Function rustc_builtin_macros::util::get_single_str_spanned_from_tts

pub(crate) fn get_single_str_spanned_from_tts(
    cx: &mut ExtCtxt<'_>,
    span: Span,
    tts: TokenStream,
    name: &str,
) -> ExpandResult<Result<(Symbol, Span), ErrorGuaranteed>, ()>