<!-- Copyright 2023 Google LLC SPDX-License-Identifier: CC-BY-4.0 -->

no_std

<table> <tr> <th>

core

</th> <th>

alloc

</th> <th>

std

</th> </tr> <tr valign="top"> <td>

• Slices, &str, CStr
• NonZeroU8...
• Option, Result
• Display, Debug, write!...
• Iterator
• Error
• panic!, assert_eq!...
• NonNull and all the usual pointer-related functions
• Future and async/await
• fence, AtomicBool, AtomicPtr, AtomicU32...
• Duration

</td> <td>

• Box, Cow, Arc, Rc
• Vec, BinaryHeap, BtreeMap, LinkedList, VecDeque
• String, CString, format!

</td> <td>

• HashMap
• Mutex, Condvar, Barrier, Once, RwLock, mpsc
• File and the rest of fs
• println!, Read, Write, Stdin, Stdout and the rest of io
• Path, OsString
• net
• Command, Child, ExitCode
• spawn, sleep and the rest of thread
• SystemTime, Instant

</td> </tr> </table> <details>

• HashMap depends on RNG.
• std re-exports the contents of both core and alloc.

</details>