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If you believe this is docs.rs' fault, open an issue.
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rustc-ap-rustc_feature-727.0.0
Feature gates
This crate declares the set of past and present unstable features in the compiler.
Feature gate checking itself is done in librustc_ast_passes/feature_gate.rs
at the moment.
Features are enabled in programs via the crate-level attributes of
#![feature(...)]
with a comma-separated list of features.
For the purpose of future feature-tracking, once a feature gate is added,
even if it is stabilized or removed, do not remove it. Instead, move the
symbol to the accepted
or removed
modules respectively.