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

contract C {
    uint immutable x;
    constructor() public {
        x = 3 + x;
    }
}
// ----
// TypeError 7733: (78-79): Immutable variables cannot be read during contract creation time, which means they cannot be read in the constructor or any function or modifier called from it.