syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"(ty::Binder<'tcx,"}]}
source_snippet:             (ty::Binder<'tcx, (&'tcx ty::List<Ty<'tcx>>, Ty<'tcx>)>, bool),
context_before:         fn_traits: &mut FxIndexMap<
context_after:             OpaqueFnEntry<'tcx>,