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.
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either • 1.13.0The enum `Either` with variants `Left` and `Right` is a general purpose sum type with two cases.
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getrandom • 0.2.15A small cross-platform library for retrieving random data from system source
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.