contract C { mapping (uint => uint[]) public m; constructor() { m[0].push(); m[0].push(); m[0][1] = 42; } function f() public view { try this.m(0,1) returns (uint y) { assert(y == m[0][1]); // should hold } catch { assert(m[0][1] == 42); // should hold assert(m[0][1] == 1); // should fail } } } // ==== // SMTEngine: all // SMTIgnoreOS: macos // ---- // Warning 6328: (280-300): CHC: Assertion violation happens here. // Info 1391: CHC: 6 verification condition(s) proved safe! Enable the model checker option "show proved safe" to see all of them.