syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"label.push_span_label(span,"}]}
source_snippet:                 label.push_span_label(span, label_msg);
context_before:                 let mut label = MultiSpan::from(span);
context_after:                 diag.span_note(label, note_msg);