src/test/ui/issue-43250.rs


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// Copyright 2017 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.

fn main() {
    let mut y;
    const C: u32 = 0;
    macro_rules! m {
        ($a:expr) => {
            let $a = 0;
        }
    }
    m!(y);
    //~^ ERROR arbitrary expressions aren't allowed in patterns
    m!(C);
    //~^ ERROR arbitrary expressions aren't allowed in patterns
}