fix some unused pattern binding warnings

src/libsyntax/parse/classify.rs

@@ -31,7 +31,7 @@ fn stmt_ends_with_semi(stmt: ast::stmt) -> bool {
       ast::stmt_expr(e, _) => {
         return expr_requires_semi_to_be_stmt(e);
       }
-      ast::stmt_semi(e, _) => {
+      ast::stmt_semi(*) => {
         return false;
       }
     }