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.
Re-exports§
pub use accepted::ACCEPTED_LANG_FEATURES;pub use builtin_attrs::AttributeStability;pub use builtin_attrs::BUILTIN_ATTRIBUTE_SET;pub use builtin_attrs::BUILTIN_ATTRIBUTES;pub use builtin_attrs::GatedCfg;pub use builtin_attrs::find_gated_cfg;pub use builtin_attrs::is_builtin_attr_name;pub use removed::REMOVED_LANG_FEATURES;pub use unstable::DEPENDENT_FEATURES;pub use unstable::DependentFeature;pub use unstable::EnabledLangFeature;pub use unstable::EnabledLibFeature;pub use unstable::Features;pub use unstable::INCOMPATIBLE_FEATURES;pub use unstable::TRACK_FEATURE;pub use unstable::UNSTABLE_LANG_FEATURES;pub(crate) use std::num::NonZero;🔒pub(crate) use rustc_span::Symbol;🔒
Modules§
- accepted 🔒
- List of the accepted feature gates.
- builtin_
attrs 🔒 - Built-in attributes and
cfgflag gating. - removed 🔒
- List of the removed feature gates.
- unstable 🔒
- List of the unstable feature gates.