| // Copyright 2012-2017 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. |
| |
| // The compiler code necessary to support the compile_error! extension. |
| |
| use syntax::ext::base::*; |
| use syntax::ext::base; |
| use syntax_pos::Span; |
| use syntax::tokenstream; |
| |
| pub fn expand_compile_error<'cx>(cx: &'cx mut ExtCtxt, |
| sp: Span, |
| tts: &[tokenstream::TokenTree]) |
| -> Box<dyn base::MacResult + 'cx> { |
| let var = match get_single_str_from_tts(cx, sp, tts, "compile_error!") { |
| None => return DummyResult::expr(sp), |
| Some(v) => v, |
| }; |
| |
| cx.span_err(sp, &var); |
| |
| DummyResult::any(sp) |
| } |