syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"primary_def_id:"}]}
source_snippet:     primary_def_id: Option<DefId>,
context_before:     expanded_cache: FxHashMap<(DefId, GenericArgsRef<'tcx>), Ty<'tcx>>,
context_after:     found_recursion: bool,