Deleted vendor folder

1 files changed, 0 insertions, 2892 deletions

diff --git a/vendor/serde/src/private/de.rs b/vendor/serde/src/private/de.rs
deleted file mode 100644
index 883e690..0000000
--- a/vendor/serde/src/private/de.rs
+++ /dev/null
@@ -1,2892 +0,0 @@
-use crate::lib::*;
-
-use crate::de::value::{BorrowedBytesDeserializer, BytesDeserializer};
-use crate::de::{
-    Deserialize, DeserializeSeed, Deserializer, EnumAccess, Error, IntoDeserializer, VariantAccess,
-    Visitor,
-};
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-use crate::de::{MapAccess, Unexpected};
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-pub use self::content::{
-    Content, ContentDeserializer, ContentRefDeserializer, EnumDeserializer,
-    InternallyTaggedUnitVisitor, TagContentOtherField, TagContentOtherFieldVisitor,
-    TagOrContentField, TagOrContentFieldVisitor, TaggedContentVisitor, UntaggedUnitVisitor,
-};
-
-pub use crate::seed::InPlaceSeed;
-
-/// If the missing field is of type `Option<T>` then treat is as `None`,
-/// otherwise it is an error.
-pub fn missing_field<'de, V, E>(field: &'static str) -> Result<V, E>
-where
-    V: Deserialize<'de>,
-    E: Error,
-{
-    struct MissingFieldDeserializer<E>(&'static str, PhantomData<E>);
-
-    impl<'de, E> Deserializer<'de> for MissingFieldDeserializer<E>
-    where
-        E: Error,
-    {
-        type Error = E;
-
-        fn deserialize_any<V>(self, _visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            Err(Error::missing_field(self.0))
-        }
-
-        fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            visitor.visit_none()
-        }
-
-        forward_to_deserialize_any! {
-            bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
-            bytes byte_buf unit unit_struct newtype_struct seq tuple
-            tuple_struct map struct enum identifier ignored_any
-        }
-    }
-
-    let deserializer = MissingFieldDeserializer(field, PhantomData);
-    Deserialize::deserialize(deserializer)
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-pub fn borrow_cow_str<'de: 'a, 'a, D, R>(deserializer: D) -> Result<R, D::Error>
-where
-    D: Deserializer<'de>,
-    R: From<Cow<'a, str>>,
-{
-    struct CowStrVisitor;
-
-    impl<'a> Visitor<'a> for CowStrVisitor {
-        type Value = Cow<'a, str>;
-
-        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(Cow::Owned(v.to_owned()))
-        }
-
-        fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Borrowed(v))
-        }
-
-        fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Owned(v))
-        }
-
-        fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            match str::from_utf8(v) {
-                Ok(s) => Ok(Cow::Owned(s.to_owned())),
-                Err(_) => Err(Error::invalid_value(Unexpected::Bytes(v), &self)),
-            }
-        }
-
-        fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            match str::from_utf8(v) {
-                Ok(s) => Ok(Cow::Borrowed(s)),
-                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(Cow::Owned(s)),
-                Err(e) => Err(Error::invalid_value(
-                    Unexpected::Bytes(&e.into_bytes()),
-                    &self,
-                )),
-            }
-        }
-    }
-
-    deserializer.deserialize_str(CowStrVisitor).map(From::from)
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-pub fn borrow_cow_bytes<'de: 'a, 'a, D, R>(deserializer: D) -> Result<R, D::Error>
-where
-    D: Deserializer<'de>,
-    R: From<Cow<'a, [u8]>>,
-{
-    struct CowBytesVisitor;
-
-    impl<'a> Visitor<'a> for CowBytesVisitor {
-        type Value = Cow<'a, [u8]>;
-
-        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-            formatter.write_str("a byte array")
-        }
-
-        fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Owned(v.as_bytes().to_vec()))
-        }
-
-        fn visit_borrowed_str<E>(self, v: &'a str) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Borrowed(v.as_bytes()))
-        }
-
-        fn visit_string<E>(self, v: String) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Owned(v.into_bytes()))
-        }
-
-        fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Owned(v.to_vec()))
-        }
-
-        fn visit_borrowed_bytes<E>(self, v: &'a [u8]) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Borrowed(v))
-        }
-
-        fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>
-        where
-            E: Error,
-        {
-            Ok(Cow::Owned(v))
-        }
-    }
-
-    deserializer
-        .deserialize_bytes(CowBytesVisitor)
-        .map(From::from)
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-mod content {
-    // This module is private and nothing here should be used outside of
-    // generated code.
-    //
-    // We will iterate on the implementation for a few releases and only have to
-    // worry about backward compatibility for the `untagged` and `tag` attributes
-    // rather than for this entire mechanism.
-    //
-    // This issue is tracking making some of this stuff public:
-    // https://github.com/serde-rs/serde/issues/741
-
-    use crate::lib::*;
-
-    use crate::actually_private;
-    use crate::de::value::{MapDeserializer, SeqDeserializer};
-    use crate::de::{
-        self, size_hint, Deserialize, DeserializeSeed, Deserializer, EnumAccess, Expected,
-        IgnoredAny, MapAccess, SeqAccess, Unexpected, Visitor,
-    };
-
-    /// Used from generated code to buffer the contents of the Deserializer when
-    /// deserializing untagged enums and internally tagged enums.
-    ///
-    /// Not public API. Use serde-value instead.
-    #[derive(Debug, Clone)]
-    pub enum Content<'de> {
-        Bool(bool),
-
-        U8(u8),
-        U16(u16),
-        U32(u32),
-        U64(u64),
-
-        I8(i8),
-        I16(i16),
-        I32(i32),
-        I64(i64),
-
-        F32(f32),
-        F64(f64),
-
-        Char(char),
-        String(String),
-        Str(&'de str),
-        ByteBuf(Vec<u8>),
-        Bytes(&'de [u8]),
-
-        None,
-        Some(Box<Content<'de>>),
-
-        Unit,
-        Newtype(Box<Content<'de>>),
-        Seq(Vec<Content<'de>>),
-        Map(Vec<(Content<'de>, Content<'de>)>),
-    }
-
-    impl<'de> Content<'de> {
-        pub fn as_str(&self) -> Option<&str> {
-            match *self {
-                Content::Str(x) => Some(x),
-                Content::String(ref x) => Some(x),
-                Content::Bytes(x) => str::from_utf8(x).ok(),
-                Content::ByteBuf(ref x) => str::from_utf8(x).ok(),
-                _ => None,
-            }
-        }
-
-        #[cold]
-        fn unexpected(&self) -> Unexpected {
-            match *self {
-                Content::Bool(b) => Unexpected::Bool(b),
-                Content::U8(n) => Unexpected::Unsigned(n as u64),
-                Content::U16(n) => Unexpected::Unsigned(n as u64),
-                Content::U32(n) => Unexpected::Unsigned(n as u64),
-                Content::U64(n) => Unexpected::Unsigned(n),
-                Content::I8(n) => Unexpected::Signed(n as i64),
-                Content::I16(n) => Unexpected::Signed(n as i64),
-                Content::I32(n) => Unexpected::Signed(n as i64),
-                Content::I64(n) => Unexpected::Signed(n),
-                Content::F32(f) => Unexpected::Float(f as f64),
-                Content::F64(f) => Unexpected::Float(f),
-                Content::Char(c) => Unexpected::Char(c),
-                Content::String(ref s) => Unexpected::Str(s),
-                Content::Str(s) => Unexpected::Str(s),
-                Content::ByteBuf(ref b) => Unexpected::Bytes(b),
-                Content::Bytes(b) => Unexpected::Bytes(b),
-                Content::None | Content::Some(_) => Unexpected::Option,
-                Content::Unit => Unexpected::Unit,
-                Content::Newtype(_) => Unexpected::NewtypeStruct,
-                Content::Seq(_) => Unexpected::Seq,
-                Content::Map(_) => Unexpected::Map,
-            }
-        }
-    }
-
-    impl<'de> Deserialize<'de> for Content<'de> {
-        fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            // Untagged and internally tagged enums are only supported in
-            // self-describing formats.
