ICE with ref pattern on integers

[Manishearth]

fn main() {
    let x = (0,2);
    match x {
        (0, ref y) => { /* use y */}
        (y, 0) => { /* use y */ }
        _ => ()
    }
}

playpen

This causes an ICE at error: internal compiler error: ../src/librustc_trans/_match.rs:944: only string and byte strings supported in compare_values on stable, beta, and nightly.

It goes away if you swap the match arms.

[jonas-schievink]

Duplicate of #33498