{"ast_node_type":"variable","tokens":[{"end":48,"kind":"keyword","start":0,"text":"if"}]}
            if let ty::Adt(def, _) = ty.kind() {
            let msg = format!("`{ty}` doesn't implement `Copy` or `Clone`");
                err.span_note(self.infcx.tcx.def_span(def.did()), msg);