Rollup merge of #25580 - killercup:trpl/unify-code-blocks, r=steveklabnik

This adds strictly more information to the source files and reduces the need for customized tooling to render the book. (While this should not change the output of _rustbook_, it is very useful when rendering the sources with external tools like Pandoc.)

This only adds the language marker to "first level" code blocks (and not to code blocks in comments inside of code examples).

r? @steveklabnik

src/doc/trpl/benchmark-tests.md

@@ -3,7 +3,7 @@
 Rust supports benchmark tests, which can test the performance of your
 code. Let's make our `src/lib.rs` look like this (comments elided):
 
-```{rust,ignore}
+```rust,ignore
 #![feature(test)]
 
 extern crate test;
@@ -77,7 +77,7 @@ the benchmark is no longer benchmarking what one expects. For example, the
 compiler might recognize that some calculation has no external effects and
 remove it entirely.
 
-```{rust,ignore}
+```rust,ignore
 #![feature(test)]
 
 extern crate test;

src/doc/trpl/borrow-and-asref.md

@@ -51,7 +51,7 @@ kind of borrowed value. This is especially true of references and slices: you
 can have both an `&T` or a `&mut T`. If we wanted to accept both of these types,
 `Borrow` is up for it:
 
-```
+```rust
 use std::borrow::Borrow;
 use std::fmt::Display;
 

src/doc/trpl/box-syntax-and-patterns.md

@@ -5,7 +5,7 @@ Also it is not possible in stable Rust to destructure a `Box` in a match
 pattern. The unstable `box` keyword can be used to both create and destructure
 a `Box`. An example usage would be:
 
-```
+```rust
 #![feature(box_syntax, box_patterns)]
 
 fn main() {
@@ -34,7 +34,7 @@ because the syntax may still change in the future.
 In many languages with pointers, you'd return a pointer from a function
 so as to avoid copying a large data structure. For example:
 
-```{rust}
+```rust
 struct BigStruct {
     one: i32,
     two: i32,

src/doc/trpl/concurrency.md

@@ -59,7 +59,7 @@ place!
 Rust's standard library provides a library for threads, which allow you to
 run Rust code in parallel. Here's a basic example of using `std::thread`:
 
-```
+```rust
 use std::thread;
 
 fn main() {
@@ -73,7 +73,7 @@ The `thread::spawn()` method accepts a closure, which is executed in a
 new thread. It returns a handle to the thread, that can be used to
 wait for the child thread to finish and extract its result:
 
-```
+```rust
 use std::thread;
 
 fn main() {
@@ -189,7 +189,7 @@ guard across thread boundaries, which gives us our error.
 
 We can use `Arc<T>` to fix this. Here's the working version:
 
-```
+```rust
 use std::sync::{Arc, Mutex};
 use std::thread;
 
@@ -248,7 +248,7 @@ threads with each other. Let's talk about one of them: channels.
 Here's a version of our code that uses channels for synchronization, rather
 than waiting for a specific time:
 
-```
+```rust
 use std::sync::{Arc, Mutex};
 use std::thread;
 use std::sync::mpsc;
@@ -281,7 +281,7 @@ a simple `()` down the channel, and then wait for ten of them to come back.
 While this channel is just sending a generic signal, we can send any data that
 is `Send` over the channel!
 
-```
+```rust
 use std::thread;
 use std::sync::mpsc;
 
@@ -311,7 +311,7 @@ the answer, and then it `send()`s us the answer over the channel.
 A `panic!` will crash the currently executing thread. You can use Rust's
 threads as a simple isolation mechanism:
 
-```
+```rust
 use std::thread;
 
 let result = thread::spawn(move || {

src/doc/trpl/crates-and-modules.md

@@ -75,7 +75,7 @@ above.
 To define each of our modules, we use the `mod` keyword. Let’s make our
 `src/lib.rs` look like this:
 
-```
+```rust
 mod english {
     mod greetings {
     }
@@ -126,7 +126,7 @@ ways.
 
