Set all doc tests to 2018 edition

serde/src/ser/mod.rs

@@ -137,7 +137,7 @@ macro_rules! declare_error_trait {
             /// For example, a filesystem [`Path`] may refuse to serialize
             /// itself if it contains invalid UTF-8 data.
             ///
-            /// ```rust
+            /// ```edition2018
             /// # struct Path;
             /// #
             /// # impl Path {
@@ -210,7 +210,7 @@ pub trait Serialize {
     /// See the [Implementing `Serialize`] section of the manual for more
     /// information about how to implement this method.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::ser::{Serialize, SerializeStruct, Serializer};
     ///
     /// struct Person {
@@ -377,7 +377,7 @@ pub trait Serializer: Sized {
 
     /// Serialize a `bool` value.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -399,7 +399,7 @@ pub trait Serializer: Sized {
     /// reasonable implementation would be to cast the value to `i64` and
     /// forward to `serialize_i64`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -421,7 +421,7 @@ pub trait Serializer: Sized {
     /// reasonable implementation would be to cast the value to `i64` and
     /// forward to `serialize_i64`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -443,7 +443,7 @@ pub trait Serializer: Sized {
     /// reasonable implementation would be to cast the value to `i64` and
     /// forward to `serialize_i64`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -461,7 +461,7 @@ pub trait Serializer: Sized {
 
     /// Serialize an `i64` value.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -480,7 +480,7 @@ pub trait Serializer: Sized {
     serde_if_integer128! {
         /// Serialize an `i128` value.
         ///
-        /// ```rust
+        /// ```edition2018
         /// # use serde::Serializer;
         /// #
         /// # serde::__private_serialize!();
@@ -509,7 +509,7 @@ pub trait Serializer: Sized {
     /// reasonable implementation would be to cast the value to `u64` and
     /// forward to `serialize_u64`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -531,7 +531,7 @@ pub trait Serializer: Sized {
     /// reasonable implementation would be to cast the value to `u64` and
     /// forward to `serialize_u64`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -553,7 +553,7 @@ pub trait Serializer: Sized {
     /// reasonable implementation would be to cast the value to `u64` and
     /// forward to `serialize_u64`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -571,7 +571,7 @@ pub trait Serializer: Sized {
 
     /// Serialize a `u64` value.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -590,7 +590,7 @@ pub trait Serializer: Sized {
     serde_if_integer128! {
         /// Serialize a `u128` value.
         ///
-        /// ```rust
+        /// ```edition2018
         /// # use serde::Serializer;
         /// #
         /// # serde::__private_serialize!();
@@ -619,7 +619,7 @@ pub trait Serializer: Sized {
     /// reasonable implementation would be to cast the value to `f64` and
     /// forward to `serialize_f64`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -637,7 +637,7 @@ pub trait Serializer: Sized {
 
     /// Serialize an `f64` value.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -658,7 +658,7 @@ pub trait Serializer: Sized {
     /// If the format does not support characters, it is reasonable to serialize
     /// it as a single element `str` or a `u32`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -676,7 +676,7 @@ pub trait Serializer: Sized {
 
     /// Serialize a `&str`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -700,7 +700,7 @@ pub trait Serializer: Sized {
     /// `serialize_seq`. If forwarded, the implementation looks usually just
     /// like this:
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::ser::{Serializer, SerializeSeq};
     /// # use serde::private::ser::Error;
     /// #
@@ -729,7 +729,7 @@ pub trait Serializer: Sized {
 
     /// Serialize a [`None`] value.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::{Serialize, Serializer};
     /// #
     /// # enum Option<T> {
@@ -762,7 +762,7 @@ pub trait Serializer: Sized {
 
     /// Serialize a [`Some(T)`] value.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::{Serialize, Serializer};
     /// #
     /// # enum Option<T> {
@@ -797,7 +797,7 @@ pub trait Serializer: Sized {
 
