse_ip_impl!("IPv4 address" net::Ipv4Addr; 4);
+
+#[cfg(feature = "std")]
+parse_ip_impl!("IPv6 address" net::Ipv6Addr; 16);
+
+#[cfg(feature = "std")]
+macro_rules! parse_socket_impl {
+    ($expecting:tt $ty:ty, $new:expr) => {
+        impl<'de> Deserialize<'de> for $ty {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                if deserializer.is_human_readable() {
+                    deserializer.deserialize_str(FromStrVisitor::new($expecting))
+                } else {
+                    <(_, u16)>::deserialize(deserializer).map(|(ip, port)| $new(ip, port))
+                }
+            }
+        }
+    };
+}
+
+#[cfg(feature = "std")]
+impl<'de> Deserialize<'de> for net::SocketAddr {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        if deserializer.is_human_readable() {
+            deserializer.deserialize_str(FromStrVisitor::new("socket address"))
+        } else {
+            use lib::net::SocketAddr;
+            deserialize_enum! {
+                SocketAddr SocketAddrKind (V4; b"V4"; 0, V6; b"V6"; 1)
+                "`V4` or `V6`",
+                deserializer
+            }
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+parse_socket_impl!("IPv4 socket address" net::SocketAddrV4, net::SocketAddrV4::new);
+
+#[cfg(feature = "std")]
+parse_socket_impl!("IPv6 socket address" net::SocketAddrV6, |ip, port| net::SocketAddrV6::new(
+    ip, port, 0, 0
+));
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(feature = "std")]
+struct PathVisitor;
+
+#[cfg(feature = "std")]
+impl<'a> Visitor<'a> for PathVisitor {
+    type Value = &'a Path;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("a borrowed path")
+    }
+
+    fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(v.as_ref())
+    }
+
+    fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        str::from_utf8(v)
+            .map(AsRef::as_ref)
+            .map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self))
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'de: 'a, 'a> Deserialize<'de> for &'a Path {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_str(PathVisitor)
+    }
+}
+
+#[cfg(feature = "std")]
+struct PathBufVisitor;
+
+#[cfg(feature = "std")]
+impl<'de> Visitor<'de> for PathBufVisitor {
+    type Value = PathBuf;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("path string")
+    }
+
+    fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(From::from(v))
+    }
+
+    fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        Ok(From::from(v))
+    }
+
+    fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        str::from_utf8(v)
+            .map(From::from)
+            .map_err(|_| Error::invalid_value(Unexpected::Bytes(v), &self))
+    }
+
+    fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        String::from_utf8(v)
+            .map(From::from)
+            .map_err(|e| Error::invalid_value(Unexpected::Bytes(&e.into_bytes()), &self))
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'de> Deserialize<'de> for PathBuf {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_string(PathBufVisitor)
+    }
+}
+
+#[cfg(all(feature = "std", not(no_de_boxed_path)))]
+forwarded_impl!((), Box<Path>, PathBuf::into_boxed_path);
+
+////////////////////////////////////////////////////////////////////////////////
+
+// If this were outside of the serde crate, it would just use:
+//
+//    #[derive(Deserialize)]
+//    #[serde(variant_identifier)]
+#[cfg(all(feature = "std", any(unix, windows)))]
+variant_identifier! {
+    OsStringKind (Unix; b"Unix"; 0, Windows; b"Windows"; 1)
+    "`Unix` or `Windows`",
+    OSSTR_VARIANTS
+}
+
+#[cfg(all(feature = "std", any(unix, windows)))]
+struct OsStringVisitor;
+
+#[cfg(all(feature = "std", any(unix, windows)))]
+impl<'de> Visitor<'de> for OsStringVisitor {
+    type Value = OsString;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("os string")
+    }
+
+    #[cfg(unix)]
+    fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+    where
+        A: EnumAccess<'de>,
+    {
+        use std::os::unix::ffi::OsStringExt;
+
+        match try!(data.variant()) {
+            (OsStringKind::Unix, v) => v.newtype_variant().map(OsString::from_vec),
+            (OsStringKind::Windows, _) => Err(Error::custom(
+                "cannot deserialize Windows OS string on Unix",
+            )),
+        }
+    }
+
+    #[cfg(windows)]
+    fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+    where
+        A: EnumAccess<'de>,
+    {
+        use std::os::windows::ffi::OsStringExt;
+
+        match try!(data.variant()) {
+            (OsStringKind::Windows, v) => v
+                .newtype_variant::<Vec<u16>>()
+                .map(|vec| OsString::from_wide(&vec)),
+            (OsStringKind::Unix, _) => Err(Error::custom(
+                "cannot deserialize Unix OS string on Windows",
+            )),
+        }
+    }
+}
+
+#[cfg(all(feature = "std", any(unix, windows)))]
+impl<'de> Deserialize<'de> for OsString {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_enum("OsString", OSSTR_VARIANTS, OsStringVisitor)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+forwarded_impl!((T), Box<T>, Box::new);
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+forwarded_impl!((T), Box<[T]>, Vec::into_boxed_slice);
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+forwarded_impl!((), Box<str>, String::into_boxed_str);
+
+#[cfg(all(no_de_rc_dst, feature = "rc", any(feature = "std", feature = "alloc")))]
+forwarded_impl! {
+    /// This impl requires the [`"rc"`] Cargo feature of Serde.