 Instead of declaring a module like this:
 
-```{rust,ignore}
+```rust,ignore
 mod english {
     // contents of our module go here
 }
@@ -134,7 +134,7 @@ mod english {
 
 We can instead declare our module like this:
 
-```{rust,ignore}
+```rust,ignore
 mod english;
 ```
 
@@ -173,7 +173,7 @@ $ tree .
 
 `src/lib.rs` is our crate root, and looks like this:
 
-```{rust,ignore}
+```rust,ignore
 mod english;
 mod japanese;
 ```
@@ -184,7 +184,7 @@ on our preference. In this case, because our modules have sub-modules, we’ve
 chosen the second. Both `src/english/mod.rs` and `src/japanese/mod.rs` look
 like this:
 
-```{rust,ignore}
+```rust,ignore
 mod greetings;
 mod farewells;
 ```
@@ -297,7 +297,7 @@ public, and so private is the default. To make things public, you use the `pub`
 keyword. Let’s focus on the `english` module first, so let’s reduce our `src/main.rs`
 to just this:
 
-```{rust,ignore}
+```rust,ignore
 extern crate phrases;
 
 fn main() {
@@ -308,21 +308,21 @@ fn main() {
 
 In our `src/lib.rs`, let’s add `pub` to the `english` module declaration:
 
-```{rust,ignore}
+```rust,ignore
 pub mod english;
 mod japanese;
 ```
 
 And in our `src/english/mod.rs`, let’s make both `pub`:
 
-```{rust,ignore}
+```rust,ignore
 pub mod greetings;
 pub mod farewells;
 ```
 
 In our `src/english/greetings.rs`, let’s add `pub` to our `fn` declaration:
 
-```{rust,ignore}
+```rust,ignore
 pub fn hello() -> String {
     "Hello!".to_string()
 }
@@ -330,7 +330,7 @@ pub fn hello() -> String {
 
 And also in `src/english/farewells.rs`:
 
-```{rust,ignore}
+```rust,ignore
 pub fn goodbye() -> String {
     "Goodbye.".to_string()
 }
@@ -365,7 +365,7 @@ refer to them with shorter names. Let’s talk about `use`.
 Rust has a `use` keyword, which allows us to import names into our local scope.
 Let’s change our `src/main.rs` to look like this:
 
-```{rust,ignore}
+```rust,ignore
 extern crate phrases;
 
 use phrases::english::greetings;
@@ -382,7 +382,7 @@ the functions by a much shorter name. By convention, when importing functions, i
 considered best practice to import the module, rather than the function directly. In
 other words, you _can_ do this:
 
-```{rust,ignore}
+```rust,ignore
 extern crate phrases;
 
 use phrases::english::greetings::hello;
@@ -400,7 +400,7 @@ becomes a problem. If we have conflicting names, Rust will give a compilation
 error. For example, if we made the `japanese` functions public, and tried to do
 this:
 
-```{rust,ignore}
+```rust,ignore
 extern crate phrases;
 
 use phrases::english::greetings::hello;
@@ -426,14 +426,14 @@ Could not compile `phrases`.
 If we’re importing multiple names from the same module, we don’t have to type it out
 twice. Instead of this:
 
-```{rust,ignore}
+```rust,ignore
 use phrases::english::greetings;
 use phrases::english::farewells;
 ```
 
 We can use this shortcut:
 
-```{rust,ignore}
+```rust,ignore
 use phrases::english::{greetings, farewells};
 ```
 
@@ -445,7 +445,7 @@ interface that may not directly map to your internal code organization.
 
 Let’s look at an example. Modify your `src/main.rs` to read like this:
 
-```{rust,ignore}
+```rust,ignore
 extern crate phrases;
 
 use phrases::english::{greetings,farewells};
@@ -462,14 +462,14 @@ fn main() {
 
 Then, modify your `src/lib.rs` to make the `japanese` mod public:
 
-```{rust,ignore}
+```rust,ignore
 pub mod english;
 pub mod japanese;
 ```
 
 Next, make the two functions public, first in `src/japanese/greetings.rs`:
 
-```{rust,ignore}
+```rust,ignore
 pub fn hello() -> String {
     "こんにちは".to_string()
 }
@@ -477,7 +477,7 @@ pub fn hello() -> String {
 
 And then in `src/japanese/farewells.rs`:
 
-```{rust,ignore}
+```rust,ignore
 pub fn goodbye() -> String {
     "さようなら".to_string()
 }
@@ -485,7 +485,7 @@ pub fn goodbye() -> String {
 
 Finally, modify your `src/japanese/mod.rs` to read like this:
 
-```{rust,ignore}
+```rust,ignore
 pub use self::greetings::hello;
 pub use self::farewells::goodbye;
 

src/doc/trpl/documentation.md

@@ -42,7 +42,7 @@ Documentation comments are written in Markdown.
 Rust keeps track of these comments, and uses them when generating
 documentation. This is important when documenting things like enums:
 
-```
+```rust
 /// The `Option` type. See [the module level documentation](../) for more.
 enum Option<T> {
     /// No value
@@ -80,7 +80,7 @@ thing after that last comment.
 
