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</pre><pre class="rust ">
<span class="comment">// Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! # The Rust Standard Library</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The Rust Standard Library is the foundation of portable Rust software, a</span>
<span class="doccomment">//! set of minimal and battle-tested shared abstractions for the [broader Rust</span>
<span class="doccomment">//! ecosystem][crates.io]. It offers core types, like [`Vec<T>`] and</span>
<span class="doccomment">//! [`Option<T>`], library-defined [operations on language</span>
<span class="doccomment">//! primitives](#primitives), [standard macros](#macros), [I/O] and</span>
<span class="doccomment">//! [multithreading], among [many other things][other].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! `std` is available to all Rust crates by default, just as if each one</span>
<span class="doccomment">//! contained an `extern crate std;` import at the [crate root]. Therefore the</span>
<span class="doccomment">//! standard library can be accessed in [`use`] statements through the path</span>
<span class="doccomment">//! `std`, as in [`use std::env`], or in expressions through the absolute path</span>
<span class="doccomment">//! `::std`, as in [`::std::env::args`].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # How to read this documentation</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! If you already know the name of what you are looking for, the fastest way to</span>
<span class="doccomment">//! find it is to use the <a href="#" onclick="focusSearchBar();">search</span>
<span class="doccomment">//! bar</a> at the top of the page.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Otherwise, you may want to jump to one of these useful sections:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * [`std::*` modules](#modules)</span>
<span class="doccomment">//! * [Primitive types](#primitives)</span>
<span class="doccomment">//! * [Standard macros](#macros)</span>
<span class="doccomment">//! * [The Rust Prelude](prelude/index.html)</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! If this is your first time, the documentation for the standard library is</span>
<span class="doccomment">//! written to be casually perused. Clicking on interesting things should</span>
<span class="doccomment">//! generally lead you to interesting places. Still, there are important bits</span>
<span class="doccomment">//! you don't want to miss, so read on for a tour of the standard library and</span>
<span class="doccomment">//! its documentation!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Once you are familiar with the contents of the standard library you may</span>
<span class="doccomment">//! begin to find the verbosity of the prose distracting. At this stage in your</span>
<span class="doccomment">//! development you may want to press the `[-]` button near the top of the</span>
<span class="doccomment">//! page to collapse it into a more skimmable view.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! While you are looking at that `[-]` button also notice the `[src]`</span>
<span class="doccomment">//! button. Rust's API documentation comes with the source code and you are</span>
<span class="doccomment">//! encouraged to read it. The standard library source is generally high</span>
<span class="doccomment">//! quality and a peek behind the curtains is often enlightening.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # What is in the standard library documentation?</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! First of all, The Rust Standard Library is divided into a number of focused</span>
<span class="doccomment">//! modules, [all listed further down this page](#modules). These modules are</span>
<span class="doccomment">//! the bedrock upon which all of Rust is forged, and they have mighty names</span>
<span class="doccomment">//! like [`std::slice`] and [`std::cmp`]. Modules' documentation typically</span>
<span class="doccomment">//! includes an overview of the module along with examples, and are a smart</span>
<span class="doccomment">//! place to start familiarizing yourself with the library.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Second, implicit methods on [primitive types] are documented here. This can</span>
<span class="doccomment">//! be a source of confusion for two reasons:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! 1. While primitives are implemented by the compiler, the standard library</span>
<span class="doccomment">//! implements methods directly on the primitive types (and it is the only</span>
<span class="doccomment">//! library that does so), which are [documented in the section on</span>
<span class="doccomment">//! primitives](#primitives).</span>
<span class="doccomment">//! 2. The standard library exports many modules *with the same name as</span>
<span class="doccomment">//! primitive types*. These define additional items related to the primitive</span>
<span class="doccomment">//! type, but not the all-important methods.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! So for example there is a [page for the primitive type</span>
<span class="doccomment">//! `i32`](primitive.i32.html) that lists all the methods that can be called on</span>
<span class="doccomment">//! 32-bit integers (very useful), and there is a [page for the module</span>
<span class="doccomment">//! `std::i32`](i32/index.html) that documents the constant values [`MIN`] and</span>
<span class="doccomment">//! [`MAX`](i32/constant.MAX.html) (rarely useful).</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Note the documentation for the primitives [`str`] and [`[T]`][slice] (also</span>
<span class="doccomment">//! called 'slice'). Many method calls on [`String`] and [`Vec<T>`] are actually</span>
<span class="doccomment">//! calls to methods on [`str`] and [`[T]`][slice] respectively, via [deref</span>
<span class="doccomment">//! coercions][deref-coercions].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Third, the standard library defines [The Rust Prelude], a small collection</span>
