syntax_data: {"ast_node_type":"other","tokens":[{"end":89,"kind":"keyword","start":0,"text":"Self::set_field(&mut"}]}
source_snippet:                     Self::set_field(&mut ret.basename_and_suffix, tcx, name, &attr, |s| {
context_before:                 Some(name @ sym::borrowck_graphviz_postflow) => {
context_after:                         let path = PathBuf::from(s.to_string());