 Anyway, let's cover each part of this comment in detail:
 
-```
+```rust
 /// Constructs a new `Rc<T>`.
 # fn foo() {}
 ```
@@ -88,7 +88,7 @@ Anyway, let's cover each part of this comment in detail:
 The first line of a documentation comment should be a short summary of its
 functionality. One sentence. Just the basics. High level.
 
-```
+```rust
 ///
 /// Other details about constructing `Rc<T>`s, maybe describing complicated
 /// semantics, maybe additional options, all kinds of stuff.
@@ -101,7 +101,7 @@ we could have added more explanation in a new paragraph.
 
 #### Special sections
 
-```
+```rust
 /// # Examples
 # fn foo() {}
 ```
@@ -110,7 +110,7 @@ Next, are special sections. These are indicated with a header, `#`. There
 are three kinds of headers that are commonly used. They aren't special syntax,
 just convention, for now.
 
-```
+```rust
 /// # Panics
 # fn foo() {}
 ```
@@ -120,7 +120,7 @@ usually indicated by panics, which kill the whole current thread at the very
 least. If your function has a non-trivial contract like this, that is
 detected/enforced by panics, documenting it is very important.
 
-```
+```rust
 /// # Failures
 # fn foo() {}
 ```
@@ -130,7 +130,7 @@ conditions under which it returns `Err(E)` is a nice thing to do. This is
 slightly less important than `Panics`, because failure is encoded into the type
 system, but it's still a good thing to do.
 
-```
+```rust
 /// # Safety
 # fn foo() {}
 ```
@@ -138,7 +138,7 @@ system, but it's still a good thing to do.
 If your function is `unsafe`, you should explain which invariants the caller is
 responsible for upholding.
 
-```
+```rust
 /// # Examples
 ///
 /// ```
@@ -154,7 +154,7 @@ method, and your users will love you for it. These examples go inside of
 code block annotations, which we'll talk about in a moment, and can have
 more than one section:
 
-```
+```rust
 /// # Examples
 ///
 /// Simple `&str` patterns:
@@ -179,7 +179,7 @@ Let's discuss the details of these code blocks.
 
 To write some Rust code in a comment, use the triple graves:
 
-```
+```rust
 /// ```
 /// println!("Hello, world");
 /// ```
@@ -188,7 +188,7 @@ To write some Rust code in a comment, use the triple graves:
 
 If you want something that's not Rust code, you can add an annotation:
 
-```
+```rust
 /// ```c
 /// printf("Hello, world\n");
 /// ```
@@ -208,7 +208,7 @@ generate the documentation.
 
 Let's discuss our sample example documentation:
 
-```
+```rust
 /// ```
 /// println!("Hello, world");
 /// ```
@@ -219,7 +219,7 @@ You'll notice that you don't need a `fn main()` or anything here. `rustdoc` will
 automatically add a main() wrapper around your code, and in the right place.
 For example:
 
-```
+```rust
 /// ```
 /// use std::rc::Rc;
 ///
@@ -230,7 +230,7 @@ For example:
 
 This will end up testing:
 
-```
+```rust
 fn main() {
     use std::rc::Rc;
     let five = Rc::new(5);
@@ -259,7 +259,7 @@ with `///` we've been talking about? The raw text:
 
 looks different than the output:
 
-```
+```rust
 /// Some documentation.
 # fn foo() {}
 ```
@@ -274,7 +274,7 @@ it makes the example more clear. You can use this technique to explain
 longer examples in detail, while still preserving the testability of your
 documentation. For example, this code:
 
-```
+```rust
 let x = 5;
 let y = 6;
 println!("{}", x + y);
@@ -284,7 +284,7 @@ Here's an explanation, rendered:
 
 First, we set `x` to five:
 
-```
+```rust
 let x = 5;
 # let y = 6;
 # println!("{}", x + y);
@@ -292,7 +292,7 @@ let x = 5;
 
 Next, we set `y` to six:
 
-```
+```rust
 # let x = 5;
 let y = 6;
 # println!("{}", x + y);
@@ -300,7 +300,7 @@ let y = 6;
 
 Finally, we print the sum of `x` and `y`:
 
-```
+```rust
 # let x = 5;
 # let y = 6;
 println!("{}", x + y);
@@ -340,7 +340,7 @@ explanation.
 
