indexmap

A hash table with consistent order and fast iteration.

$cargo add indexmap

Official docs outline

Extra Credit builds an outline of indexmap's docs the first time your work uses it. Until then, start at the official documentation.

rand Random number generators and other randomness functionality.
libc Raw FFI bindings to platform libraries like libc.
quote Quasi-quoting macro quote!(...)
proc-macro2 A substitute implementation of the compiler's `proc_macro` API to decouple token-based libraries from the procedural macro use case.
base64 encodes and decodes base64 as bytes or utf8
windows-sys Rust for Windows
thiserror-impl Implementation detail of the `thiserror` crate
thiserror derive(Error)
itertools Extra iterator adaptors, iterator methods, free functions, and macros.
cfg-if A macro to ergonomically define an item depending on a large number of #[cfg] parameters. Structured like an if-else chain, the first matchi
memchr Provides extremely fast (uses SIMD on x86_64, aarch64 and wasm32) routines for 1, 2 or 3 byte search and single substring search.
regex-syntax A regular expression parser.