{"ast_node_type":"other","tokens":[{"end":43,"kind":"keyword","start":0,"text":"return"}]}
            return Err(cx.bug(format_args!(
            // Arity can be smaller in case of variable-length slices, but mustn't be larger.
                "uncaught type error: pattern {:?} has inconsistent arity (expected arity <= {ctor_arity})",