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Avoid returning original macro if expansion fails.
Closes rust-lang#11692. Instead of returning the original expression, a dummy expression (with identical span) is returned. This prevents infinite loops of failed expansions as well as odd double error messages in certain situations.
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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. | ||
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fn main() { | ||
print!(test!()); | ||
//~^ ERROR: macro undefined: 'test' | ||
//~^^ ERROR: format argument must be a string literal | ||
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concat!(test!()); | ||
//~^ ERROR: macro undefined: 'test' | ||
//~^^ ERROR: expected a literal | ||
} |
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r+, thanks!