rust/src/test/compile-fail/issue-3038.rs

// Copyright 2012 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.

enum f { g(int, int) }

enum h { i(j, k) }

enum j { l(int, int) }
enum k { m(int, int) }

fn main()
{

    let _z = match g(1, 2) {
      g(x, x) => { log(debug, x + x); }
      //~^ ERROR Identifier x is bound more than once in the same pattern
    };

    let _z = match i(l(1, 2), m(3, 4)) {
      i(l(x, _), m(_, x))  //~ ERROR Identifier x is bound more than once in the same pattern
        => { log(error, x + x); }
    };

    let _z = match (1, 2) {
        (x, x) => { x } //~ ERROR Identifier x is bound more than once in the same pattern
    };

}