sold version: sold 0.77.0+commit.32833737.Linux.g++
contract C {
    modifier m1(uint value) {
        unchecked {
            uint a = 0;
        }
        _;
    }
    modifier m2(uint value) {
        unchecked {
            uint b = 0;
        }
        _;
    }
    function f() public m1(x = 2) m2(y = 3) returns (uint x, uint y) {
    }
} 
Unknown exception during compilation: Dynamic exception type: std::out_of_range
std::exception::what: map::at
Compilation failed