1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20

// The compiler code necessary to support the compile_error! extension.

use rustc_ast::tokenstream::TokenStream;
use rustc_expand::base::{self, *};
use rustc_span::Span;

pub fn expand_compile_error<'cx>(
    cx: &'cx mut ExtCtxt<'_>,
    sp: Span,
    tts: TokenStream,
) -> Box<dyn base::MacResult + 'cx> {
    let var = match get_single_str_from_tts(cx, sp, tts, "compile_error!") {
        None => return DummyResult::any(sp),
        Some(v) => v,
    };

    cx.span_err(sp, &var);

    DummyResult::any(sp)
}