rust/src/test/run-pass/macro-deep_expansion.rs

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// 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! foo2 {
() => {
"foo"
}
}
macro_rules! foo {
() => {
foo2!()
}
}
fn main() {
assert_eq!(concat!(foo!(), "bar"), "foobar")
}