-            let visitor = ContentVisitor { value: PhantomData };
-            deserializer.__deserialize_content(actually_private::T, visitor)
-        }
-    }
-
-    impl<'de, E> de::IntoDeserializer<'de, E> for Content<'de>
-    where
-        E: de::Error,
-    {
-        type Deserializer = ContentDeserializer<'de, E>;
-
-        fn into_deserializer(self) -> Self::Deserializer {
-            ContentDeserializer::new(self)
-        }
-    }
-
-    struct ContentVisitor<'de> {
-        value: PhantomData<Content<'de>>,
-    }
-
-    impl<'de> ContentVisitor<'de> {
-        fn new() -> Self {
-            ContentVisitor { value: PhantomData }
-        }
-    }
-
-    impl<'de> Visitor<'de> for ContentVisitor<'de> {
-        type Value = Content<'de>;
-
-        fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-            fmt.write_str("any value")
-        }
-
-        fn visit_bool<F>(self, value: bool) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::Bool(value))
-        }
-
-        fn visit_i8<F>(self, value: i8) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::I8(value))
-        }
-
-        fn visit_i16<F>(self, value: i16) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::I16(value))
-        }
-
-        fn visit_i32<F>(self, value: i32) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::I32(value))
-        }
-
-        fn visit_i64<F>(self, value: i64) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::I64(value))
-        }
-
-        fn visit_u8<F>(self, value: u8) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::U8(value))
-        }
-
-        fn visit_u16<F>(self, value: u16) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::U16(value))
-        }
-
-        fn visit_u32<F>(self, value: u32) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::U32(value))
-        }
-
-        fn visit_u64<F>(self, value: u64) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::U64(value))
-        }
-
-        fn visit_f32<F>(self, value: f32) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::F32(value))
-        }
-
-        fn visit_f64<F>(self, value: f64) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::F64(value))
-        }
-
-        fn visit_char<F>(self, value: char) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::Char(value))
-        }
-
-        fn visit_str<F>(self, value: &str) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::String(value.into()))
-        }
-
-        fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::Str(value))
-        }
-
-        fn visit_string<F>(self, value: String) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::String(value))
-        }
-
-        fn visit_bytes<F>(self, value: &[u8]) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::ByteBuf(value.into()))
-        }
-
-        fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::Bytes(value))
-        }
-
-        fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::ByteBuf(value))
-        }
-
-        fn visit_unit<F>(self) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::Unit)
-        }
-
-        fn visit_none<F>(self) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            Ok(Content::None)
-        }
-
-        fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            Deserialize::deserialize(deserializer).map(|v| Content::Some(Box::new(v)))
-        }
-
-        fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            Deserialize::deserialize(deserializer).map(|v| Content::Newtype(Box::new(v)))
-        }
-
-        fn visit_seq<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
-        where
-            V: SeqAccess<'de>,
-        {
-            let mut vec =
-                Vec::<Content>::with_capacity(size_hint::cautious::<Content>(visitor.size_hint()));
-            while let Some(e) = tri!(visitor.next_element()) {
-                vec.push(e);
-            }
-            Ok(Content::Seq(vec))
-        }
-
-        fn visit_map<V>(self, mut visitor: V) -> Result<Self::Value, V::Error>
-        where
-            V: MapAccess<'de>,
-        {
-            let mut vec =
-                Vec::<(Content, Content)>::with_capacity(
-                    size_hint::cautious::<(Content, Content)>(visitor.size_hint()),
-                );
-            while let Some(kv) = tri!(visitor.next_entry()) {
-                vec.push(kv);
-            }
-            Ok(Content::Map(vec))
-        }
-
-        fn visit_enum<V>(self, _visitor: V) -> Result<Self::Value, V::Error>
-        where
-            V: EnumAccess<'de>,
-        {
-            Err(de::Error::custom(
-                "untagged and internally tagged enums do not support enum input",
-            ))
-        }
-    }
-
-    /// This is the type of the map keys in an internally tagged enum.
-    ///
-    /// Not public API.
-    pub enum TagOrContent<'de> {
-        Tag,
-        Content(Content<'de>),
-    }
-
-    struct TagOrContentVisitor<'de> {
-        name: &'static str,
-        value: PhantomData<TagOrContent<'de>>,
-    }
-
-    impl<'de> TagOrContentVisitor<'de> {
-        fn new(name: &'static str) -> Self {
-            TagOrContentVisitor {
-                name,
-                value: PhantomData,
-            }
-        }
-    }
-
-    impl<'de> DeserializeSeed<'de> for TagOrContentVisitor<'de> {
-        type Value = TagOrContent<'de>;
-
-        fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            // Internally tagged enums are only supported in self-describing
-            // formats.
-            deserializer.deserialize_any(self)
-        }
-    }
-
-    impl<'de> Visitor<'de> for TagOrContentVisitor<'de> {
-        type Value = TagOrContent<'de>;
-
-        fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-            write!(fmt, "a type tag `{}` or any other value", self.name)
-        }
-
-        fn visit_bool<F>(self, value: bool) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_bool(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_i8<F>(self, value: i8) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_i8(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_i16<F>(self, value: i16) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_i16(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_i32<F>(self, value: i32) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_i32(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_i64<F>(self, value: i64) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_i64(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_u8<F>(self, value: u8) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_u8(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_u16<F>(self, value: u16) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_u16(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_u32<F>(self, value: u32) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_u32(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_u64<F>(self, value: u64) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_u64(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_f32<F>(self, value: f32) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_f32(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_f64<F>(self, value: f64) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_f64(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_char<F>(self, value: char) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_char(value)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_str<F>(self, value: &str) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            if value == self.name {
-                Ok(TagOrContent::Tag)
-            } else {
-                ContentVisitor::new()
-                    .visit_str(value)
-                    .map(TagOrContent::Content)
-            }
-        }
-
-        fn visit_borrowed_str<F>(self, value: &'de str) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            if value == self.name {
-                Ok(TagOrContent::Tag)
-            } else {
-                ContentVisitor::new()
-                    .visit_borrowed_str(value)
-                    .map(TagOrContent::Content)
-            }
-        }
-
-        fn visit_string<F>(self, value: String) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            if value == self.name {
-                Ok(TagOrContent::Tag)
-            } else {
-                ContentVisitor::new()
-                    .visit_string(value)
-                    .map(TagOrContent::Content)
-            }
-        }
-
-        fn visit_bytes<F>(self, value: &[u8]) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            if value == self.name.as_bytes() {
-                Ok(TagOrContent::Tag)
-            } else {
-                ContentVisitor::new()
-                    .visit_bytes(value)
-                    .map(TagOrContent::Content)
-            }
-        }
-
-        fn visit_borrowed_bytes<F>(self, value: &'de [u8]) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            if value == self.name.as_bytes() {
-                Ok(TagOrContent::Tag)
-            } else {
-                ContentVisitor::new()
-                    .visit_borrowed_bytes(value)
-                    .map(TagOrContent::Content)
-            }
-        }
-
-        fn visit_byte_buf<F>(self, value: Vec<u8>) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            if value == self.name.as_bytes() {
-                Ok(TagOrContent::Tag)
-            } else {
-                ContentVisitor::new()
-                    .visit_byte_buf(value)
-                    .map(TagOrContent::Content)
-            }
-        }
-
-        fn visit_unit<F>(self) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_unit()
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_none<F>(self) -> Result<Self::Value, F>
-        where
-            F: de::Error,
-        {
-            ContentVisitor::new()
-                .visit_none()
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_some<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            ContentVisitor::new()
-                .visit_some(deserializer)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_newtype_struct<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            ContentVisitor::new()
-                .visit_newtype_struct(deserializer)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_seq<V>(self, visitor: V) -> Result<Self::Value, V::Error>
-        where
-            V: SeqAccess<'de>,
-        {
-            ContentVisitor::new()
-                .visit_seq(visitor)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_map<V>(self, visitor: V) -> Result<Self::Value, V::Error>
-        where
-            V: MapAccess<'de>,
-        {
-            ContentVisitor::new()
-                .visit_map(visitor)
-                .map(TagOrContent::Content)
-        }
-
-        fn visit_enum<V>(self, visitor: V) -> Result<Self::Value, V::Error>
-        where
-            V: EnumAccess<'de>,
-        {
-            ContentVisitor::new()
-                .visit_enum(visitor)
-                .map(TagOrContent::Content)
-        }
-    }
-
-    /// Used by generated code to deserialize an internally tagged enum.