 Here’s an example of documenting a macro:
 
-```
+```rust
 /// Panic with a given message unless an expression evaluates to true.
 ///
 /// # Examples
@@ -388,7 +388,7 @@ but with a binary, there’s nothing to link to.
 There are a few more annotations that are useful to help `rustdoc` do the right
 thing when testing your code:
 
-```
+```rust
 /// ```ignore
 /// fn foo() {
 /// ```
@@ -400,7 +400,7 @@ what you want, as it's the most generic. Instead, consider annotating it
 with `text` if it's not code, or using `#`s to get a working example that
 only shows the part you care about.
 
-```
+```rust
 /// ```should_panic
 /// assert!(false);
 /// ```
@@ -410,7 +410,7 @@ only shows the part you care about.
 `should_panic` tells `rustdoc` that the code should compile correctly, but
 not actually pass as a test.
 
-```
+```rust
 /// ```no_run
 /// loop {
 ///     println!("Hello, world");
@@ -427,7 +427,7 @@ which you would want to make sure compile, but might run in an infinite loop!
 
 Rust has another kind of doc comment, `//!`. This comment doesn't document the next item, but the enclosing item. In other words:
 
-```
+```rust
 mod foo {
     //! This is documentation for the `foo` module.
     //!
@@ -440,7 +440,7 @@ mod foo {
 This is where you'll see `//!` used most often: for module documentation. If
 you have a module in `foo.rs`, you'll often open its code and see this:
 
-```
+```rust
 //! A module for using `foo`s.
 //!
 //! The `foo` module contains a lot of useful functionality blah blah blah
@@ -461,7 +461,7 @@ are written in Markdown, they're often `.md` files.
 When you write documentation in Markdown files, you don't need to prefix
 the documentation with comments. For example:
 
-```
+```rust
 /// # Examples
 ///
 /// ```
@@ -499,7 +499,7 @@ This `%` line needs to be the very first line of the file.
 
 At a deeper level, documentation comments are sugar for documentation attributes:
 
-```
+```rust
 /// this
 # fn foo() {}
 
@@ -509,7 +509,7 @@ At a deeper level, documentation comments are sugar for documentation attributes
 
 are the same, as are these:
 
-```
+```rust
 //! this
 
 #![doc="/// this"]
@@ -546,7 +546,7 @@ pub use foo::bar;
 You can control a few aspects of the HTML that `rustdoc` generates through the
 `#![doc]` version of the attribute:
 
-```
+```rust
 #![doc(html_logo_url = "http://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/")];

src/doc/trpl/error-handling.md

@@ -49,7 +49,7 @@ We use `assert!` to declare that something is true. If it's not true, something
 is very wrong. Wrong enough that we can't continue with things in the current
 state. Another example is using the `unreachable!()` macro:
 
-```{rust,ignore}
+```rust,ignore
 enum Event {
     NewRelease,
 }
@@ -188,7 +188,7 @@ The [`Debug`](../std/fmt/trait.Debug.html) trait is what lets us print the enum
 In the case of an error that is unexpected and not recoverable, the `panic!`
 macro will induce a panic. This will crash the current thread, and give an error:
 
-```{rust,ignore}
+```rust,ignore
 panic!("boom");
 ```
 
@@ -212,7 +212,7 @@ handle and possibly recover from error.
 If we don't want to handle this error, and would rather just abort the program,
 we can use the `unwrap()` method:
 
-```{rust,ignore}
+```rust,ignore
 io::stdin().read_line(&mut buffer).unwrap();
 ```
 
@@ -223,7 +223,7 @@ shorter. Sometimes, just crashing is appropriate.
 
