build-context • 0.1.4Make build environment/target information available as constants in normal libraries and binaries.
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0
cfg-if • 1.0.4A 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 • 1.0.107A substitute implementation of the compiler's `proc_macro` API to decouple token-based libraries from the procedural macro use case.