1 // Copyright 2012-2017 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 // The compiler code necessary to support the compile_error! extension.
13 use syntax::ext::base::*;
14 use syntax::ext::base;
16 use syntax::tokenstream;
18 pub fn expand_compile_error<'cx>(cx: &'cx mut ExtCtxt,
20 tts: &[tokenstream::TokenTree])
21 -> Box<base::MacResult + 'cx> {
22 let var = match get_single_str_from_tts(cx, sp, tts, "compile_error!") {
23 None => return DummyResult::expr(sp),
27 cx.span_err(sp, &var);