thiserror

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• 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
• 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.
• serde A generic serialization/deserialization framework
• unicode-ident Determine whether characters have the XID_Start or XID_Continue properties according to Unicode Standard Annex #31