<span class="doccomment">//! of items - mostly traits - that are imported into every module of every</span>
<span class="doccomment">//! crate. The traits in the prelude are pervasive, making the prelude</span>
<span class="doccomment">//! documentation a good entry point to learning about the library.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! And finally, the standard library exports a number of standard macros, and</span>
<span class="doccomment">//! [lists them on this page](#macros) (technically, not all of the standard</span>
<span class="doccomment">//! macros are defined by the standard library - some are defined by the</span>
<span class="doccomment">//! compiler - but they are documented here the same). Like the prelude, the</span>
<span class="doccomment">//! standard macros are imported by default into all crates.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Contributing changes to the documentation</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Check out the rust contribution guidelines [here](</span>
<span class="doccomment">//! https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md).</span>
<span class="doccomment">//! The source for this documentation can be found on [Github](https://github.com/rust-lang).</span>
<span class="doccomment">//! To contribute changes, make sure you read the guidelines first, then submit</span>
<span class="doccomment">//! pull-requests for your suggested changes.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Contributions are appreciated! If you see a part of the docs that can be</span>
<span class="doccomment">//! improved, submit a PR, or chat with us first on irc.mozilla.org #rust-docs.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # A Tour of The Rust Standard Library</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The rest of this crate documentation is dedicated to pointing out notable</span>
<span class="doccomment">//! features of The Rust Standard Library.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Containers and collections</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The [`option`] and [`result`] modules define optional and error-handling</span>
<span class="doccomment">//! types, [`Option<T>`] and [`Result<T, E>`]. The [`iter`] module defines</span>
<span class="doccomment">//! Rust's iterator trait, [`Iterator`], which works with the [`for`] loop to</span>
<span class="doccomment">//! access collections.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The standard library exposes three common ways to deal with contiguous</span>
<span class="doccomment">//! regions of memory:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * [`Vec<T>`] - A heap-allocated *vector* that is resizable at runtime.</span>
<span class="doccomment">//! * [`[T; n]`][array] - An inline *array* with a fixed size at compile time.</span>
<span class="doccomment">//! * [`[T]`][slice] - A dynamically sized *slice* into any other kind of contiguous</span>
<span class="doccomment">//! storage, whether heap-allocated or not.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Slices can only be handled through some kind of *pointer*, and as such come</span>
<span class="doccomment">//! in many flavors such as:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `&[T]` - *shared slice*</span>
<span class="doccomment">//! * `&mut [T]` - *mutable slice*</span>
<span class="doccomment">//! * [`Box<[T]>`][owned slice] - *owned slice*</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`str`], a UTF-8 string slice, is a primitive type, and the standard library</span>
<span class="doccomment">//! defines many methods for it. Rust [`str`]s are typically accessed as</span>
<span class="doccomment">//! immutable references: `&str`. Use the owned [`String`] for building and</span>
<span class="doccomment">//! mutating strings.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! For converting to strings use the [`format!`] macro, and for converting from</span>
<span class="doccomment">//! strings use the [`FromStr`] trait.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Data may be shared by placing it in a reference-counted box or the [`Rc`]</span>
<span class="doccomment">//! type, and if further contained in a [`Cell`] or [`RefCell`], may be mutated</span>
<span class="doccomment">//! as well as shared. Likewise, in a concurrent setting it is common to pair an</span>
<span class="doccomment">//! atomically-reference-counted box, [`Arc`], with a [`Mutex`] to get the same</span>
<span class="doccomment">//! effect.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The [`collections`] module defines maps, sets, linked lists and other</span>
<span class="doccomment">//! typical collection types, including the common [`HashMap<K, V>`].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Platform abstractions and I/O</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Besides basic data types, the standard library is largely concerned with</span>
<span class="doccomment">//! abstracting over differences in common platforms, most notably Windows and</span>
<span class="doccomment">//! Unix derivatives.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Common types of I/O, including [files], [TCP], [UDP], are defined in the</span>
<span class="doccomment">//! [`io`], [`fs`], and [`net`] modules.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The [`thread`] module contains Rust's threading abstractions. [`sync`]</span>
<span class="doccomment">//! contains further primitive shared memory types, including [`atomic`] and</span>
<span class="doccomment">//! [`mpsc`], which contains the channel types for message passing.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [I/O]: io/index.html</span>
<span class="doccomment">//! [`MIN`]: i32/constant.MIN.html</span>
<span class="doccomment">//! [TCP]: net/struct.TcpStream.html</span>
<span class="doccomment">//! [The Rust Prelude]: prelude/index.html</span>
<span class="doccomment">//! [UDP]: net/struct.UdpSocket.html</span>
<span class="doccomment">//! [`::std::env::args`]: env/fn.args.html</span>