+    ///
+    /// Deserializing a data structure containing `Arc` will not attempt to
+    /// deduplicate `Arc` references to the same data. Every deserialized `Arc`
+    /// will end up with a strong count of 1.
+    ///
+    /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc
+    (T), Arc<T>, Arc::new
+}
+
+#[cfg(all(no_de_rc_dst, feature = "rc", any(feature = "std", feature = "alloc")))]
+forwarded_impl! {
+    /// This impl requires the [`"rc"`] Cargo feature of Serde.
+    ///
+    /// Deserializing a data structure containing `Rc` will not attempt to
+    /// deduplicate `Rc` references to the same data. Every deserialized `Rc`
+    /// will end up with a strong count of 1.
+    ///
+    /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc
+    (T), Rc<T>, Rc::new
+}
+
+#[cfg(any(feature = "std", feature = "alloc"))]
+impl<'de, 'a, T: ?Sized> Deserialize<'de> for Cow<'a, T>
+where
+    T: ToOwned,
+    T::Owned: Deserialize<'de>,
+{
+    #[inline]
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        T::Owned::deserialize(deserializer).map(Cow::Owned)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+/// This impl requires the [`"rc"`] Cargo feature of Serde. The resulting
+/// `Weak<T>` has a reference count of 0 and cannot be upgraded.
+///
+/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc
+#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))]
+impl<'de, T: ?Sized> Deserialize<'de> for RcWeak<T>
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        try!(Option::<T>::deserialize(deserializer));
+        Ok(RcWeak::new())
+    }
+}
+
+/// This impl requires the [`"rc"`] Cargo feature of Serde. The resulting
+/// `Weak<T>` has a reference count of 0 and cannot be upgraded.
+///
+/// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc
+#[cfg(all(feature = "rc", any(feature = "std", feature = "alloc")))]
+impl<'de, T: ?Sized> Deserialize<'de> for ArcWeak<T>
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        try!(Option::<T>::deserialize(deserializer));
+        Ok(ArcWeak::new())
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(all(
+    not(no_de_rc_dst),
+    feature = "rc",
+    any(feature = "std", feature = "alloc")
+))]
+macro_rules! box_forwarded_impl {
+    (
+        $(#[doc = $doc:tt])*
+        $t:ident
+    ) => {
+        $(#[doc = $doc])*
+        impl<'de, T: ?Sized> Deserialize<'de> for $t<T>
+        where
+            Box<T>: Deserialize<'de>,
+        {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                Box::deserialize(deserializer).map(Into::into)
+            }
+        }
+    };
+}
+
+#[cfg(all(
+    not(no_de_rc_dst),
+    feature = "rc",
+    any(feature = "std", feature = "alloc")
+))]
+box_forwarded_impl! {
+    /// This impl requires the [`"rc"`] Cargo feature of Serde.
+    ///
+    /// Deserializing a data structure containing `Rc` will not attempt to
+    /// deduplicate `Rc` references to the same data. Every deserialized `Rc`
+    /// will end up with a strong count of 1.
