solidity/test/libsolidity/syntaxTests/immutable/ctor_modifier_args.sol

contract C {
    uint immutable x;
    constructor() readX(x = 3) public { }

    modifier readX(uint _x) {
        _; f(_x);
    }

    function f(uint a) internal pure {}
}
// ----
// TypeError: (59-60): Immutable variables can only be initialized inline or assigned directly in the constructor.