1 // The compiler code necessary to support the compile_error! extension.
3 use syntax::ext::base::{self, *};
5 use syntax::tokenstream;
7 pub fn expand_compile_error<'cx>(cx: &'cx mut ExtCtxt<'_>,
9 tts: &[tokenstream::TokenTree])
10 -> Box<dyn base::MacResult + 'cx> {
11 let var = match get_single_str_from_tts(cx, sp, tts, "compile_error!") {
12 None => return DummyResult::any(sp),
16 cx.span_err(sp, &var);