+    ///
+    /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc
+    Rc
+}
+
+#[cfg(all(
+    not(no_de_rc_dst),
+    feature = "rc",
+    any(feature = "std", feature = "alloc")
+))]
+box_forwarded_impl! {
+    /// This impl requires the [`"rc"`] Cargo feature of Serde.
+    ///
+    /// Deserializing a data structure containing `Arc` will not attempt to
+    /// deduplicate `Arc` references to the same data. Every deserialized `Arc`
+    /// will end up with a strong count of 1.
+    ///
+    /// [`"rc"`]: https://serde.rs/feature-flags.html#-features-rc
+    Arc
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+impl<'de, T> Deserialize<'de> for Cell<T>
+where
+    T: Deserialize<'de> + Copy,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        T::deserialize(deserializer).map(Cell::new)
+    }
+}
+
+forwarded_impl!((T), RefCell<T>, RefCell::new);
+
+#[cfg(feature = "std")]
+forwarded_impl!((T), Mutex<T>, Mutex::new);
+
+#[cfg(feature = "std")]
+forwarded_impl!((T), RwLock<T>, RwLock::new);
+
+////////////////////////////////////////////////////////////////////////////////
+
+// This is a cleaned-up version of the impl generated by:
+//
+//     #[derive(Deserialize)]
+//     #[serde(deny_unknown_fields)]
+//     struct Duration {
+//         secs: u64,
+//         nanos: u32,
+//     }
+#[cfg(any(feature = "std", not(no_core_duration)))]
+impl<'de> Deserialize<'de> for Duration {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // If this were outside of the serde crate, it would just use:
+        //
+        //    #[derive(Deserialize)]
+        //    #[serde(field_identifier, rename_all = "lowercase")]
+        enum Field {
+            Secs,
+            Nanos,
+        }
+
+        impl<'de> Deserialize<'de> for Field {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct FieldVisitor;
+
+                impl<'de> Visitor<'de> for FieldVisitor {
+                    type Value = Field;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str("`secs` or `nanos`")
+                    }
+
+                    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            "secs" => Ok(Field::Secs),
+                            "nanos" => Ok(Field::Nanos),
+                            _ => Err(Error::unknown_field(value, FIELDS)),
+                        }
+                    }
+
+                    fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            b"secs" => Ok(Field::Secs),
+                            b"nanos" => Ok(Field::Nanos),
+                            _ => {
+                                let value = ::__private::from_utf8_lossy(value);
+                                Err(Error::unknown_field(&*value, FIELDS))
+                            }
+                        }
+                    }
+                }
+
+                deserializer.deserialize_identifier(FieldVisitor)
+            }
+        }
+
+        fn check_overflow<E>(secs: u64, nanos: u32) -> Result<(), E>
+        where
+            E: Error,
+        {
+            static NANOS_PER_SEC: u32 = 1_000_000_000;
+            match secs.checked_add((nanos / NANOS_PER_SEC) as u64) {
+                Some(_) => Ok(()),
+                None => Err(E::custom("overflow deserializing Duration")),
+            }
+        }
+
+        struct DurationVisitor;
+
+        impl<'de> Visitor<'de> for DurationVisitor {
+            type Value = Duration;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("struct Duration")
+            }
+
+            fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let secs: u64 = match try!(seq.next_element()) {
+                    Some(value) => value,
+                    None => {
+                        return Err(Error::invalid_length(0, &self));
+                    }
+                };
+                let nanos: u32 = match try!(seq.next_element()) {
+                    Some(value) => value,
+                    None => {
+                        return Err(Error::invalid_length(1, &self));
+                    }
+                };
+                try!(check_overflow(secs, nanos));
+                Ok(Duration::new(secs, nanos))
+            }
+
+            fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+            where
+                A: MapAccess<'de>,
+            {
+                let mut secs: Option<u64> = None;
+                let mut nanos: Option<u32> = None;
+                while let Some(key) = try!(map.next_key()) {
+                    match key {
+                        Field::Secs => {
+                            if secs.is_some() {
+                                return Err(<A::Error as Error>::duplicate_field("secs"));
+                            }
+                            secs = Some(try!(map.next_value()));
+                        }
+                        Field::Nanos => {
+                            if nanos.is_some() {
