solidity/test/cmdlineTests/standard_immutable_references/output.json

{
    "contracts":
    {
        "a.sol":
        {
            "A":
            {
                "evm":
                {
                    "deployedBytecode":
                    {
                        "immutableReferences":
                        {
                            "6":
                            [
                                {
                                    "length": 32,
                                    "start": 75
                                }
                            ]
                        }
                    }
                }
            }
        }
    },
    "sources":
    {
        "a.sol":
        {
            "id": 0
        }
    }
}