diff options
Diffstat (limited to 'src/libsyntax')
| -rw-r--r-- | src/libsyntax/feature_gate.rs | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/libsyntax/feature_gate.rs b/src/libsyntax/feature_gate.rs index 6560943a932..1fef382c83a 100644 --- a/src/libsyntax/feature_gate.rs +++ b/src/libsyntax/feature_gate.rs @@ -389,6 +389,9 @@ declare_features! ( // Copy/Clone closures (RFC 2132) (active, clone_closures, "1.22.0", Some(44490)), (active, copy_closures, "1.22.0", Some(44490)), + + // allow `'_` placeholder lifetimes + (active, underscore_lifetimes, "1.22.0", Some(44524)), ); declare_features! ( @@ -1572,6 +1575,14 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> { } visit::walk_lifetime_def(self, lifetime_def) } + + fn visit_lifetime(&mut self, lt: &'a ast::Lifetime) { + if lt.ident.name == "'_" { + gate_feature_post!(&self, underscore_lifetimes, lt.span, + "underscore lifetimes are unstable"); + } + visit::walk_lifetime(self, lt) + } } pub fn get_features(span_handler: &Handler, krate_attrs: &[ast::Attribute]) -> Features { |