- self.check_extern(header.ext);
-
- if let (ast::Const::Yes(_), ast::Extern::Implicit)
- | (ast::Const::Yes(_), ast::Extern::Explicit(_)) = (header.constness, header.ext)
- {
- gate_feature_post!(
- &self,
- const_extern_fn,
- span,
- "`const extern fn` definitions are unstable"
- );
- }