// Copyright 2013 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.

// Constants (static variables) can be used to match in patterns, but mutable
// statics cannot. This ensures that there's some form of error if this is
// attempted.

static mut a: int = 3;

fn main() {
    // If they can't be matched against, then it's possible to capture the same
    // name as a variable, hence this should be an unreachable pattern situation
    // instead of spitting out a custom error about some identifier collisions
    // (we should allow shadowing)
    match 4 {
        a => {}
        _ => {} //~ ERROR: unreachable pattern
    }
}