syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"opt_span_bug_fmt(None::<Span>,"}]}
source_snippet:     opt_span_bug_fmt(None::<Span>, args, Location::caller());
context_before: pub fn bug_fmt(args: fmt::Arguments<'_>) -> ! {
context_after: }