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

contract C {
    uint immutable x;
    uint immutable y;
    constructor() public {
        (x, y) = f();
    }

    function f() internal pure returns(uint _x, uint _y) {
        _x = 3;
        _y = 4;
    }
}
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