{"ast_node_type":"other","tokens":[{"end":41,"kind":"keyword","start":0,"text":"GenericArg::Const(_)"}]}
                GenericArg::Const(_) => {
                GenericArg::Type(_) => GenericArg::Type(self.mk_ty(attr_span, TyKind::Err(guar))),
                    let error_expr = self.mk_expr(attr_span, ExprKind::Err(guar));