<span class="doccomment">//! [`Arc`]: sync/struct.Arc.html</span>
<span class="doccomment">//! [owned slice]: boxed/index.html</span>
<span class="doccomment">//! [`Cell`]: cell/struct.Cell.html</span>
<span class="doccomment">//! [`FromStr`]: str/trait.FromStr.html</span>
<span class="doccomment">//! [`HashMap<K, V>`]: collections/struct.HashMap.html</span>
<span class="doccomment">//! [`Iterator`]: iter/trait.Iterator.html</span>
<span class="doccomment">//! [`Mutex`]: sync/struct.Mutex.html</span>
<span class="doccomment">//! [`Option<T>`]: option/enum.Option.html</span>
<span class="doccomment">//! [`Rc`]: rc/index.html</span>
<span class="doccomment">//! [`RefCell`]: cell/struct.RefCell.html</span>
<span class="doccomment">//! [`Result<T, E>`]: result/enum.Result.html</span>
<span class="doccomment">//! [`String`]: string/struct.String.html</span>
<span class="doccomment">//! [`Vec<T>`]: vec/index.html</span>
<span class="doccomment">//! [array]: primitive.array.html</span>
<span class="doccomment">//! [slice]: primitive.slice.html</span>
<span class="doccomment">//! [`atomic`]: sync/atomic/index.html</span>
<span class="doccomment">//! [`collections`]: collections/index.html</span>
<span class="doccomment">//! [`for`]: ../book/first-edition/loops.html#for</span>
<span class="doccomment">//! [`format!`]: macro.format.html</span>
<span class="doccomment">//! [`fs`]: fs/index.html</span>
<span class="doccomment">//! [`io`]: io/index.html</span>
<span class="doccomment">//! [`iter`]: iter/index.html</span>
<span class="doccomment">//! [`mpsc`]: sync/mpsc/index.html</span>
<span class="doccomment">//! [`net`]: net/index.html</span>
<span class="doccomment">//! [`option`]: option/index.html</span>
<span class="doccomment">//! [`result`]: result/index.html</span>
<span class="doccomment">//! [`std::cmp`]: cmp/index.html</span>
<span class="doccomment">//! [`std::slice`]: slice/index.html</span>
<span class="doccomment">//! [`str`]: primitive.str.html</span>
<span class="doccomment">//! [`sync`]: sync/index.html</span>
<span class="doccomment">//! [`thread`]: thread/index.html</span>
<span class="doccomment">//! [`use std::env`]: env/index.html</span>
<span class="doccomment">//! [`use`]: ../book/first-edition/crates-and-modules.html#importing-modules-with-use</span>
<span class="doccomment">//! [crate root]: ../book/first-edition/crates-and-modules.html#basic-terminology-crates-and-modules</span>
<span class="doccomment">//! [crates.io]: https://crates.io</span>
<span class="doccomment">//! [deref-coercions]: ../book/second-edition/ch15-02-deref.html#implicit-deref-coercions-with-functions-and-methods</span>
<span class="doccomment">//! [files]: fs/struct.File.html</span>
<span class="doccomment">//! [multithreading]: thread/index.html</span>
<span class="doccomment">//! [other]: #what-is-in-the-standard-library-documentation</span>
<span class="doccomment">//! [primitive types]: ../book/first-edition/primitive-types.html</span>
<span class="attribute">#![<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="attribute">#![<span class="ident">doc</span>(<span class="ident">html_logo_url</span> <span class="op">=</span> <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png"</span>,
<span class="ident">html_favicon_url</span> <span class="op">=</span> <span class="string">"https://doc.rust-lang.org/favicon.ico"</span>,
<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://doc.rust-lang.org/nightly/"</span>,
<span class="ident">html_playground_url</span> <span class="op">=</span> <span class="string">"https://play.rust-lang.org/"</span>,
<span class="ident">issue_tracker_base_url</span> <span class="op">=</span> <span class="string">"https://github.com/rust-lang/rust/issues/"</span>,
<span class="ident">test</span>(<span class="ident">no_crate_inject</span>, <span class="ident">attr</span>(<span class="ident">deny</span>(<span class="ident">warnings</span>))),
<span class="ident">test</span>(<span class="ident">attr</span>(<span class="ident">allow</span>(<span class="ident">dead_code</span>, <span class="ident">deprecated</span>, <span class="ident">unused_variables</span>, <span class="ident">unused_mut</span>))))]</span>
<span class="comment">// Don't link to std. We are std.</span>
<span class="attribute">#![<span class="ident">no_std</span>]</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="comment">// Tell the compiler to link to either panic_abort or panic_unwind</span>
<span class="attribute">#![<span class="ident">needs_panic_runtime</span>]</span>
<span class="comment">// std may use features in a platform-specific way</span>
<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">unused_features</span>)]</span>
<span class="comment">// std is implemented with unstable features, many of which are internal</span>
<span class="comment">// compiler details that will never be stable</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">alloc</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">allocator_api</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">alloc_system</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">allocator_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">allow_internal_unsafe</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">allow_internal_unstable</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">align_offset</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">arbitrary_self_types</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">array_error_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">ascii_ctype</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">asm</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">attr_literals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">box_syntax</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">cfg_target_has_atomic</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">cfg_target_thread_local</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">cfg_target_vendor</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">char_error_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">char_