src/libsyntax_ext/compile_error.rs

   1 // The compiler code necessary to support the compile_error! extension.
   2
   3 use syntax::ext::base::*;
   4 use syntax::ext::base;
   5 use syntax_pos::Span;
   6 use syntax::tokenstream;
   7
   8 pub fn expand_compile_error<'cx>(cx: &'cx mut ExtCtxt,
   9                               sp: Span,
  10                               tts: &[tokenstream::TokenTree])
  11                               -> Box<dyn base::MacResult + 'cx> {
  12     let var = match get_single_str_from_tts(cx, sp, tts, "compile_error!") {
  13         None => return DummyResult::any(sp),
  14         Some(v) => v,
  15     };
  16
  17     cx.span_err(sp, &var);
  18
  19     DummyResult::any(sp)
  20 }