contract C { function f() internal pure returns (bool) { bool b; assembly { b := 1 } // This assignment is overapproximated at the moment, we don't know value of b after the assembly block return b; } function g() public pure { assert(f()); // False positive currently assert(!f()); // should fail, now because of overapproximation in the analysis require(f()); // BMC constant value not detected at the moment require(!f()); // BMC constant value not ddetected at the moment } } // ==== // SMTEngine: all // ---- // Warning 7737: (70-89): Inline assembly may cause SMTChecker to produce spurious warnings (false positives). // Warning 6328: (239-250): CHC: Assertion violation happens here.\nCounterexample:\n\n\nTransaction trace:\nC.constructor()\nC.g()\n C.f() -- internal call // Warning 6328: (282-294): CHC: Assertion violation happens here.\nCounterexample:\n\n\nTransaction trace:\nC.constructor()\nC.g()\n C.f() -- internal call\n C.f() -- internal call