rustc-ap-rustc_feature 703.0.0

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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/ 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.