-    ///
-    /// Not public API.
-    pub struct TaggedContentVisitor<T> {
-        tag_name: &'static str,
-        expecting: &'static str,
-        value: PhantomData<T>,
-    }
-
-    impl<T> TaggedContentVisitor<T> {
-        /// Visitor for the content of an internally tagged enum with the given
-        /// tag name.
-        pub fn new(name: &'static str, expecting: &'static str) -> Self {
-            TaggedContentVisitor {
-                tag_name: name,
-                expecting,
-                value: PhantomData,
-            }
-        }
-    }
-
-    impl<'de, T> Visitor<'de> for TaggedContentVisitor<T>
-    where
-        T: Deserialize<'de>,
-    {
-        type Value = (T, Content<'de>);
-
-        fn expecting(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
-            fmt.write_str(self.expecting)
-        }
-
-        fn visit_seq<S>(self, mut seq: S) -> Result<Self::Value, S::Error>
-        where
-            S: SeqAccess<'de>,
-        {
-            let tag = match tri!(seq.next_element()) {
-                Some(tag) => tag,
-                None => {
-                    return Err(de::Error::missing_field(self.tag_name));
-                }
-            };
-            let rest = de::value::SeqAccessDeserializer::new(seq);
-            Ok((tag, tri!(Content::deserialize(rest))))
-        }
-
-        fn visit_map<M>(self, mut map: M) -> Result<Self::Value, M::Error>
-        where
-            M: MapAccess<'de>,
-        {
-            let mut tag = None;
-            let mut vec = Vec::<(Content, Content)>::with_capacity(size_hint::cautious::<(
-                Content,
-                Content,
-            )>(map.size_hint()));
-            while let Some(k) = tri!(map.next_key_seed(TagOrContentVisitor::new(self.tag_name))) {
-                match k {
-                    TagOrContent::Tag => {
-                        if tag.is_some() {
-                            return Err(de::Error::duplicate_field(self.tag_name));
-                        }
-                        tag = Some(tri!(map.next_value()));
-                    }
-                    TagOrContent::Content(k) => {
-                        let v = tri!(map.next_value());
-                        vec.push((k, v));
-                    }
-                }
-            }
-            match tag {
-                None => Err(de::Error::missing_field(self.tag_name)),
-                Some(tag) => Ok((tag, Content::Map(vec))),
-            }
-        }
-    }
-
-    /// Used by generated code to deserialize an adjacently tagged enum.
-    ///
-    /// Not public API.
-    pub enum TagOrContentField {
-        Tag,
-        Content,
-    }
-
-    /// Not public API.
-    pub struct TagOrContentFieldVisitor {
-        pub tag: &'static str,
-        pub content: &'static str,
-    }
-
-    impl<'de> DeserializeSeed<'de> for TagOrContentFieldVisitor {
-        type Value = TagOrContentField;
-
-        fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            deserializer.deserialize_identifier(self)
-        }
-    }
-
-    impl<'de> Visitor<'de> for TagOrContentFieldVisitor {
-        type Value = TagOrContentField;
-
-        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-            write!(formatter, "{:?} or {:?}", self.tag, self.content)
-        }
-
-        fn visit_u64<E>(self, field_index: u64) -> Result<Self::Value, E>
-        where
-            E: de::Error,
-        {
-            match field_index {
-                0 => Ok(TagOrContentField::Tag),
-                1 => Ok(TagOrContentField::Content),
-                _ => Err(de::Error::invalid_value(
-                    Unexpected::Unsigned(field_index),
-                    &self,
-                )),
-            }
-        }
-
-        fn visit_str<E>(self, field: &str) -> Result<Self::Value, E>
-        where
-            E: de::Error,
-        {
-            if field == self.tag {
-                Ok(TagOrContentField::Tag)
-            } else if field == self.content {
-                Ok(TagOrContentField::Content)
-            } else {
-                Err(de::Error::invalid_value(Unexpected::Str(field), &self))
-            }
-        }
-
-        fn visit_bytes<E>(self, field: &[u8]) -> Result<Self::Value, E>
-        where
-            E: de::Error,
-        {
-            if field == self.tag.as_bytes() {
-                Ok(TagOrContentField::Tag)
-            } else if field == self.content.as_bytes() {
-                Ok(TagOrContentField::Content)
-            } else {
-                Err(de::Error::invalid_value(Unexpected::Bytes(field), &self))
-            }
-        }
-    }
-
-    /// Used by generated code to deserialize an adjacently tagged enum when
-    /// ignoring unrelated fields is allowed.
-    ///
-    /// Not public API.
-    pub enum TagContentOtherField {
-        Tag,
-        Content,
-        Other,
-    }
-
-    /// Not public API.
-    pub struct TagContentOtherFieldVisitor {
-        pub tag: &'static str,
-        pub content: &'static str,
-    }
-
-    impl<'de> DeserializeSeed<'de> for TagContentOtherFieldVisitor {
-        type Value = TagContentOtherField;
-
-        fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-        where
-            D: Deserializer<'de>,
-        {
-            deserializer.deserialize_identifier(self)
-        }
-    }
-
-    impl<'de> Visitor<'de> for TagContentOtherFieldVisitor {
-        type Value = TagContentOtherField;
-
-        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-            write!(
-                formatter,
-                "{:?}, {:?}, or other ignored fields",
-                self.tag, self.content
-            )
-        }
-
-        fn visit_u64<E>(self, field_index: u64) -> Result<Self::Value, E>
-        where
-            E: de::Error,
-        {
-            match field_index {
-                0 => Ok(TagContentOtherField::Tag),
-                1 => Ok(TagContentOtherField::Content),
-                _ => Ok(TagContentOtherField::Other),
-            }
-        }
-
-        fn visit_str<E>(self, field: &str) -> Result<Self::Value, E>
-        where
-            E: de::Error,
-        {
-            self.visit_bytes(field.as_bytes())
-        }
-
-        fn visit_bytes<E>(self, field: &[u8]) -> Result<Self::Value, E>
-        where
-            E: de::Error,
-        {
-            if field == self.tag.as_bytes() {
-                Ok(TagContentOtherField::Tag)
-            } else if field == self.content.as_bytes() {
-                Ok(TagContentOtherField::Content)
-            } else {
-                Ok(TagContentOtherField::Other)
-            }
-        }
-    }
-
-    /// Not public API
-    pub struct ContentDeserializer<'de, E> {
-        content: Content<'de>,
-        err: PhantomData<E>,
-    }
-
-    impl<'de, E> ContentDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        #[cold]
-        fn invalid_type(self, exp: &Expected) -> E {
-            de::Error::invalid_type(self.content.unexpected(), exp)
-        }
-
-        fn deserialize_integer<V>(self, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U16(v) => visitor.visit_u16(v),
-                Content::U32(v) => visitor.visit_u32(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                Content::I8(v) => visitor.visit_i8(v),
-                Content::I16(v) => visitor.visit_i16(v),
-                Content::I32(v) => visitor.visit_i32(v),
-                Content::I64(v) => visitor.visit_i64(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_float<V>(self, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::F32(v) => visitor.visit_f32(v),
-                Content::F64(v) => visitor.visit_f64(v),
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U16(v) => visitor.visit_u16(v),
-                Content::U32(v) => visitor.visit_u32(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                Content::I8(v) => visitor.visit_i8(v),
-                Content::I16(v) => visitor.visit_i16(v),
-                Content::I32(v) => visitor.visit_i32(v),
-                Content::I64(v) => visitor.visit_i64(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-    }
-
-    fn visit_content_seq<'de, V, E>(content: Vec<Content<'de>>, visitor: V) -> Result<V::Value, E>
-    where
-        V: Visitor<'de>,
-        E: de::Error,
-    {
-        let seq = content.into_iter().map(ContentDeserializer::new);
-        let mut seq_visitor = SeqDeserializer::new(seq);
-        let value = tri!(visitor.visit_seq(&mut seq_visitor));
-        tri!(seq_visitor.end());
-        Ok(value)
-    }
-
-    fn visit_content_map<'de, V, E>(
-        content: Vec<(Content<'de>, Content<'de>)>,
-        visitor: V,
-    ) -> Result<V::Value, E>
-    where
-        V: Visitor<'de>,
-        E: de::Error,
-    {
-        let map = content
-            .into_iter()
-            .map(|(k, v)| (ContentDeserializer::new(k), ContentDeserializer::new(v)));
-        let mut map_visitor = MapDeserializer::new(map);
-        let value = tri!(visitor.visit_map(&mut map_visitor));
-        tri!(map_visitor.end());
-        Ok(value)
-    }
-
-    /// Used when deserializing an internally tagged enum because the content
-    /// will be used exactly once.
