Function rustc_expand::base::get_single_str_from_tts

pub fn get_single_str_from_tts(
    cx: &mut ExtCtxt<'_>,
    span: Span,
    tts: TokenStream,
    name: &str
) -> Option<Symbol>

Interpreting tts as a comma-separated sequence of expressions, expect exactly one string literal, or emit an error and return None.