syntax_data: {"ast_node_type":"function","tokens":[{"end":53,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn fold_ty(&mut self, ty: Ty<'tcx>) -> Ty<'tcx> {
context_after:         if !ty.has_type_flags(ty::TypeFlags::HAS_TY_FREE_ALIAS) {