-    impl<'de, E> Deserializer<'de> for ContentDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Bool(v) => visitor.visit_bool(v),
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U16(v) => visitor.visit_u16(v),
-                Content::U32(v) => visitor.visit_u32(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                Content::I8(v) => visitor.visit_i8(v),
-                Content::I16(v) => visitor.visit_i16(v),
-                Content::I32(v) => visitor.visit_i32(v),
-                Content::I64(v) => visitor.visit_i64(v),
-                Content::F32(v) => visitor.visit_f32(v),
-                Content::F64(v) => visitor.visit_f64(v),
-                Content::Char(v) => visitor.visit_char(v),
-                Content::String(v) => visitor.visit_string(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(v) => visitor.visit_byte_buf(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                Content::Unit => visitor.visit_unit(),
-                Content::None => visitor.visit_none(),
-                Content::Some(v) => visitor.visit_some(ContentDeserializer::new(*v)),
-                Content::Newtype(v) => visitor.visit_newtype_struct(ContentDeserializer::new(*v)),
-                Content::Seq(v) => visit_content_seq(v, visitor),
-                Content::Map(v) => visit_content_map(v, visitor),
-            }
-        }
-
-        fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Bool(v) => visitor.visit_bool(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_float(visitor)
-        }
-
-        fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_float(visitor)
-        }
-
-        fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Char(v) => visitor.visit_char(v),
-                Content::String(v) => visitor.visit_string(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_string(visitor)
-        }
-
-        fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::String(v) => visitor.visit_string(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(v) => visitor.visit_byte_buf(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_byte_buf(visitor)
-        }
-
-        fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::String(v) => visitor.visit_string(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(v) => visitor.visit_byte_buf(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                Content::Seq(v) => visit_content_seq(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::None => visitor.visit_none(),
-                Content::Some(v) => visitor.visit_some(ContentDeserializer::new(*v)),
-                Content::Unit => visitor.visit_unit(),
-                _ => visitor.visit_some(self),
-            }
-        }
-
-        fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Unit => visitor.visit_unit(),
-
-                // Allow deserializing newtype variant containing unit.
-                //
-                //     #[derive(Deserialize)]
-                //     #[serde(tag = "result")]
-                //     enum Response<T> {
-                //         Success(T),
-                //     }
-                //
-                // We want {"result":"Success"} to deserialize into Response<()>.
-                Content::Map(ref v) if v.is_empty() => visitor.visit_unit(),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_unit_struct<V>(
-            self,
-            _name: &'static str,
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                // As a special case, allow deserializing untagged newtype
-                // variant containing unit struct.
-                //
-                //     #[derive(Deserialize)]
-                //     struct Info;
-                //
-                //     #[derive(Deserialize)]
-                //     #[serde(tag = "topic")]
-                //     enum Message {
-                //         Info(Info),
-                //     }
-                //
-                // We want {"topic":"Info"} to deserialize even though
-                // ordinarily unit structs do not deserialize from empty map/seq.
-                Content::Map(ref v) if v.is_empty() => visitor.visit_unit(),
-                Content::Seq(ref v) if v.is_empty() => visitor.visit_unit(),
-                _ => self.deserialize_any(visitor),
-            }
-        }
-
-        fn deserialize_newtype_struct<V>(
-            self,
-            _name: &str,
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Newtype(v) => visitor.visit_newtype_struct(ContentDeserializer::new(*v)),
-                _ => visitor.visit_newtype_struct(self),
-            }
-        }
-
-        fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Seq(v) => visit_content_seq(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_seq(visitor)
-        }
-
-        fn deserialize_tuple_struct<V>(
-            self,
-            _name: &'static str,
-            _len: usize,
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_seq(visitor)
-        }
-
-        fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Map(v) => visit_content_map(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_struct<V>(
-            self,
-            _name: &'static str,
-            _fields: &'static [&'static str],
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::Seq(v) => visit_content_seq(v, visitor),
-                Content::Map(v) => visit_content_map(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_enum<V>(
-            self,
-            _name: &str,
-            _variants: &'static [&'static str],
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            let (variant, value) = match self.content {
-                Content::Map(value) => {
-                    let mut iter = value.into_iter();
-                    let (variant, value) = match iter.next() {
-                        Some(v) => v,
-                        None => {
-                            return Err(de::Error::invalid_value(
-                                de::Unexpected::Map,
-                                &"map with a single key",
-                            ));
-                        }
-                    };
-                    // enums are encoded in json as maps with a single key:value pair
-                    if iter.next().is_some() {
-                        return Err(de::Error::invalid_value(
-                            de::Unexpected::Map,
-                            &"map with a single key",
-                        ));
-                    }
-                    (variant, Some(value))
-                }
-                s @ Content::String(_) | s @ Content::Str(_) => (s, None),
-                other => {
-                    return Err(de::Error::invalid_type(
-                        other.unexpected(),
-                        &"string or map",
-                    ));
-                }
-            };
-
-            visitor.visit_enum(EnumDeserializer::new(variant, value))
-        }
-
-        fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match self.content {
-                Content::String(v) => visitor.visit_string(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(v) => visitor.visit_byte_buf(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            drop(self);
-            visitor.visit_unit()
-        }
-
-        fn __deserialize_content<V>(
-            self,
-            _: actually_private::T,
-            visitor: V,
-        ) -> Result<Content<'de>, Self::Error>
-        where
-            V: Visitor<'de, Value = Content<'de>>,
-        {
-            let _ = visitor;
-            Ok(self.content)
-        }
-    }
-
-    impl<'de, E> ContentDeserializer<'de, E> {
-        /// private API, don't use
-        pub fn new(content: Content<'de>) -> Self {
-            ContentDeserializer {
-                content,
-                err: PhantomData,
-            }
-        }
-    }
-
-    pub struct EnumDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        variant: Content<'de>,
-        value: Option<Content<'de>>,
-        err: PhantomData<E>,
-    }
-
-    impl<'de, E> EnumDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        pub fn new(variant: Content<'de>, value: Option<Content<'de>>) -> EnumDeserializer<'de, E> {
-            EnumDeserializer {
-                variant,
-                value,
-                err: PhantomData,
-            }
-        }
-    }
-
-    impl<'de, E> de::EnumAccess<'de> for EnumDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-        type Variant = VariantDeserializer<'de, Self::Error>;
-
-        fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), E>
-        where
-            V: de::DeserializeSeed<'de>,
-        {
-            let visitor = VariantDeserializer {
-                value: self.value,
-                err: PhantomData,
-            };
-            seed.deserialize(ContentDeserializer::new(self.variant))
-                .map(|v| (v, visitor))
-        }
-    }
-
-    pub struct VariantDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        value: Option<Content<'de>>,
-        err: PhantomData<E>,
-    }
-
-    impl<'de, E> de::VariantAccess<'de> for VariantDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        fn unit_variant(self) -> Result<(), E> {
-            match self.value {
-                Some(value) => de::Deserialize::deserialize(ContentDeserializer::new(value)),
-                None => Ok(()),
-            }
-        }
-
-        fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, E>
-        where
-            T: de::DeserializeSeed<'de>,
-        {
-            match self.value {
-                Some(value) => seed.deserialize(ContentDeserializer::new(value)),
-                None => Err(de::Error::invalid_type(
-                    de::Unexpected::UnitVariant,
-                    &"newtype variant",
-                )),
-            }
-        }
-
-        fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: de::Visitor<'de>,
-        {
-            match self.value {
-                Some(Content::Seq(v)) => {
-                    de::Deserializer::deserialize_any(SeqDeserializer::new(v.into_iter()), visitor)
-                }
-                Some(other) => Err(de::Error::invalid_type(
-                    other.unexpected(),
-                    &"tuple variant",
-                )),
-                None => Err(de::Error::invalid_type(
-                    de::Unexpected::UnitVariant,
-                    &"tuple variant",
-                )),
-            }
-        }
-
-        fn struct_variant<V>(
-            self,
-            _fields: &'static [&'static str],
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: de::Visitor<'de>,
-        {
-            match self.value {
-                Some(Content::Map(v)) => {
-                    de::Deserializer::deserialize_any(MapDeserializer::new(v.into_iter()), visitor)
-                }
-                Some(Content::Seq(v)) => {
-                    de::Deserializer::deserialize_any(SeqDeserializer::new(v.into_iter()), visitor)
-                }
-                Some(other) => Err(de::Error::invalid_type(
-                    other.unexpected(),
-                    &"struct variant",
-                )),
-                None => Err(de::Error::invalid_type(
-                    de::Unexpected::UnitVariant,
-                    &"struct variant",
-                )),
-            }
-        }
-    }
-
-    /// Not public API.
