src/libsyntax_ext/compile_error.rs

   1 // The compiler code necessary to support the compile_error! extension.
   2
   3 use syntax::ext::base::{self, *};
   4 use syntax_pos::Span;
   5 use syntax::tokenstream::TokenStream;
   6
   7 pub fn expand_compile_error<'cx>(cx: &'cx mut ExtCtxt<'_>,
   8                               sp: Span,
   9                               tts: TokenStream)
  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),
  13         Some(v) => v,
  14     };
  15
  16     cx.span_err(sp, &var);
  17
  18     DummyResult::any(sp)
  19 }