 There's another way of doing this that's a bit nicer than `unwrap()`:
 
-```{rust,ignore}
+```rust,ignore
 let mut buffer = String::new();
 let input = io::stdin().read_line(&mut buffer)
                        .ok()

src/doc/trpl/ffi.md

@@ -81,7 +81,7 @@ vectors as pointers to memory. Rust's vectors are guaranteed to be a contiguous
 length is number of elements currently contained, and the capacity is the total size in elements of
 the allocated memory. The length is less than or equal to the capacity.
 
-```
+```rust
 # #![feature(libc)]
 # extern crate libc;
 # use libc::{c_int, size_t};
@@ -106,7 +106,7 @@ required capacity to hold the compressed output. The vector can then be passed t
 `snappy_compress` function as an output parameter. An output parameter is also passed to retrieve
 the true length after compression for setting the length.
 
-```
+```rust
 # #![feature(libc)]
 # extern crate libc;
 # use libc::{size_t, c_int};
@@ -133,7 +133,7 @@ pub fn compress(src: &[u8]) -> Vec<u8> {
 Decompression is similar, because snappy stores the uncompressed size as part of the compression
 format and `snappy_uncompressed_length` will retrieve the exact buffer size required.
 
-```
+```rust
 # #![feature(libc)]
 # extern crate libc;
 # use libc::{size_t, c_int};
@@ -375,7 +375,7 @@ the compiler that the unsafety does not leak out of the block.
 Unsafe functions, on the other hand, advertise it to the world. An unsafe function is written like
 this:
 
-```
+```rust
 unsafe fn kaboom(ptr: *const i32) -> i32 { *ptr }
 ```
 
@@ -439,7 +439,7 @@ Most foreign code exposes a C ABI, and Rust uses the platform's C calling conven
 calling foreign functions. Some foreign functions, most notably the Windows API, use other calling
 conventions. Rust provides a way to tell the compiler which convention to use:
 
-```
+```rust
 # #![feature(libc)]
 extern crate libc;
 
@@ -516,7 +516,7 @@ function pointer using the C ABI.
 You may wish to compile Rust code in a way so that it can be called from C. This is
 fairly easy, but requires a few things:
 
-```
+```rust
 #[no_mangle]
 pub extern fn hello_rust() -> *const u8 {
     "Hello, world!\0".as_ptr()

src/doc/trpl/functions.md

@@ -146,7 +146,7 @@ expression, although its value is not particularly useful. Unlike other
 languages where an assignment evaluates to the assigned value (e.g. `5` in the
 previous example), in Rust the value of an assignment is an empty tuple `()`:
 
-```
+```rust
 let mut y = 5;
 
 let x = (y = 6);  // x has the value `()`, not `6`
@@ -204,7 +204,7 @@ time.
 Rust has some special syntax for ‘diverging functions’, which are functions that
 do not return:
 
-```
+```rust
 fn diverges() -> ! {
     panic!("This function never returns!");
 }

src/doc/trpl/generics.md

@@ -110,7 +110,7 @@ Generic functions are most useful with ‘trait bounds’, which we’ll cover i
 
 You can store a generic type in a `struct` as well:
 
-```
+```rust
 struct Point<T> {
     x: T,
     y: T,

src/doc/trpl/guessing-game.md

@@ -151,7 +151,7 @@ take a name on the left hand side, it actually accepts a
 ‘[pattern][patterns]’. We’ll use patterns more later. It’s easy enough
 to use for now:
 
-```
+```rust
 let foo = 5; // immutable.
 let mut bar = 5; // mutable
 ```

src/doc/trpl/inline-assembly.md

@@ -25,7 +25,7 @@ crate to allow) and of course requires an `unsafe` block.
 The `assembly template` is the only required parameter and must be a
 literal string (i.e. `""`)
 
-```
+```rust
 #![feature(asm)]
 
 #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
@@ -51,7 +51,7 @@ fn main() {
 Output operands, input operands, clobbers and options are all optional
 but you must add the right number of `:` if you skip them:
 
-```
+```rust
 # #![feature(asm)]
 # #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 # fn main() { unsafe {
@@ -65,7 +65,7 @@ asm!("xor %eax, %eax"
 
 Whitespace also doesn't matter:
 
-```
+```rust
 # #![feature(asm)]
 # #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 # fn main() { unsafe {
@@ -79,7 +79,7 @@ Input and output operands follow the same format: `:
 "constraints1"(expr1), "constraints2"(expr2), ..."`. Output operand
 expressions must be mutable lvalues, or not yet assigned:
 
-```
+```rust
 # #![feature(asm)]
 # #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 fn add(a: i32, b: i32) -> i32 {
@@ -106,7 +106,7 @@ you want, and you are required to put the specific size of the
 operand. This is useful for very low level programming, where 
 which register you use is important:
 
-```
+```rust
 # #![feature(asm)]
 # #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 # unsafe fn read_byte_in(port: u16) -> u8 {
@@ -123,7 +123,7 @@ different values so we use the clobbers list to indicate to the
 compiler not to assume any values loaded into those registers will
 stay valid.
 