-    pub struct ContentRefDeserializer<'a, 'de: 'a, E> {
-        content: &'a Content<'de>,
-        err: PhantomData<E>,
-    }
-
-    impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        #[cold]
-        fn invalid_type(self, exp: &Expected) -> E {
-            de::Error::invalid_type(self.content.unexpected(), exp)
-        }
-
-        fn deserialize_integer<V>(self, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U16(v) => visitor.visit_u16(v),
-                Content::U32(v) => visitor.visit_u32(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                Content::I8(v) => visitor.visit_i8(v),
-                Content::I16(v) => visitor.visit_i16(v),
-                Content::I32(v) => visitor.visit_i32(v),
-                Content::I64(v) => visitor.visit_i64(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_float<V>(self, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::F32(v) => visitor.visit_f32(v),
-                Content::F64(v) => visitor.visit_f64(v),
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U16(v) => visitor.visit_u16(v),
-                Content::U32(v) => visitor.visit_u32(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                Content::I8(v) => visitor.visit_i8(v),
-                Content::I16(v) => visitor.visit_i16(v),
-                Content::I32(v) => visitor.visit_i32(v),
-                Content::I64(v) => visitor.visit_i64(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-    }
-
-    fn visit_content_seq_ref<'a, 'de, V, E>(
-        content: &'a [Content<'de>],
-        visitor: V,
-    ) -> Result<V::Value, E>
-    where
-        V: Visitor<'de>,
-        E: de::Error,
-    {
-        let seq = content.iter().map(ContentRefDeserializer::new);
-        let mut seq_visitor = SeqDeserializer::new(seq);
-        let value = tri!(visitor.visit_seq(&mut seq_visitor));
-        tri!(seq_visitor.end());
-        Ok(value)
-    }
-
-    fn visit_content_map_ref<'a, 'de, V, E>(
-        content: &'a [(Content<'de>, Content<'de>)],
-        visitor: V,
-    ) -> Result<V::Value, E>
-    where
-        V: Visitor<'de>,
-        E: de::Error,
-    {
-        let map = content.iter().map(|(k, v)| {
-            (
-                ContentRefDeserializer::new(k),
-                ContentRefDeserializer::new(v),
-            )
-        });
-        let mut map_visitor = MapDeserializer::new(map);
-        let value = tri!(visitor.visit_map(&mut map_visitor));
-        tri!(map_visitor.end());
-        Ok(value)
-    }
-
-    /// Used when deserializing an untagged enum because the content may need
-    /// to be used more than once.
-    impl<'de, 'a, E> Deserializer<'de> for ContentRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Bool(v) => visitor.visit_bool(v),
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U16(v) => visitor.visit_u16(v),
-                Content::U32(v) => visitor.visit_u32(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                Content::I8(v) => visitor.visit_i8(v),
-                Content::I16(v) => visitor.visit_i16(v),
-                Content::I32(v) => visitor.visit_i32(v),
-                Content::I64(v) => visitor.visit_i64(v),
-                Content::F32(v) => visitor.visit_f32(v),
-                Content::F64(v) => visitor.visit_f64(v),
-                Content::Char(v) => visitor.visit_char(v),
-                Content::String(ref v) => visitor.visit_str(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(ref v) => visitor.visit_bytes(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                Content::Unit => visitor.visit_unit(),
-                Content::None => visitor.visit_none(),
-                Content::Some(ref v) => visitor.visit_some(ContentRefDeserializer::new(v)),
-                Content::Newtype(ref v) => {
-                    visitor.visit_newtype_struct(ContentRefDeserializer::new(v))
-                }
-                Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
-                Content::Map(ref v) => visit_content_map_ref(v, visitor),
-            }
-        }
-
-        fn deserialize_bool<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Bool(v) => visitor.visit_bool(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_i8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_i16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_i32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_i64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u8<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u16<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_u64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_integer(visitor)
-        }
-
-        fn deserialize_f32<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_float(visitor)
-        }
-
-        fn deserialize_f64<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_float(visitor)
-        }
-
-        fn deserialize_char<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Char(v) => visitor.visit_char(v),
-                Content::String(ref v) => visitor.visit_str(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::String(ref v) => visitor.visit_str(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(ref v) => visitor.visit_bytes(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_string<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_str(visitor)
-        }
-
-        fn deserialize_bytes<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::String(ref v) => visitor.visit_str(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(ref v) => visitor.visit_bytes(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_byte_buf<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_bytes(visitor)
-        }
-
-        fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::None => visitor.visit_none(),
-                Content::Some(ref v) => visitor.visit_some(ContentRefDeserializer::new(v)),
-                Content::Unit => visitor.visit_unit(),
-                _ => visitor.visit_some(self),
-            }
-        }
-
-        fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Unit => visitor.visit_unit(),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_unit_struct<V>(
-            self,
-            _name: &'static str,
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_unit(visitor)
-        }
-
-        fn deserialize_newtype_struct<V>(self, _name: &str, visitor: V) -> Result<V::Value, E>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Newtype(ref v) => {
-                    visitor.visit_newtype_struct(ContentRefDeserializer::new(v))
-                }
-                _ => visitor.visit_newtype_struct(self),
-            }
-        }
-
-        fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_tuple<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_seq(visitor)
-        }
-
-        fn deserialize_tuple_struct<V>(
-            self,
-            _name: &'static str,
-            _len: usize,
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            self.deserialize_seq(visitor)
-        }
-
-        fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Map(ref v) => visit_content_map_ref(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_struct<V>(
-            self,
-            _name: &'static str,
-            _fields: &'static [&'static str],
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::Seq(ref v) => visit_content_seq_ref(v, visitor),
-                Content::Map(ref v) => visit_content_map_ref(v, visitor),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_enum<V>(
-            self,
-            _name: &str,
-            _variants: &'static [&'static str],
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            let (variant, value) = match *self.content {
-                Content::Map(ref value) => {
-                    let mut iter = value.iter();
-                    let (variant, value) = match iter.next() {
-                        Some(v) => v,
-                        None => {
-                            return Err(de::Error::invalid_value(
-                                de::Unexpected::Map,
-                                &"map with a single key",
-                            ));
-                        }
-                    };
-                    // enums are encoded in json as maps with a single key:value pair
-                    if iter.next().is_some() {
-                        return Err(de::Error::invalid_value(
-                            de::Unexpected::Map,
-                            &"map with a single key",
-                        ));
-                    }
-                    (variant, Some(value))
-                }
-                ref s @ Content::String(_) | ref s @ Content::Str(_) => (s, None),
-                ref other => {
-                    return Err(de::Error::invalid_type(
-                        other.unexpected(),
-                        &"string or map",
-                    ));
-                }
-            };
-
-            visitor.visit_enum(EnumRefDeserializer {
-                variant,
-                value,
-                err: PhantomData,
-            })
-        }
-
-        fn deserialize_identifier<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            match *self.content {
-                Content::String(ref v) => visitor.visit_str(v),
