syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"\"{file_name}:{lo_line}:{lo_col}{}\","}]}
source_snippet:             "{file_name}:{lo_line}:{lo_col}{}",
context_before:         format!(
context_after:             if let FileNameDisplayPreference::Short = filename_display_pref {