syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"Some(sf)"}]}
source_snippet:             Some(sf) => sf.name.display(filename_display_pref).to_string(),
context_before:         let file_name = match source_file {
context_after:             None => return "no-location".to_string(),