proc-macro2 • 1.0.89A substitute implementation of the compiler's `proc_macro` API to decouple token-based libraries from the procedural macro use case.
regex • 1.7.3An implementation of regular expressions for Rust. This implementation uses
finite automata and guarantees linear time matching on all inputs.
toml • 0.4.10A native Rust encoder and decoder of TOML-formatted files and streams. Provides
implementations of the standard Serialize/Deserialize traits for TOML data to
facilitate deserializing and serializing Rust structures.
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version_check • 0.1.5Tiny crate to check the version of the installed/running rustc.