Rollup merge of #23329 - jbcrail:rm-syntax-highlight, r=sanxiyn

As suggested by @steveklabnik in #23254, I removed the redundant Rust syntax highlighting from the documentation.

src/libcore/macros.rs

@@ -216,7 +216,7 @@ macro_rules! writeln {
 ///
 /// Match arms:
 ///
-/// ```rust
+/// ```
 /// fn foo(x: Option<int>) {
 ///     match x {
 ///         Some(n) if n >= 0 => println!("Some(Non-negative)"),
@@ -229,7 +229,7 @@ macro_rules! writeln {
 ///
 /// Iterators:
 ///
-/// ```rust
+/// ```
 /// fn divide_by_three(x: u32) -> u32 { // one of the poorest implementations of x/3
 ///     for i in std::iter::count(0, 1) {
 ///         if 3*i < i { panic!("u32 overflow"); }

src/libcore/marker.rs

@@ -310,7 +310,7 @@ impl<T:?Sized> MarkerTrait for T { }
 ///
 /// Therefore, we can model a method like this as follows:
 ///
-/// ```rust
+/// ```
 /// use std::marker::PhantomFn;
 /// trait Even : PhantomFn<Self> { }
 /// ```
@@ -318,7 +318,7 @@ impl<T:?Sized> MarkerTrait for T { }
 /// Another equivalent, but clearer, option would be to use
 /// `MarkerTrait`:
 ///
-/// ```rust
+/// ```
 /// use std::marker::MarkerTrait;
 /// trait Even : MarkerTrait { }
 /// ```

src/libcore/mem.rs

@@ -251,7 +251,7 @@ pub fn swap<T>(x: &mut T, y: &mut T) {
 /// `self.buf`. But `replace` can be used to disassociate the original value of `self.buf` from
 /// `self`, allowing it to be returned:
 ///
-/// ```rust
+/// ```
 /// use std::mem;
 /// # struct Buffer<T> { buf: Vec<T> }
 /// impl<T> Buffer<T> {

src/libcore/num/f32.rs

@@ -281,7 +281,7 @@ impl Float for f32 {
 
     /// The fractional part of the number, satisfying:
     ///
-    /// ```rust
+    /// ```
     /// use core::num::Float;
     ///
     /// let x = 1.65f32;

src/libcore/num/f64.rs

@@ -288,7 +288,7 @@ impl Float for f64 {
 
     /// The fractional part of the number, satisfying:
     ///
-    /// ```rust
+    /// ```
     /// use core::num::Float;
     ///
     /// let x = 1.65f64;

src/libcore/num/mod.rs

@@ -84,7 +84,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0b01001100u8;
@@ -99,7 +99,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0b01001100u8;
@@ -118,7 +118,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0b0101000u16;
@@ -134,7 +134,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0b0101000u16;
@@ -150,7 +150,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0x0123456789ABCDEFu64;
@@ -167,7 +167,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0x0123456789ABCDEFu64;
@@ -183,7 +183,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0x0123456789ABCDEFu64;
@@ -200,7 +200,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0x0123456789ABCDEFu64;
@@ -223,7 +223,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0x0123456789ABCDEFu64;
@@ -246,7 +246,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0x0123456789ABCDEFu64;
@@ -269,7 +269,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// let n = 0x0123456789ABCDEFu64;
@@ -291,7 +291,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// assert_eq!(5u16.checked_add(65530), Some(65535));
@@ -305,7 +305,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// assert_eq!((-127i8).checked_sub(1), Some(-128));
@@ -319,7 +319,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// assert_eq!(5u8.checked_mul(51), Some(255));
@@ -333,7 +333,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// assert_eq!((-127i8).checked_div(-1), Some(127));
@@ -371,7 +371,7 @@ pub trait Int
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::num::Int;
     ///
     /// assert_eq!(2.pow(4), 16);

src/libcore/ops.rs

@@ -78,7 +78,7 @@ use fmt;
 /// A trivial implementation of `Drop`. The `drop` method is called when `_x` goes
 /// out of scope, and therefore `main` prints `Dropping!`.
 ///
-/// ```rust
+/// ```
 /// struct HasDrop;
 ///
 /// impl Drop for HasDrop {
@@ -162,7 +162,7 @@ macro_rules! forward_ref_binop {
 /// A trivial implementation of `Add`. When `Foo + Foo` happens, it ends up
 /// calling `add`, and therefore, `main` prints `Adding!`.
 ///
-/// ```rust
+/// ```
 /// use std::ops::Add;
 ///
 /// #[derive(Copy)]
@@ -216,7 +216,7 @@ add_impl! { usize u8 u16 u32 u64 isize i8 i16 i32 i64 f32 f64 }
 /// A trivial implementation of `Sub`. When `Foo - Foo` happens, it ends up
 /// calling `sub`, and therefore, `main` prints `Subtracting!`.
 ///
-/// ```rust
+/// ```
 /// use std::ops::Sub;
 ///
 /// #[derive(Copy)]
@@ -270,7 +270,7 @@ sub_impl! { usize u8 u16 u32 u64 isize i8 i16 i32 i64 f32 f64 }
 /// A trivial implementation of `Mul`. When `Foo * Foo` happens, it ends up
 /// calling `mul`, and therefore, `main` prints `Multiplying!`.
 ///
-/// ```rust
+/// ```
 /// use std::ops::Mul;
 ///
 /// #[derive(Copy)]

src/libcore/option.rs

@@ -897,7 +897,7 @@ impl<A, V: FromIterator<A>> FromIterator<Option<A>> for Option<V> {
     /// Here is an example which increments every integer in a vector,
     /// checking for overflow:
     ///
-    /// ```rust
+    /// ```
     /// use std::u16;
     ///
     /// let v = vec!(1, 2);

src/libcore/result.rs

@@ -896,7 +896,7 @@ impl<A, E, V: FromIterator<A>> FromIterator<Result<A, E>> for Result<V, E> {
     /// Here is an example which increments every integer in a vector,
     /// checking for overflow:
     ///
-    /// ```rust
+    /// ```
     /// use std::u32;
     ///
     /// let v = vec!(1, 2);

src/libcore/slice.rs

@@ -1449,7 +1449,7 @@ pub fn mut_ref_slice<'a, A>(s: &'a mut A) -> &'a mut [A] {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::slice;
 ///
 /// // manifest a slice out of thin air!
@@ -1492,7 +1492,7 @@ pub unsafe fn from_raw_parts_mut<'a, T>(p: *mut T, len: usize) -> &'a mut [T] {
 ///
 /// # Examples
 ///
-/// ```rust
+/// ```
 /// use std::slice;
 ///
 /// // manifest a slice out of thin air!

src/libcore/str/mod.rs

@@ -140,7 +140,7 @@ impl FromStr for bool {
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// use std::str::FromStr;
     ///
     /// assert_eq!(FromStr::from_str("true"), Ok(true));
@@ -151,7 +151,7 @@ impl FromStr for bool {
     /// Note, in many cases, the StrExt::parse() which is based on
     /// this FromStr::from_str() is more proper.
     ///
-    /// ```rust
+    /// ```
     /// assert_eq!("true".parse(), Ok(true));
     /// assert_eq!("false".parse(), Ok(false));
     /// assert!("not even a boolean".parse::<bool>().is_err());
@@ -1186,7 +1186,7 @@ mod traits {
     ///
     /// # Examples
     ///
-    /// ```rust
+    /// ```
     /// let s = "Löwe 老虎 Léopard";
     /// assert_eq!(&s[0 .. 1], "L");
     ///