diff options
Diffstat (limited to 'src/libsyntax/feature_gate.rs')
| -rw-r--r-- | src/libsyntax/feature_gate.rs | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs index 058df1d5169..45d82bc7af3 100644 --- a/src/libsyntax/feature_gate.rs +++ b/src/libsyntax/feature_gate.rs @@ -62,6 +62,7 @@ macro_rules! declare_features { &[$((stringify!($feature), $ver, $issue, set!($feature))),+]; /// A set of features to be used by later passes. + #[derive(Clone)] pub struct Features { /// `#![feature]` attrs for stable language features, for error reporting pub declared_stable_lang_features: Vec<(Symbol, Span)>, @@ -78,6 +79,12 @@ macro_rules! declare_features { $($feature: false),+ } } + + pub fn walk_feature_fields<F>(&self, mut f: F) + where F: FnMut(&str, bool) + { + $(f(stringify!($feature), self.$feature);)+ + } } }; |