-                Content::Str(v) => visitor.visit_borrowed_str(v),
-                Content::ByteBuf(ref v) => visitor.visit_bytes(v),
-                Content::Bytes(v) => visitor.visit_borrowed_bytes(v),
-                Content::U8(v) => visitor.visit_u8(v),
-                Content::U64(v) => visitor.visit_u64(v),
-                _ => Err(self.invalid_type(&visitor)),
-            }
-        }
-
-        fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: Visitor<'de>,
-        {
-            visitor.visit_unit()
-        }
-
-        fn __deserialize_content<V>(
-            self,
-            _: actually_private::T,
-            visitor: V,
-        ) -> Result<Content<'de>, Self::Error>
-        where
-            V: Visitor<'de, Value = Content<'de>>,
-        {
-            let _ = visitor;
-            Ok(self.content.clone())
-        }
-    }
-
-    impl<'a, 'de, E> ContentRefDeserializer<'a, 'de, E> {
-        /// private API, don't use
-        pub fn new(content: &'a Content<'de>) -> Self {
-            ContentRefDeserializer {
-                content,
-                err: PhantomData,
-            }
-        }
-    }
-
-    impl<'a, 'de: 'a, E> Copy for ContentRefDeserializer<'a, 'de, E> {}
-
-    impl<'a, 'de: 'a, E> Clone for ContentRefDeserializer<'a, 'de, E> {
-        fn clone(&self) -> Self {
-            *self
-        }
-    }
-
-    struct EnumRefDeserializer<'a, 'de: 'a, E>
-    where
-        E: de::Error,
-    {
-        variant: &'a Content<'de>,
-        value: Option<&'a Content<'de>>,
-        err: PhantomData<E>,
-    }
-
-    impl<'de, 'a, E> de::EnumAccess<'de> for EnumRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-        type Variant = VariantRefDeserializer<'a, 'de, Self::Error>;
-
-        fn variant_seed<V>(self, seed: V) -> Result<(V::Value, Self::Variant), Self::Error>
-        where
-            V: de::DeserializeSeed<'de>,
-        {
-            let visitor = VariantRefDeserializer {
-                value: self.value,
-                err: PhantomData,
-            };
-            seed.deserialize(ContentRefDeserializer::new(self.variant))
-                .map(|v| (v, visitor))
-        }
-    }
-
-    struct VariantRefDeserializer<'a, 'de: 'a, E>
-    where
-        E: de::Error,
-    {
-        value: Option<&'a Content<'de>>,
-        err: PhantomData<E>,
-    }
-
-    impl<'de, 'a, E> de::VariantAccess<'de> for VariantRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        fn unit_variant(self) -> Result<(), E> {
-            match self.value {
-                Some(value) => de::Deserialize::deserialize(ContentRefDeserializer::new(value)),
-                None => Ok(()),
-            }
-        }
-
-        fn newtype_variant_seed<T>(self, seed: T) -> Result<T::Value, E>
-        where
-            T: de::DeserializeSeed<'de>,
-        {
-            match self.value {
-                Some(value) => seed.deserialize(ContentRefDeserializer::new(value)),
-                None => Err(de::Error::invalid_type(
-                    de::Unexpected::UnitVariant,
-                    &"newtype variant",
-                )),
-            }
-        }
-
-        fn tuple_variant<V>(self, _len: usize, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: de::Visitor<'de>,
-        {
-            match self.value {
-                Some(Content::Seq(v)) => {
-                    de::Deserializer::deserialize_any(SeqRefDeserializer::new(v), visitor)
-                }
-                Some(other) => Err(de::Error::invalid_type(
-                    other.unexpected(),
-                    &"tuple variant",
-                )),
-                None => Err(de::Error::invalid_type(
-                    de::Unexpected::UnitVariant,
-                    &"tuple variant",
-                )),
-            }
-        }
-
-        fn struct_variant<V>(
-            self,
-            _fields: &'static [&'static str],
-            visitor: V,
-        ) -> Result<V::Value, Self::Error>
-        where
-            V: de::Visitor<'de>,
-        {
-            match self.value {
-                Some(Content::Map(v)) => {
-                    de::Deserializer::deserialize_any(MapRefDeserializer::new(v), visitor)
-                }
-                Some(Content::Seq(v)) => {
-                    de::Deserializer::deserialize_any(SeqRefDeserializer::new(v), visitor)
-                }
-                Some(other) => Err(de::Error::invalid_type(
-                    other.unexpected(),
-                    &"struct variant",
-                )),
-                None => Err(de::Error::invalid_type(
-                    de::Unexpected::UnitVariant,
-                    &"struct variant",
-                )),
-            }
-        }
-    }
-
-    struct SeqRefDeserializer<'a, 'de: 'a, E>
-    where
-        E: de::Error,
-    {
-        iter: <&'a [Content<'de>] as IntoIterator>::IntoIter,
-        err: PhantomData<E>,
-    }
-
-    impl<'a, 'de, E> SeqRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        fn new(slice: &'a [Content<'de>]) -> Self {
-            SeqRefDeserializer {
-                iter: slice.iter(),
-                err: PhantomData,
-            }
-        }
-    }
-
-    impl<'de, 'a, E> de::Deserializer<'de> for SeqRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        #[inline]
-        fn deserialize_any<V>(mut self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: de::Visitor<'de>,
-        {
-            let len = self.iter.len();
-            if len == 0 {
-                visitor.visit_unit()
-            } else {
-                let ret = tri!(visitor.visit_seq(&mut self));
-                let remaining = self.iter.len();
-                if remaining == 0 {
-                    Ok(ret)
-                } else {
-                    Err(de::Error::invalid_length(len, &"fewer elements in array"))
-                }
-            }
-        }
-
-        forward_to_deserialize_any! {
-            bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
-            bytes byte_buf option unit unit_struct newtype_struct seq tuple
-            tuple_struct map struct enum identifier ignored_any
-        }
-    }
-
-    impl<'de, 'a, E> de::SeqAccess<'de> for SeqRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        fn next_element_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
-        where
-            T: de::DeserializeSeed<'de>,
-        {
-            match self.iter.next() {
-                Some(value) => seed
-                    .deserialize(ContentRefDeserializer::new(value))
-                    .map(Some),
-                None => Ok(None),
-            }
-        }
-
-        fn size_hint(&self) -> Option<usize> {
-            size_hint::from_bounds(&self.iter)
-        }
-    }
-
-    struct MapRefDeserializer<'a, 'de: 'a, E>
-    where
-        E: de::Error,
-    {
-        iter: <&'a [(Content<'de>, Content<'de>)] as IntoIterator>::IntoIter,
-        value: Option<&'a Content<'de>>,
-        err: PhantomData<E>,
-    }
-
-    impl<'a, 'de, E> MapRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        fn new(map: &'a [(Content<'de>, Content<'de>)]) -> Self {
-            MapRefDeserializer {
-                iter: map.iter(),
-                value: None,
-                err: PhantomData,
-            }
-        }
-    }
-
-    impl<'de, 'a, E> de::MapAccess<'de> for MapRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
-        where
-            T: de::DeserializeSeed<'de>,
-        {
-            match self.iter.next() {
-                Some((key, value)) => {
-                    self.value = Some(value);
-                    seed.deserialize(ContentRefDeserializer::new(key)).map(Some)
-                }
-                None => Ok(None),
-            }
-        }
-
-        fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
-        where
-            T: de::DeserializeSeed<'de>,
-        {
-            match self.value.take() {
-                Some(value) => seed.deserialize(ContentRefDeserializer::new(value)),
-                None => Err(de::Error::custom("value is missing")),
-            }
-        }
-
-        fn size_hint(&self) -> Option<usize> {
-            size_hint::from_bounds(&self.iter)
-        }
-    }
-
-    impl<'de, 'a, E> de::Deserializer<'de> for MapRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Error = E;
-
-        #[inline]
-        fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-        where
-            V: de::Visitor<'de>,
-        {
-            visitor.visit_map(self)
-        }
-
-        forward_to_deserialize_any! {
-            bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
-            bytes byte_buf option unit unit_struct newtype_struct seq tuple
-            tuple_struct map struct enum identifier ignored_any
-        }
-    }
-
-    impl<'de, E> de::IntoDeserializer<'de, E> for ContentDeserializer<'de, E>
-    where
-        E: de::Error,
-    {
-        type Deserializer = Self;
-
-        fn into_deserializer(self) -> Self {
-            self
-        }
-    }
-
-    impl<'de, 'a, E> de::IntoDeserializer<'de, E> for ContentRefDeserializer<'a, 'de, E>
-    where
-        E: de::Error,
-    {
-        type Deserializer = Self;
-
-        fn into_deserializer(self) -> Self {
-            self
-        }
-    }
-
-    /// Visitor for deserializing an internally tagged unit variant.
