Add lint for unused macros

1 files changed, 6 insertions, 0 deletions

diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index f731c5abdd6..b0253ec3905 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -589,6 +589,7 @@ pub trait Resolver {
                      -> Result<Option<Rc<SyntaxExtension>>, Determinacy>;
     fn resolve_macro(&mut self, scope: Mark, path: &ast::Path, kind: MacroKind, force: bool)
                      -> Result<Rc<SyntaxExtension>, Determinacy>;
+    fn check_unused_macros(&self);
 }
 
 #[derive(Copy, Clone, Debug)]
@@ -618,6 +619,7 @@ impl Resolver for DummyResolver {
                      _force: bool) -> Result<Rc<SyntaxExtension>, Determinacy> {
         Err(Determinacy::Determined)
     }
+    fn check_unused_macros(&self) {}
 }
 
 #[derive(Clone)]
@@ -800,6 +802,10 @@ impl<'a> ExtCtxt<'a> {
     pub fn name_of(&self, st: &str) -> ast::Name {
         Symbol::intern(st)
     }
+
+    pub fn check_unused_macros(&self) {
+        self.resolver.check_unused_macros();
+    }
 }
 
 /// Extract a string literal from the macro expanded version of `expr`,