-```
+```rust
 # #![feature(asm)]
 # #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 # fn main() { unsafe {
@@ -155,7 +155,7 @@ Current valid options are:
    the compiler to insert its usual stack alignment code
 3. *intel* - use intel syntax instead of the default AT&T.
 
-```
+```rust
 # #![feature(asm)]
 # #[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
 # fn main() {

src/doc/trpl/intrinsics.md

@@ -10,7 +10,7 @@ context, but wished to be able to `transmute` between types, and
 perform efficient pointer arithmetic, one would import those functions
 via a declaration like
 
-```
+```rust
 # #![feature(intrinsics)]
 # fn main() {}
 

src/doc/trpl/iterators.md

@@ -116,7 +116,7 @@ A *consumer* operates on an iterator, returning some kind of value or values.
 The most common consumer is `collect()`. This code doesn't quite compile,
 but it shows the intention:
 
-```{rust,ignore}
+```rust,ignore
 let one_to_one_hundred = (1..101).collect();
 ```
 
@@ -253,7 +253,7 @@ we need to talk about with regards to iterators. Let's get to it!
 *Iterator adapters* take an iterator and modify it somehow, producing
 a new iterator. The simplest one is called `map`:
 
-```{rust,ignore}
+```rust,ignore
 (1..100).map(|x| x + 1);
 ```
 
@@ -272,7 +272,7 @@ warning: unused result which must be used: iterator adaptors are lazy and
 Laziness strikes again! That closure will never execute. This example
 doesn't print any numbers:
 
-```{rust,ignore}
+```rust,ignore
 (1..100).map(|x| println!("{}", x));
 ```
 

src/doc/trpl/lang-items.md

@@ -15,7 +15,7 @@ For example, `Box` pointers require two lang items, one for allocation
 and one for deallocation. A freestanding program that uses the `Box`
 sugar for dynamic allocations via `malloc` and `free`:
 
-```
+```rust
 #![feature(lang_items, box_syntax, start, no_std, libc)]
 #![no_std]
 

src/doc/trpl/macros.md

@@ -698,6 +698,7 @@ assert_eq!(5, 3 + 2);
 assert!(5 < 3);
 assert_eq!(5, 3);
 ```
+
 ## try!
 
 `try!` is used for error handling. It takes something that can return a

src/doc/trpl/method-syntax.md

@@ -89,7 +89,7 @@ So, now we know how to call a method, such as `foo.bar()`. But what about our
 original example, `foo.bar().baz()`? This is called ‘method chaining’, and we
 can do it by returning `self`.
 
-```
+```rust
 struct Circle {
     x: f64,
     y: f64,
@@ -117,7 +117,7 @@ fn main() {
 
 Check the return type:
 
-```
+```rust
 # struct Circle;
 # impl Circle {
 fn grow(&self) -> Circle {
@@ -167,7 +167,7 @@ and `y` attributes will be `0.0`, and the `radius` will be `1.0`. Rust doesn’t
 have method overloading, named arguments, or variable arguments. We employ
 the builder pattern instead. It looks like this:
 
-```
+```rust
 struct Circle {
     x: f64,
     y: f64,

src/doc/trpl/mutability.md

@@ -161,7 +161,7 @@ b.x = 10; // error: cannot assign to immutable field `b.x`
 
 However, by using `Cell<T>`, you can emulate field-level mutability:
 
-```
+```rust
 use std::cell::Cell;
 
 struct Point {

src/doc/trpl/no-stdlib.md

@@ -20,7 +20,7 @@ default shim for the C `main` function with your own.
 The function marked `#[start]` is passed the command line parameters
 in the same format as C:
 
