syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:             // FIXME(return_type_notation): We only support lifetime params for now.
context_before:             && let generics = self.tcx().generics_of(fn_def_id)
context_after:             && generics.own_params.iter().all(|param| matches!(param.kind, ty::GenericParamDefKind::Lifetime))