hashbrown

A Rust port of Google's SwissTable hash map

$cargo add hashbrown

Official docs outline

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syn Parser for Rust source code
getrandom A small cross-platform library for retrieving random data from system source
bitflags A macro to generate structures which behave like bitflags.
rand_core Core random number generator traits and tools for implementation.
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
indexmap A hash table with consistent order and fast iteration.
thiserror-impl Implementation detail of the `thiserror` crate