fn check_expr(this: &mut Liveness, expr: &Expr) {
match expr.node {
- hir::ExprAssign(ref l, ref r) => {
+ hir::ExprAssign(ref l, _) => {
this.check_lvalue(&**l);
- this.visit_expr(&**r);
visit::walk_expr(this, expr);
}
--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#![deny(unused_variables)]
+
+fn f(_: i32) {}
+
+fn main() {
+ let mut v = 0;
+ f(v);
+ v = match 0 { a => 0 }; //~ ERROR: unused variable: `a`
+ f(v);
+}