+                                return Err(<A::Error as Error>::duplicate_field("nanos"));
+                            }
+                            nanos = Some(try!(map.next_value()));
+                        }
+                    }
+                }
+                let secs = match secs {
+                    Some(secs) => secs,
+                    None => return Err(<A::Error as Error>::missing_field("secs")),
+                };
+                let nanos = match nanos {
+                    Some(nanos) => nanos,
+                    None => return Err(<A::Error as Error>::missing_field("nanos")),
+                };
+                try!(check_overflow(secs, nanos));
+                Ok(Duration::new(secs, nanos))
+            }
+        }
+
+        const FIELDS: &'static [&'static str] = &["secs", "nanos"];
+        deserializer.deserialize_struct("Duration", FIELDS, DurationVisitor)
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(feature = "std")]
+impl<'de> Deserialize<'de> for SystemTime {
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // Reuse duration
+        enum Field {
+            Secs,
+            Nanos,
+        }
+
+        impl<'de> Deserialize<'de> for Field {
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct FieldVisitor;
+
+                impl<'de> Visitor<'de> for FieldVisitor {
+                    type Value = Field;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str("`secs_since_epoch` or `nanos_since_epoch`")
+                    }
+
+                    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            "secs_since_epoch" => Ok(Field::Secs),
+                            "nanos_since_epoch" => Ok(Field::Nanos),
+                            _ => Err(Error::unknown_field(value, FIELDS)),
+                        }
+                    }
+
+                    fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            b"secs_since_epoch" => Ok(Field::Secs),
+                            b"nanos_since_epoch" => Ok(Field::Nanos),
+                            _ => {
+                                let value = String::from_utf8_lossy(value);
+                                Err(Error::unknown_field(&value, FIELDS))
+                            }
+                        }
+                    }
+                }
+
+                deserializer.deserialize_identifier(FieldVisitor)
+            }
+        }
+
+        fn check_overflow<E>(secs: u64, nanos: u32) -> Result<(), E>
+        where
+            E: Error,
+        {
+            static NANOS_PER_SEC: u32 = 1_000_000_000;
+            match secs.checked_add((nanos / NANOS_PER_SEC) as u64) {
+                Some(_) => Ok(()),
+                None => Err(E::custom("overflow deserializing SystemTime epoch offset")),
+            }
+        }
+
+        struct DurationVisitor;
+
+        impl<'de> Visitor<'de> for DurationVisitor {
+            type Value = Duration;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("struct SystemTime")
+            }
+
+            fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+            where
+                A: SeqAccess<'de>,
+            {
+                let secs: u64 = match try!(seq.next_element()) {
+                    Some(value) => value,
+                    None => {
+                        return Err(Error::invalid_length(0, &self));
+                    }
+                };
+                let nanos: u32 = match try!(seq.next_element()) {
+                    Some(value) => value,
+                    None => {
+                        return Err(Error::invalid_length(1, &self));
+                    }
+                };
+                try!(check_overflow(secs, nanos));
+                Ok(Duration::new(secs, nanos))
+            }
+
+            fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+            where
+                A: MapAccess<'de>,
+            {
+                let mut secs: Option<u64> = None;
+                let mut nanos: Option<u32> = None;
+                while let Some(key) = try!(map.next_key()) {
+                    match key {
+                        Field::Secs => {
+                            if secs.is_some() {
+                                return Err(<A::Error as Error>::duplicate_field(
+                                    "secs_since_epoch",
+                                ));
+                            }
+                            secs = Some(try!(map.next_value()));
+                        }
+                        Field::Nanos => {
+                            if nanos.is_some() {
+                                return Err(<A::Error as Error>::duplicate_field(
+                                    "nanos_since_epoch",
+                                ));
+                            }
+                            nanos = Some(try!(map.next_value()));
+                        }
+                    }
