{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"self.check_lhs_assignable(lhs,"}]}
        self.check_lhs_assignable(lhs, E0067, op.span, |err| {
            if let Some(lhs_deref_ty) = self.deref_once_mutably_for_diagnostic(lhs_ty) {