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rustc_feature::Features: explain what that 'Option<Symbol>' is about

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Ralf Jung
2024-10-24 08:15:28 +02:00
parent 55b7f8e800
commit 282f291b7d
1 changed files with 6 additions and 0 deletions
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6
compiler/rustc_feature/src/unstable.rs
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@@ -44,6 +44,8 @@ pub struct Features {
} }
impl Features { impl Features {
/// `since` should be set for stable features that are nevertheless enabled with a `#[feature]`
/// attribute, indicating since when they are stable.
pub fn set_enabled_lang_feature(&mut self, name: Symbol, span: Span, since: Option<Symbol>) { pub fn set_enabled_lang_feature(&mut self, name: Symbol, span: Span, since: Option<Symbol>) {
self.enabled_lang_features.push((name, span, since)); self.enabled_lang_features.push((name, span, since));
self.enabled_features.insert(name); self.enabled_features.insert(name);
@@ -54,6 +56,10 @@ impl Features {
self.enabled_features.insert(name); self.enabled_features.insert(name);
} }
/// Returns a list of triples with:
/// - feature gate name
/// - the span of the `#[feature]` attribute
/// - (for already stable features) the version since which it is stable
pub fn enabled_lang_features(&self) -> &Vec<(Symbol, Span, Option<Symbol>)> { pub fn enabled_lang_features(&self) -> &Vec<(Symbol, Span, Option<Symbol>)> {
&self.enabled_lang_features &self.enabled_lang_features
} }