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">collections_range</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">compiler_builtins_lib</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">const_fn</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">core_intrinsics</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">dropck_eyepatch</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">exact_size_is_empty</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">external_doc</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">fs_read_write</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">fixed_size_array</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">float_from_str_radix</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">fn_traits</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">fnbox</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">futures_api</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">hashmap_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">int_error_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">integer_atomics</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">into_cow</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">lang_items</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">libc</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">link_args</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">linkage</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">macro_vis_matcher</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">needs_panic_runtime</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">never_type</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">exhaustive_patterns</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">num_bits_bytes</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">old_wrapping</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">on_unimplemented</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">oom</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">optin_builtin_traits</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">panic_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">panic_unwind</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">peek</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">pin</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">placement_new_protocol</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">prelude_import</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">ptr_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">rand</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">raw</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">rustc_attrs</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">std_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">stdsimd</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">shrink_to</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">slice_bytes</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">slice_concat_ext</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">slice_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">slice_patterns</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">staged_api</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">stmt_expr_attributes</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">str_char</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">str_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">str_utf16</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">test</span>, <span class="ident">rustc_private</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">thread_local</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">toowned_clone_into</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">try_from</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">try_reserve</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">unboxed_closures</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">untagged_unions</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">unwind_attributes</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">use_extern_macros</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">vec_push_all</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_cfg</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_masked</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_spotlight</span>)]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">test</span>, <span class="ident">feature</span>(<span class="ident">update_panic_count</span>))]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">windows</span>, <span class="ident">feature</span>(<span class="ident">used</span>))]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_alias</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">doc_keyword</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">float_internals</span>)]</span>
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">panic_info_message</span>)]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">stage0</span>), <span class="ident">feature</span>(<span class="ident">panic_implementation</span>))]</span>
<span class="attribute">#![<span class="ident">default_lib_allocator</span>]</span>
<span class="comment">// Always use alloc_system during stage0 since we don't know if the alloc_*</span>
<span class="comment">// crate the stage0 compiler will pick by default is enabled (e.g.</span>
<span class="comment">// if the user has disabled jemalloc in `./configure`).</span>
<span class="comment">// `force_alloc_system` is *only* intended as a workaround for local rebuilds</span>
<span class="comment">// with a rustc without jemalloc.</span>
<span class="comment">// FIXME(#44236) shouldn't need MSVC logic</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"msvc"</span>), <span class="ident">stage0</span>, <span class="ident">not</span>(<span class="ident">test</span>)), <span class="ident">feature</span>(<span class="ident">global_allocator</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">target_env</span> <span class="op">=</span> <span class="string">"msvc"</span>),