-    ///
-    /// Not public API.
-    pub struct InternallyTaggedUnitVisitor<'a> {
-        type_name: &'a str,
-        variant_name: &'a str,
-    }
-
-    impl<'a> InternallyTaggedUnitVisitor<'a> {
-        /// Not public API.
-        pub fn new(type_name: &'a str, variant_name: &'a str) -> Self {
-            InternallyTaggedUnitVisitor {
-                type_name,
-                variant_name,
-            }
-        }
-    }
-
-    impl<'de, 'a> Visitor<'de> for InternallyTaggedUnitVisitor<'a> {
-        type Value = ();
-
-        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-            write!(
-                formatter,
-                "unit variant {}::{}",
-                self.type_name, self.variant_name
-            )
-        }
-
-        fn visit_seq<S>(self, _: S) -> Result<(), S::Error>
-        where
-            S: SeqAccess<'de>,
-        {
-            Ok(())
-        }
-
-        fn visit_map<M>(self, mut access: M) -> Result<(), M::Error>
-        where
-            M: MapAccess<'de>,
-        {
-            while tri!(access.next_entry::<IgnoredAny, IgnoredAny>()).is_some() {}
-            Ok(())
-        }
-    }
-
-    /// Visitor for deserializing an untagged unit variant.
-    ///
-    /// Not public API.
-    pub struct UntaggedUnitVisitor<'a> {
-        type_name: &'a str,
-        variant_name: &'a str,
-    }
-
-    impl<'a> UntaggedUnitVisitor<'a> {
-        /// Not public API.
-        pub fn new(type_name: &'a str, variant_name: &'a str) -> Self {
-            UntaggedUnitVisitor {
-                type_name,
-                variant_name,
-            }
-        }
-    }
-
-    impl<'de, 'a> Visitor<'de> for UntaggedUnitVisitor<'a> {
-        type Value = ();
-
-        fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-            write!(
-                formatter,
-                "unit variant {}::{}",
-                self.type_name, self.variant_name
-            )
-        }
-
-        fn visit_unit<E>(self) -> Result<(), E>
-        where
-            E: de::Error,
-        {
-            Ok(())
-        }
-
-        fn visit_none<E>(self) -> Result<(), E>
-        where
-            E: de::Error,
-        {
-            Ok(())
-        }
-    }
-}
-
-////////////////////////////////////////////////////////////////////////////////
-
-// Like `IntoDeserializer` but also implemented for `&[u8]`. This is used for
-// the newtype fallthrough case of `field_identifier`.
-//
-//    #[derive(Deserialize)]
-//    #[serde(field_identifier)]
-//    enum F {
-//        A,
-//        B,
-//        Other(String), // deserialized using IdentifierDeserializer
-//    }
-pub trait IdentifierDeserializer<'de, E: Error> {
-    type Deserializer: Deserializer<'de, Error = E>;
-
-    fn from(self) -> Self::Deserializer;
-}
-
-pub struct Borrowed<'de, T: 'de + ?Sized>(pub &'de T);
-
-impl<'de, E> IdentifierDeserializer<'de, E> for u64
-where
-    E: Error,
-{
-    type Deserializer = <u64 as IntoDeserializer<'de, E>>::Deserializer;
-
-    fn from(self) -> Self::Deserializer {
-        self.into_deserializer()
-    }
-}
-
-pub struct StrDeserializer<'a, E> {
-    value: &'a str,
-    marker: PhantomData<E>,
-}
-
-impl<'de, 'a, E> Deserializer<'de> for StrDeserializer<'a, E>
-where
-    E: Error,
-{
-    type Error = E;
-
-    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        visitor.visit_str(self.value)
-    }
-
-    forward_to_deserialize_any! {
-        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
-        bytes byte_buf option unit unit_struct newtype_struct seq tuple
-        tuple_struct map struct enum identifier ignored_any
-    }
-}
-
-pub struct BorrowedStrDeserializer<'de, E> {
-    value: &'de str,
-    marker: PhantomData<E>,
-}
-
-impl<'de, E> Deserializer<'de> for BorrowedStrDeserializer<'de, E>
-where
-    E: Error,
-{
-    type Error = E;
-
-    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        visitor.visit_borrowed_str(self.value)
-    }
-
-    forward_to_deserialize_any! {
-        bool i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 char str string
-        bytes byte_buf option unit unit_struct newtype_struct seq tuple
-        tuple_struct map struct enum identifier ignored_any
-    }
-}
-
-impl<'a, E> IdentifierDeserializer<'a, E> for &'a str
-where
-    E: Error,
-{
-    type Deserializer = StrDeserializer<'a, E>;
-
-    fn from(self) -> Self::Deserializer {
-        StrDeserializer {
-            value: self,
-            marker: PhantomData,
-        }
-    }
-}
-
-impl<'de, E> IdentifierDeserializer<'de, E> for Borrowed<'de, str>
-where
-    E: Error,
-{
-    type Deserializer = BorrowedStrDeserializer<'de, E>;
-
-    fn from(self) -> Self::Deserializer {
-        BorrowedStrDeserializer {
-            value: self.0,
-            marker: PhantomData,
-        }
-    }
-}
-
-impl<'a, E> IdentifierDeserializer<'a, E> for &'a [u8]
-where
-    E: Error,
-{
-    type Deserializer = BytesDeserializer<'a, E>;
-
-    fn from(self) -> Self::Deserializer {
-        BytesDeserializer::new(self)
-    }
-}
-
-impl<'de, E> IdentifierDeserializer<'de, E> for Borrowed<'de, [u8]>
-where
-    E: Error,
-{
-    type Deserializer = BorrowedBytesDeserializer<'de, E>;
-
-    fn from(self) -> Self::Deserializer {
-        BorrowedBytesDeserializer::new(self.0)
-    }
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-pub struct FlatMapDeserializer<'a, 'de: 'a, E>(
-    pub &'a mut Vec<Option<(Content<'de>, Content<'de>)>>,
-    pub PhantomData<E>,
-);
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-impl<'a, 'de, E> FlatMapDeserializer<'a, 'de, E>
-where
-    E: Error,
-{
-    fn deserialize_other<V>() -> Result<V, E> {
-        Err(Error::custom("can only flatten structs and maps"))
-    }
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-macro_rules! forward_to_deserialize_other {
-    ($($func:ident ($($arg:ty),*))*) => {
-        $(
-            fn $func<V>(self, $(_: $arg,)* _visitor: V) -> Result<V::Value, Self::Error>
-            where
-                V: Visitor<'de>,
-            {
-                Self::deserialize_other()
-            }
-        )*
-    }
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-impl<'a, 'de, E> Deserializer<'de> for FlatMapDeserializer<'a, 'de, E>
-where
-    E: Error,
-{
-    type Error = E;
-
-    fn deserialize_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        self.deserialize_map(visitor)
-    }
-
-    fn deserialize_enum<V>(
-        self,
-        name: &'static str,
-        variants: &'static [&'static str],
-        visitor: V,
-    ) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        for entry in self.0 {
-            if let Some((key, value)) = flat_map_take_entry(entry, variants) {
-                return visitor.visit_enum(EnumDeserializer::new(key, Some(value)));
-            }
-        }
-
-        Err(Error::custom(format_args!(
