syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"opt_span_bug_fmt(Some(span),"}]}
source_snippet:     opt_span_bug_fmt(Some(span), args, Location::caller());
context_before: pub fn span_bug_fmt<S: Into<MultiSpan>>(span: S, args: fmt::Arguments<'_>) -> ! {
context_after: }