<span class="ident">any</span>(<span class="ident">all</span>(<span class="ident">stage0</span>, <span class="ident">not</span>(<span class="ident">test</span>)), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"force_alloc_system"</span>)))]</span>
<span class="attribute">#[<span class="ident">global_allocator</span>]</span>
<span class="kw">static</span> <span class="ident">ALLOC</span>: <span class="ident">alloc_system</span>::<span class="ident">System</span> <span class="op">=</span> <span class="ident">alloc_system</span>::<span class="ident">System</span>;
<span class="comment">// Explicitly import the prelude. The compiler uses this same unstable attribute</span>
<span class="comment">// to import the prelude implicitly when building crates that depend on std.</span>
<span class="attribute">#[<span class="ident">prelude_import</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused</span>)]</span>
<span class="kw">use</span> <span class="ident">prelude</span>::<span class="ident">v1</span>::<span class="kw-2">*</span>;
<span class="comment">// Access to Bencher, etc.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">test</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">rand</span>;
<span class="comment">// Re-export a few macros from core</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::{<span class="ident">assert_eq</span>, <span class="ident">assert_ne</span>, <span class="ident">debug_assert</span>, <span class="ident">debug_assert_eq</span>, <span class="ident">debug_assert_ne</span>};
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::{<span class="ident">unreachable</span>, <span class="ident">unimplemented</span>, <span class="ident">write</span>, <span class="ident">writeln</span>, <span class="ident">try</span>};
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_imports</span>)]</span> <span class="comment">// macros from `alloc` are not used on all platforms</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">alloc</span> <span class="kw">as</span> <span class="ident">alloc_crate</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">alloc_system</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">masked</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">libc</span>;
<span class="comment">// We always need an unwinder currently for backtraces</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">masked</span>)]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">unused_extern_crates</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">unwind</span>;
<span class="comment">// During testing, this crate is not actually the "real" std library, but rather</span>
<span class="comment">// it links to the real std library, which was compiled from this same source</span>
<span class="comment">// code. So any lang items std defines are conditionally excluded (or else they</span>
<span class="comment">// would generate duplicate lang item errors), and any globals it defines are</span>
<span class="comment">// _not_ the globals used by "real" std. So this import, defined only during</span>
<span class="comment">// testing gives test-std access to real-std lang items and globals. See #2912</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span> <span class="kw">as</span> <span class="ident">realstd</span>;
<span class="comment">// The standard macros that are not built-in to the compiler.</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">macros</span>;
<span class="comment">// The Rust prelude</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">prelude</span>;
<span class="comment">// Public module declarations and re-exports</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">any</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">cell</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">clone</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">cmp</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">convert</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">default</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">hash</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">intrinsics</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">iter</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">marker</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">mem</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ops</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">ptr</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">raw</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">result</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">option</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">isize</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">i8</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">i16</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">i32</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">i64</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"i128"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">i128</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">usize</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">u8</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">u16</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">u32</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">u64</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">boxed</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">rc</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">borrow</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">fmt</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">format</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">slice</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">str</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">string</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">vec</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">char</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"i128"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.26.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">u128</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"core_hint"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">hint</span>;
