rust/src/test/run-pass/issue-15221.rs

// Copyright 2014 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.

macro_rules! inner {
    ($e:pat ) => ($e)
}

macro_rules! outer {
    ($e:pat ) => (inner!($e))
}

fn main() {
    let outer!(g1) = 13i;
    g1;
}