syntax_data: {"ast_node_type":"variable","tokens":[{"end":62,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let data = DefPathData::AnonAssocTy(def_name);
context_before:                 let def_name = tcx.item_name(fn_def_id.to_def_id());
context_after:                 let mut visitor = RPITVisitor { tcx, synthetics: vec![], data, disambiguator };