-            "no variant of enum {} found in flattened data",
-            name
-        )))
-    }
-
-    fn deserialize_map<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        visitor.visit_map(FlatMapAccess {
-            iter: self.0.iter(),
-            pending_content: None,
-            _marker: PhantomData,
-        })
-    }
-
-    fn deserialize_struct<V>(
-        self,
-        _: &'static str,
-        fields: &'static [&'static str],
-        visitor: V,
-    ) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        visitor.visit_map(FlatStructAccess {
-            iter: self.0.iter_mut(),
-            pending_content: None,
-            fields,
-            _marker: PhantomData,
-        })
-    }
-
-    fn deserialize_newtype_struct<V>(self, _name: &str, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        visitor.visit_newtype_struct(self)
-    }
-
-    fn deserialize_option<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        match visitor.__private_visit_untagged_option(self) {
-            Ok(value) => Ok(value),
-            Err(()) => Self::deserialize_other(),
-        }
-    }
-
-    fn deserialize_unit<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        visitor.visit_unit()
-    }
-
-    fn deserialize_ignored_any<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        visitor.visit_unit()
-    }
-
-    forward_to_deserialize_other! {
-        deserialize_bool()
-        deserialize_i8()
-        deserialize_i16()
-        deserialize_i32()
-        deserialize_i64()
-        deserialize_u8()
-        deserialize_u16()
-        deserialize_u32()
-        deserialize_u64()
-        deserialize_f32()
-        deserialize_f64()
-        deserialize_char()
-        deserialize_str()
-        deserialize_string()
-        deserialize_bytes()
-        deserialize_byte_buf()
-        deserialize_unit_struct(&'static str)
-        deserialize_seq()
-        deserialize_tuple(usize)
-        deserialize_tuple_struct(&'static str, usize)
-        deserialize_identifier()
-    }
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-struct FlatMapAccess<'a, 'de: 'a, E> {
-    iter: slice::Iter<'a, Option<(Content<'de>, Content<'de>)>>,
-    pending_content: Option<&'a Content<'de>>,
-    _marker: PhantomData<E>,
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-impl<'a, 'de, E> MapAccess<'de> for FlatMapAccess<'a, 'de, E>
-where
-    E: Error,
-{
-    type Error = E;
-
-    fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
-    where
-        T: DeserializeSeed<'de>,
-    {
-        for item in &mut self.iter {
-            // Items in the vector are nulled out when used by a struct.
-            if let Some((ref key, ref content)) = *item {
-                // Do not take(), instead borrow this entry. The internally tagged
-                // enum does its own buffering so we can't tell whether this entry
-                // is going to be consumed. Borrowing here leaves the entry
-                // available for later flattened fields.
-                self.pending_content = Some(content);
-                return seed.deserialize(ContentRefDeserializer::new(key)).map(Some);
-            }
-        }
-        Ok(None)
-    }
-
-    fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
-    where
-        T: DeserializeSeed<'de>,
-    {
-        match self.pending_content.take() {
-            Some(value) => seed.deserialize(ContentRefDeserializer::new(value)),
-            None => Err(Error::custom("value is missing")),
-        }
-    }
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-struct FlatStructAccess<'a, 'de: 'a, E> {
-    iter: slice::IterMut<'a, Option<(Content<'de>, Content<'de>)>>,
-    pending_content: Option<Content<'de>>,
-    fields: &'static [&'static str],
-    _marker: PhantomData<E>,
-}
-
-#[cfg(any(feature = "std", feature = "alloc"))]
-impl<'a, 'de, E> MapAccess<'de> for FlatStructAccess<'a, 'de, E>
-where
-    E: Error,
-{
-    type Error = E;
-
-    fn next_key_seed<T>(&mut self, seed: T) -> Result<Option<T::Value>, Self::Error>
-    where
-        T: DeserializeSeed<'de>,
-    {
-        for entry in self.iter.by_ref() {
-            if let Some((key, content)) = flat_map_take_entry(entry, self.fields) {
-                self.pending_content = Some(content);
-                return seed.deserialize(ContentDeserializer::new(key)).map(Some);
-            }
-        }
-        Ok(None)
-    }
-
-    fn next_value_seed<T>(&mut self, seed: T) -> Result<T::Value, Self::Error>
-    where
-        T: DeserializeSeed<'de>,
-    {
-        match self.pending_content.take() {
-            Some(value) => seed.deserialize(ContentDeserializer::new(value)),
-            None => Err(Error::custom("value is missing")),
-        }
-    }
-}
-
-/// Claims one key-value pair from a FlatMapDeserializer's field buffer if the
-/// field name matches any of the recognized ones.
-#[cfg(any(feature = "std", feature = "alloc"))]
-fn flat_map_take_entry<'de>(
-    entry: &mut Option<(Content<'de>, Content<'de>)>,
-    recognized: &[&str],
-) -> Option<(Content<'de>, Content<'de>)> {
-    // Entries in the FlatMapDeserializer buffer are nulled out as they get
-    // claimed for deserialization. We only use an entry if it is still present
-    // and if the field is one recognized by the current data structure.
-    let is_recognized = match entry {
-        None => false,
-        Some((k, _v)) => k.as_str().map_or(false, |name| recognized.contains(&name)),
-    };
-
-    if is_recognized {
-        entry.take()
-    } else {
-        None
-    }
-}
-
-pub struct AdjacentlyTaggedEnumVariantSeed<F> {
-    pub enum_name: &'static str,
-    pub variants: &'static [&'static str],
-    pub fields_enum: PhantomData<F>,
-}
-
-pub struct AdjacentlyTaggedEnumVariantVisitor<F> {
-    enum_name: &'static str,
-    fields_enum: PhantomData<F>,
-}
-
-impl<'de, F> Visitor<'de> for AdjacentlyTaggedEnumVariantVisitor<F>
-where
-    F: Deserialize<'de>,
-{
-    type Value = F;
-
-    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
-        write!(formatter, "variant of enum {}", self.enum_name)
-    }
-
-    fn visit_enum<A>(self, data: A) -> Result<Self::Value, A::Error>
-    where
-        A: EnumAccess<'de>,
-    {
-        let (variant, variant_access) = tri!(data.variant());
-        tri!(variant_access.unit_variant());
-        Ok(variant)
-    }
-}
-
-impl<'de, F> DeserializeSeed<'de> for AdjacentlyTaggedEnumVariantSeed<F>
-where
-    F: Deserialize<'de>,
-{
-    type Value = F;
-
-    fn deserialize<D>(self, deserializer: D) -> Result<Self::Value, D::Error>
-    where
-        D: Deserializer<'de>,
-    {
-        deserializer.deserialize_enum(
-            self.enum_name,
-            self.variants,
-            AdjacentlyTaggedEnumVariantVisitor {
-                enum_name: self.enum_name,
-                fields_enum: PhantomData,
-            },
-        )
-    }
-}