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// Copyright 2018 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.
#![feature(decl_macro)]
macro modern($a: ident) {
struct Modern {
a: u8,
$a: u8, // OK
}
}
macro_rules! legacy {
($a: ident) => {
struct Legacy {
a: u8,
$a: u8, //~ ERROR field `a` is already declared
}
}
}
modern!(a);
legacy!(a);
fn main() {}
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