     /// Serialize a `()` value.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use serde::Serializer;
     /// #
     /// # serde::__private_serialize!();
@@ -817,7 +817,7 @@ pub trait Serializer: Sized {
     ///
     /// A reasonable implementation would be to forward to `serialize_unit`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// struct Nothing;
@@ -839,7 +839,7 @@ pub trait Serializer: Sized {
     /// this variant within the enum, and the `variant` is the name of the
     /// variant.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// enum E {
@@ -872,7 +872,7 @@ pub trait Serializer: Sized {
     /// wrappers around the data they contain. A reasonable implementation would
     /// be to forward to `value.serialize(self)`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// struct Millimeters(u8);
@@ -900,7 +900,7 @@ pub trait Serializer: Sized {
     /// this variant within the enum, and the `variant` is the name of the
     /// variant. The `value` is the data contained within this newtype variant.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// enum E {
@@ -938,7 +938,7 @@ pub trait Serializer: Sized {
     /// not be computable before the sequence is iterated. Some serializers only
     /// support sequences whose length is known up front.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use std::marker::PhantomData;
     /// #
     /// # struct Vec<T>(PhantomData<T>);
@@ -983,7 +983,7 @@ pub trait Serializer: Sized {
     /// This call must be followed by zero or more calls to `serialize_element`,
     /// then a call to `end`.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::ser::{Serialize, Serializer, SerializeTuple};
     ///
     /// # mod fool {
@@ -1013,7 +1013,7 @@ pub trait Serializer: Sized {
     /// }
     /// ```
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::ser::{Serialize, SerializeTuple, Serializer};
     ///
     /// const VRAM_SIZE: usize = 386;
@@ -1041,7 +1041,7 @@ pub trait Serializer: Sized {
     /// The `name` is the name of the tuple struct and the `len` is the number
     /// of data fields that will be serialized.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::ser::{Serialize, SerializeTupleStruct, Serializer};
     ///
     /// struct Rgb(u8, u8, u8);
@@ -1073,7 +1073,7 @@ pub trait Serializer: Sized {
     /// this variant within the enum, the `variant` is the name of the variant,
     /// and the `len` is the number of data fields that will be serialized.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::ser::{Serialize, SerializeTupleVariant, Serializer};
     ///
     /// enum E {
@@ -1119,7 +1119,7 @@ pub trait Serializer: Sized {
     /// be computable before the map is iterated. Some serializers only support
     /// maps whose length is known up front.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # use std::marker::PhantomData;
     /// #
     /// # struct HashMap<K, V>(PhantomData<K>, PhantomData<V>);
@@ -1167,7 +1167,7 @@ pub trait Serializer: Sized {
     /// The `name` is the name of the struct and the `len` is the number of
     /// data fields that will be serialized.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::ser::{Serialize, SerializeStruct, Serializer};
     ///
     /// struct Rgb {
@@ -1203,7 +1203,7 @@ pub trait Serializer: Sized {
     /// this variant within the enum, the `variant` is the name of the variant,
     /// and the `len` is the number of data fields that will be serialized.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::ser::{Serialize, SerializeStructVariant, Serializer};
     ///
     /// enum E {
@@ -1245,7 +1245,7 @@ pub trait Serializer: Sized {
     /// using [`serialize_seq`]. Implementors should not need to override this
     /// method.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::{Serialize, Serializer};
     ///
     /// struct SecretlyOneHigher {
@@ -1282,7 +1282,7 @@ pub trait Serializer: Sized {
     /// using [`serialize_map`]. Implementors should not need to override this
     /// method.
     ///
-    /// ```rust
+    /// ```edition2018
     /// use serde::{Serialize, Serializer};
     /// use std::collections::BTreeSet;
     ///
@@ -1322,7 +1322,7 @@ pub trait Serializer: Sized {
     /// delegates to [`serialize_str`]. Serializers are encouraged to provide a
     /// more efficient implementation if possible.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # struct DateTime;
     /// #
     /// # impl DateTime {
@@ -1363,7 +1363,7 @@ pub trait Serializer: Sized {
     /// of this method. If no more sensible behavior is possible, the
     /// implementation is expected to return an error.
     ///
-    /// ```rust
+    /// ```edition2018
     /// # struct DateTime;
     /// #
     /// # impl DateTime {
@@ -1398,7 +1398,7 @@ pub trait Serializer: Sized {
     /// human-readable one and binary formats like Bincode will prefer the
     /// compact one.
     ///
-    /// ```
+    /// ```edition2018
     /// # use std::fmt::{self, Display};
     /// #
     /// # struct Timestamp;
@@ -1447,7 +1447,7 @@ pub trait Serializer: Sized {
 ///
 /// # Example use
 ///
-/// ```rust
+/// ```edition2018
 /// # use std::marker::PhantomData;
 /// #
 /// # struct Vec<T>(PhantomData<T>);
@@ -1511,7 +1511,7 @@ pub trait SerializeSeq {
 ///
 /// # Example use
 ///
-/// ```rust
+/// ```edition2018
 /// use serde::ser::{Serialize, Serializer, SerializeTuple};
 ///
 /// # mod fool {
@@ -1541,7 +1541,7 @@ pub trait SerializeSeq {
 /// }
 /// ```
 ///
-/// ```rust
+/// ```edition2018
 /// # use std::marker::PhantomData;
 /// #
 /// # struct Array<T>(PhantomData<T>);
@@ -1611,7 +1611,7 @@ pub trait SerializeTuple {
 ///
 /// # Example use
 ///
-/// ```rust
+/// ```edition2018
 /// use serde::ser::{Serialize, SerializeTupleStruct, Serializer};
 ///
 /// struct Rgb(u8, u8, u8);
@@ -1656,7 +1656,7 @@ pub trait SerializeTupleStruct {
 ///
 /// # Example use
 ///
-/// ```rust
+/// ```edition2018
 /// use serde::ser::{Serialize, SerializeTupleVariant, Serializer};
 ///
 /// enum E {
@@ -1714,7 +1714,7 @@ pub trait SerializeTupleVariant {
 ///
 /// # Example use
 ///
-/// ```rust
+/// ```edition2018
 /// # use std::marker::PhantomData;
 /// #
 /// # struct HashMap<K, V>(PhantomData<K>, PhantomData<V>);
@@ -1825,7 +1825,7 @@ pub trait SerializeMap {
 ///
 /// # Example use
 ///
-/// ```rust
+/// ```edition2018
 /// use serde::ser::{Serialize, SerializeStruct, Serializer};
 ///
 /// struct Rgb {
@@ -1885,7 +1885,7 @@ pub trait SerializeStruct {
 ///
 /// # Example use
 ///
-/// ```rust
+/// ```edition2018
 /// use serde::ser::{Serialize, SerializeStructVariant, Serializer};
 ///
 /// enum E {