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.
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bitflags • 1.3.2A macro to generate structures which behave like bitflags.
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bytecount • 0.3.2count occurrences of a given byte, or the number of UTF-8 code points, in a byte slice, fast
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cfg-if • 1.0.0A macro to ergonomically define an item depending on a large number of #[cfg]
parameters. Structured like an if-else chain, the first matching branch is the
item that gets emitted.
proc-macro2 • 1.0.93A 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.