Function rustc_expand::mbe::diagnostics::failed_to_match_macro

pub(super) fn failed_to_match_macro<'cx>(
    cx: &'cx mut ExtCtxt<'_>,
    sp: Span,
    def_span: Span,
    name: Ident,
    arg: TokenStream,
    lhses: &[Vec<MatcherLoc>]
) -> Box<dyn MacResult + 'cx>