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"futures_api"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"futures in libcore are unstable"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"50547"</span>)]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">task</span> {
<span class="doccomment">//! Types and Traits for working with asynchronous tasks.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">task</span>::<span class="kw-2">*</span>;
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">inline</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">alloc_crate</span>::<span class="ident">task</span>::<span class="kw-2">*</span>;
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"futures_api"</span>,
<span class="ident">reason</span> <span class="op">=</span> <span class="string">"futures in libcore are unstable"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"50547"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">future</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">f32</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">f64</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">thread</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ascii</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">collections</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">env</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">error</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">ffi</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">fs</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">io</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">net</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">num</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">os</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">panic</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">path</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">process</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">sync</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">time</span>;
<span class="comment">// Platform-abstraction modules</span>
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">sys_common</span>;
<span class="kw">mod</span> <span class="ident">sys</span>;
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">alloc</span>;
<span class="comment">// Private support modules</span>
<span class="kw">mod</span> <span class="ident">panicking</span>;
<span class="kw">mod</span> <span class="ident">memchr</span>;
<span class="comment">// The runtime entry point and a few unstable public functions used by the</span>
<span class="comment">// compiler</span>
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">rt</span>;
<span class="comment">// Pull in the the `stdsimd` crate directly into libstd. This is the same as</span>
<span class="comment">// libcore's arch/simd modules where the source of truth here is in a different</span>
<span class="comment">// repository, but we pull things in here manually to get it into libstd.</span>
<span class="comment">//</span>
<span class="comment">// Note that the #[cfg] here is intended to do two things. First it allows us to</span>
<span class="comment">// change the rustc implementation of intrinsics in stage0 by not compiling simd</span>
<span class="comment">// intrinsics in stage0. Next it doesn't compile anything in test mode as</span>
<span class="comment">// stdsimd has tons of its own tests which we don't want to run.</span>
<span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">"../stdsimd/stdsimd/mod.rs"</span>]</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>, <span class="ident">missing_docs</span>, <span class="ident">dead_code</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"48556"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">stage0</span>), <span class="ident">not</span>(<span class="ident">test</span>)))]</span>
<span class="kw">mod</span> <span class="ident">stdsimd</span>;
<span class="comment">// A "fake" module needed by the `stdsimd` module to compile, not actually</span>
<span class="comment">// exported though.</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">stage0</span>))]</span>
<span class="kw">mod</span> <span class="ident">coresimd</span> {
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">arch</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">core</span>::<span class="ident">simd</span>;
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"stdsimd"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"48556"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">stage0</span>), <span class="ident">not</span>(<span class="ident">test</span>)))]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">stdsimd</span>::<span class="ident">simd</span>;
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"simd_arch"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.27.0"</span>)]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">stage0</span>), <span class="ident">not</span>(<span class="ident">test</span>)))]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident">stdsimd</span>::<span class="ident">arch</span>;
<span class="comment">// Include a number of private modules that exist solely to provide</span>
<span class="comment">// the rustdoc documentation for primitive types. Using `include!`</span>
<span class="comment">// because rustdoc only looks for these modules at the crate level.</span>
<span class="macro">include</span><span class="macro">!</span>(<span class="string">"primitive_docs.rs"</span>);
<span class="comment">// Include a number of private modules that exist solely to provide</span>
<span class="comment">// the rustdoc documentation for the existing keywords. Using `include!`</span>
<span class="comment">// because rustdoc only looks for these modules at the crate level.</span>
<span class="macro">include</span><span class="macro">!</span>(<span class="string">"keyword_docs.rs"</span>);
</pre>
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