Crate rustc_feature

source
Expand description

§Feature gates

This crate declares the set of past and present unstable features in the compiler. Feature gate checking itself is done in rustc_ast_passes/src/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.

Modules§

  • accepted ðŸ”’
    List of the accepted feature gates.
  • builtin_attrs ðŸ”’
    Built-in attributes and cfg flag gating.
  • removed ðŸ”’
    List of the removed feature gates.
  • unstable ðŸ”’
    List of the unstable feature gates.

Structs§

Enums§

Constants§

  • Formerly unstable features that have now been accepted (stabilized).
  • Attributes that have a special meaning to rustc or rustdoc.
  • Some features are not allowed to be used together at the same time, if the two are present, produce an error.
  • Formerly unstable features that have now been removed.
  • Unstable language features that are being implemented or being considered for acceptance (stabilization) or removal.

Statics§

Functions§

Type Aliases§