+                }
+                let secs = match secs {
+                    Some(secs) => secs,
+                    None => return Err(<A::Error as Error>::missing_field("secs_since_epoch")),
+                };
+                let nanos = match nanos {
+                    Some(nanos) => nanos,
+                    None => return Err(<A::Error as Error>::missing_field("nanos_since_epoch")),
+                };
+                try!(check_overflow(secs, nanos));
+                Ok(Duration::new(secs, nanos))
+            }
+        }
+
+        const FIELDS: &'static [&'static str] = &["secs_since_epoch", "nanos_since_epoch"];
+        let duration = try!(deserializer.deserialize_struct("SystemTime", FIELDS, DurationVisitor));
+        #[cfg(not(no_systemtime_checked_add))]
+        let ret = UNIX_EPOCH
+            .checked_add(duration)
+            .ok_or_else(|| D::Error::custom("overflow deserializing SystemTime"));
+        #[cfg(no_systemtime_checked_add)]
+        let ret = Ok(UNIX_EPOCH + duration);
+        ret
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+// Similar to:
+//
+//     #[derive(Deserialize)]
+//     #[serde(deny_unknown_fields)]
+//     struct Range {
+//         start: u64,
+//         end: u32,
+//     }
+impl<'de, Idx> Deserialize<'de> for Range<Idx>
+where
+    Idx: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let (start, end) = try!(deserializer.deserialize_struct(
+            "Range",
+            range::FIELDS,
+            range::RangeVisitor {
+                expecting: "struct Range",
+                phantom: PhantomData,
+            },
+        ));
+        Ok(start..end)
+    }
+}
+
+#[cfg(not(no_range_inclusive))]
+impl<'de, Idx> Deserialize<'de> for RangeInclusive<Idx>
+where
+    Idx: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let (start, end) = try!(deserializer.deserialize_struct(
+            "RangeInclusive",
+            range::FIELDS,
+            range::RangeVisitor {
+                expecting: "struct RangeInclusive",
+                phantom: PhantomData,
+            },
+        ));
+        Ok(RangeInclusive::new(start, end))
+    }
+}
+
+mod range {
+    use lib::*;
+
+    use de::{Deserialize, Deserializer, Error, MapAccess, SeqAccess, Visitor};
+
+    pub const FIELDS: &'static [&'static str] = &["start", "end"];
+
+    // If this were outside of the serde crate, it would just use:
+    //
+    //    #[derive(Deserialize)]
+    //    #[serde(field_identifier, rename_all = "lowercase")]
+    enum Field {
+        Start,
+        End,
+    }
+
+    impl<'de> Deserialize<'de> for Field {
+        fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+        where
+            D: Deserializer<'de>,
+        {
+            struct FieldVisitor;
+
+            impl<'de> Visitor<'de> for FieldVisitor {
+                type Value = Field;
+
+                fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                    formatter.write_str("`start` or `end`")
+                }
+
+                fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+                where
+                    E: Error,
+                {
+                    match value {
+                        "start" => Ok(Field::Start),
+                        "end" => Ok(Field::End),
+                        _ => Err(Error::unknown_field(value, FIELDS)),
+                    }
+                }
+
+                fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
+                where
+                    E: Error,
+                {
+                    match value {
+                        b"start" => Ok(Field::Start),
+                        b"end" => Ok(Field::End),
+                        _ => {
+                            let value = ::__private::from_utf8_lossy(value);
+                            Err(Error::unknown_field(&*value, FIELDS))
+                        }
+                    }
+                }
+            }
+
+            deserializer.deserialize_identifier(FieldVisitor)
+        }
+    }
+
+    pub struct RangeVisitor<Idx> {
+        pub expecting: &'static str,
+        pub phantom: PhantomData<Idx>,
+    }
+
+    impl<'de, Idx> Visitor<'de> for RangeVisitor<Idx>
+    where
+        Idx: Deserialize<'de>,
+    {
+        type Value = (Idx, Idx);
+
+        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+            formatter.write_str(self.expecting)
+        }
+
+        fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error>
+        where
+            A: SeqAccess<'de>,
+        {
+            let start: Idx = match try!(seq.next_element()) {
+                Some(value) => value,
+                None => {
+                    return Err(Error::invalid_length(0, &self));
+                }
+            };
+            let end: Idx = match try!(seq.next_element()) {
+                Some(value) => value,
+                None => {