-```
+```rust
 #![feature(lang_items, start, no_std, libc)]
 #![no_std]
 

src/doc/trpl/primitive-types.md

@@ -251,7 +251,7 @@ This pattern is very powerful, and we’ll see it repeated more later.
 You can disambiguate a single-element tuple from a value in parentheses with a
 comma:
 
-```
+```rust
 (0,); // single-element tuple
 (0); // zero in parentheses
 ```
@@ -283,7 +283,7 @@ documentation][tuple].
 
 Functions also have a type! They look like this:
 
-```
+```rust
 fn foo(x: i32) -> i32 { x }
 
 let x: fn(i32) -> i32 = foo;

src/doc/trpl/strings.md

@@ -38,7 +38,7 @@ println!("{}", s);
 
 `String`s will coerce into `&str` with an `&`:
 
-```
+```rust
 fn takes_slice(slice: &str) {
     println!("Got: {}", slice);
 }

src/doc/trpl/testing.md

@@ -195,7 +195,7 @@ parameter can be added to the `should_panic` attribute. The test harness will
 make sure that the failure message contains the provided text. A safer version
 of the example above would be:
 
-```
+```rust
 #[test]
 #[should_panic(expected = "assertion failed")]
 fn it_works() {
@@ -205,7 +205,7 @@ fn it_works() {
 
 That's all there is to the basics! Let's write one 'real' test:
 
-```{rust,ignore}
+```rust,ignore
 pub fn add_two(a: i32) -> i32 {
     a + 2
 }
@@ -225,7 +225,7 @@ There is one way in which our existing example is not idiomatic: it's
 missing the `tests` module. The idiomatic way of writing our example
 looks like this:
 
-```{rust,ignore}
+```rust,ignore
 pub fn add_two(a: i32) -> i32 {
     a + 2
 }
@@ -253,7 +253,7 @@ we need to bring our test function into scope. This can be annoying if you have
 a large module, and so this is a common use of the `glob` feature. Let's change
 our `src/lib.rs` to make use of it:
 
-```{rust,ignore}
+```rust,ignore
 
 pub fn add_two(a: i32) -> i32 {
     a + 2
@@ -302,7 +302,7 @@ the `tests` directory
 To write an integration test, let's make a `tests` directory, and
 put a `tests/lib.rs` file inside, with this as its contents:
 
-```{rust,ignore}
+```rust,ignore
 extern crate adder;
 
 #[test]
@@ -359,7 +359,7 @@ documentation has been written. To this end, Rust supports automatically
 running examples in your documentation. Here's a fleshed-out `src/lib.rs`
 with examples:
 
-```{rust,ignore}
+```rust,ignore
 //! The `adder` crate provides functions that add numbers to other numbers.
 //!
 //! # Examples

src/doc/trpl/traits.md

@@ -253,7 +253,7 @@ Writing functions with only a few generic types and a small number of trait
 bounds isn’t too bad, but as the number increases, the syntax gets increasingly
 awkward:
 
-```
+```rust
 use std::fmt::Debug;
 
 fn foo<T: Clone, K: Clone + Debug>(x: T, y: K) {
@@ -268,7 +268,7 @@ far right. The bounds are getting in the way.
 
 Rust has a solution, and it’s called a ‘`where` clause’:
 
-```
+```rust
 use std::fmt::Debug;
 
 fn foo<T: Clone, K: Clone + Debug>(x: T, y: K) {
@@ -294,7 +294,7 @@ All you need to do is leave off the bounds when defining your type parameters,
 and then add `where` after the parameter list. For longer lists, whitespace can
 be added:
 
-```
+```rust
 use std::fmt::Debug;
 
 fn bar<T, K>(x: T, y: K)
@@ -311,7 +311,7 @@ This flexibility can add clarity in complex situations.
 
 `where` is also more powerful than the simpler syntax. For example:
 
-```
+```rust
 trait ConvertTo<Output> {
     fn convert(&self) -> Output;
 }

src/doc/trpl/vectors.md

@@ -16,7 +16,7 @@ this is just convention.)
 
 There’s an alternate form of `vec!` for repeating an initial value:
 
-```
+```rust
 let v = vec![0; 10]; // ten zeroes
 ```
 

src/doc/trpl/while-loops.md

@@ -2,7 +2,7 @@
 
 Rust also has a `while` loop. It looks like this:
 
-```{rust}
+```rust
 let mut x = 5; // mut x: i32
 let mut done = false; // mut done: bool