How to use the universalmutator.solidity_handler function in universalmutator

ignorePatterns = []
    if ignoreFile is not None:
        print("IGNORING PATTERNS DEFINED IN", ignoreFile)
        with open(ignoreFile, 'r') as ignoref:
            for l in ignoref:
                ignorePatterns.append(l[:-1])

    handlers = {"python": python_handler,
                "c": c_handler,
                "c++": cpp_handler,
                "cpp": cpp_handler,
                "java": java_handler,
                "swift": swift_handler,
                "rust": rust_handler,
                "go": go_handler,
                "solidity": solidity_handler,
                "vyper": vyper_handler}

    cLikeLanguages = [
        "c",
        "java",
        "swift",
        "cpp",
        "c++",
        "rust",
        "solidity",
        "go"]

    try:
        handlers["custom"] == custom_handler
    except BaseException:
        pass