+                    return Err(Error::invalid_length(1, &self));
+                }
+            };
+            Ok((start, end))
+        }
+
+        fn visit_map<A>(self, mut map: A) -> Result<Self::Value, A::Error>
+        where
+            A: MapAccess<'de>,
+        {
+            let mut start: Option<Idx> = None;
+            let mut end: Option<Idx> = None;
+            while let Some(key) = try!(map.next_key()) {
+                match key {
+                    Field::Start => {
+                        if start.is_some() {
+                            return Err(<A::Error as Error>::duplicate_field("start"));
+                        }
+                        start = Some(try!(map.next_value()));
+                    }
+                    Field::End => {
+                        if end.is_some() {
+                            return Err(<A::Error as Error>::duplicate_field("end"));
+                        }
+                        end = Some(try!(map.next_value()));
+                    }
+                }
+            }
+            let start = match start {
+                Some(start) => start,
+                None => return Err(<A::Error as Error>::missing_field("start")),
+            };
+            let end = match end {
+                Some(end) => end,
+                None => return Err(<A::Error as Error>::missing_field("end")),
+            };
+            Ok((start, end))
+        }
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+#[cfg(any(not(no_ops_bound), all(feature = "std", not(no_collections_bound))))]
+impl<'de, T> Deserialize<'de> for Bound<T>
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        enum Field {
+            Unbounded,
+            Included,
+            Excluded,
+        }
+
+        impl<'de> Deserialize<'de> for Field {
+            #[inline]
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct FieldVisitor;
+
+                impl<'de> Visitor<'de> for FieldVisitor {
+                    type Value = Field;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str("`Unbounded`, `Included` or `Excluded`")
+                    }
+
+                    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            0 => Ok(Field::Unbounded),
+                            1 => Ok(Field::Included),
+                            2 => Ok(Field::Excluded),
+                            _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self)),
+                        }
+                    }
+
+                    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            "Unbounded" => Ok(Field::Unbounded),
+                            "Included" => Ok(Field::Included),
+                            "Excluded" => Ok(Field::Excluded),
+                            _ => Err(Error::unknown_variant(value, VARIANTS)),
+                        }
+                    }
+
+                    fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            b"Unbounded" => Ok(Field::Unbounded),
+                            b"Included" => Ok(Field::Included),
+                            b"Excluded" => Ok(Field::Excluded),
+                            _ => match str::from_utf8(value) {
+                                Ok(value) => Err(Error::unknown_variant(value, VARIANTS)),
+                                Err(_) => {
+                                    Err(Error::invalid_value(Unexpected::Bytes(value), &self))
+                                }
+                            },
+                        }
+                    }
+                }
+
+                deserializer.deserialize_identifier(FieldVisitor)
+            }
+        }
+
+        struct BoundVisitor<T>(PhantomData<Bound<T>>);
+
+        impl<'de, T> Visitor<'de> for BoundVisitor<T>
+        where
+            T: Deserialize<'de>,
+        {
+            type Value = Bound<T>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("enum Bound")
+            }
+
+            fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+            where
+                A: EnumAccess<'de>,
+            {
+                match try!(data.variant()) {
+                    (Field::Unbounded, v) => v.unit_variant().map(|()| Bound::Unbounded),
+                    (Field::Included, v) => v.newtype_variant().map(Bound::Included),
+                    (Field::Excluded, v) => v.newtype_variant().map(Bound::Excluded),
+                }
+            }
+        }
+
+        const VARIANTS: &'static [&'static str] = &["Unbounded", "Included", "Excluded"];
+
+        deserializer.deserialize_enum("Bound", VARIANTS, BoundVisitor(PhantomData))
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+impl<'de, T, E> Deserialize<'de> for Result<T, E>
+where
+    T: Deserialize<'de>,
+    E: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        // If this were outside of the serde crate, it would just use:
+        //
+        //    #[derive(Deserialize)]
