arrayvec • 0.5.2A vector with fixed capacity, backed by an array (it can be stored on the stack too). Implements fixed capacity ArrayVec and ArrayString.
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.
toml • 0.5.11A 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.