+        //    #[serde(variant_identifier)]
+        enum Field {
+            Ok,
+            Err,
+        }
+
+        impl<'de> Deserialize<'de> for Field {
+            #[inline]
+            fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+            where
+                D: Deserializer<'de>,
+            {
+                struct FieldVisitor;
+
+                impl<'de> Visitor<'de> for FieldVisitor {
+                    type Value = Field;
+
+                    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                        formatter.write_str("`Ok` or `Err`")
+                    }
+
+                    fn visit_u64<E>(self, value: u64) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            0 => Ok(Field::Ok),
+                            1 => Ok(Field::Err),
+                            _ => Err(Error::invalid_value(Unexpected::Unsigned(value), &self)),
+                        }
+                    }
+
+                    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            "Ok" => Ok(Field::Ok),
+                            "Err" => Ok(Field::Err),
+                            _ => Err(Error::unknown_variant(value, VARIANTS)),
+                        }
+                    }
+
+                    fn visit_bytes<E>(self, value: &[u8]) -> Result<Self::Value, E>
+                    where
+                        E: Error,
+                    {
+                        match value {
+                            b"Ok" => Ok(Field::Ok),
+                            b"Err" => Ok(Field::Err),
+                            _ => match str::from_utf8(value) {
+                                Ok(value) => Err(Error::unknown_variant(value, VARIANTS)),
+                                Err(_) => {
+                                    Err(Error::invalid_value(Unexpected::Bytes(value), &self))
+                                }
+                            },
+                        }
+                    }
+                }
+
+                deserializer.deserialize_identifier(FieldVisitor)
+            }
+        }
+
+        struct ResultVisitor<T, E>(PhantomData<Result<T, E>>);
+
+        impl<'de, T, E> Visitor<'de> for ResultVisitor<T, E>
+        where
+            T: Deserialize<'de>,
+            E: Deserialize<'de>,
+        {
+            type Value = Result<T, E>;
+
+            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+                formatter.write_str("enum Result")
+            }
+
+            fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
+            where
+                A: EnumAccess<'de>,
+            {
+                match try!(data.variant()) {
+                    (Field::Ok, v) => v.newtype_variant().map(Ok),
+                    (Field::Err, v) => v.newtype_variant().map(Err),
+                }
+            }
+        }
+
+        const VARIANTS: &'static [&'static str] = &["Ok", "Err"];
+
+        deserializer.deserialize_enum("Result", VARIANTS, ResultVisitor(PhantomData))
+    }
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+impl<'de, T> Deserialize<'de> for Wrapping<T>
+where
+    T: Deserialize<'de>,
+{
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        Deserialize::deserialize(deserializer).map(Wrapping)
+    }
+}
+
+#[cfg(all(feature = "std", not(no_std_atomic)))]
+macro_rules! atomic_impl {
+    ($($ty:ident $size:expr)*) => {
+        $(
+            #[cfg(any(no_target_has_atomic, target_has_atomic = $size))]
+            impl<'de> Deserialize<'de> for $ty {
+                fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+                where
+                    D: Deserializer<'de>,
+                {
+                    Deserialize::deserialize(deserializer).map(Self::new)
+                }
+            }
+        )*
+    };
+}
+
+#[cfg(all(feature = "std", not(no_std_atomic)))]
+atomic_impl! {
+    AtomicBool "8"
+    AtomicI8 "8"
+    AtomicI16 "16"
+    AtomicI32 "32"
+    AtomicIsize "ptr"
+    AtomicU8 "8"
+    AtomicU16 "16"
+    AtomicU32 "32"
+    AtomicUsize "ptr"
+}
+
+#[cfg(all(feature = "std", not(no_std_atomic64)))]
+atomic_impl! {
+    AtomicI64 "64"
+    AtomicU64 "64"
+}
+
+#[cfg(feature = "std")]
+struct FromStrVisitor<T> {
+    expecting: &'static str,
+    ty: PhantomData<T>,
+}
+
+#[cfg(feature = "std")]
+impl<T> FromStrVisitor<T> {
+    fn new(expecting: &'static str) -> Self {
+        FromStrVisitor {
+            expecting: expecting,
+            ty: PhantomData,
+        }
+    }
+}
+
+#[cfg(feature = "std")]
+impl<'de, T> Visitor<'de> for FromStrVisitor<T>
+where
+    T: str::FromStr,
+    T::Err: fmt::Display,
+{
+    type Value = T;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str(self.expecting)
+    }
+
+    fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
+    where
+        E: Error,
+    {
+        s.parse().map_err(Error::custom)
+    }
+}