swift：花太多时间编译字典文字代码

Question

为什么下面的字典文字代码需要12小时才能编译？ 显然，myCompany的类型为[String：[String：[String：String]]]

let myCompany = [
        "employees": [
            "employee 1": ["attribute": "value"],
            "employee 2": ["attribute": "value"],
            "employee 3": ["attribute": "value"],
            "employee 4": ["attribute": "value"],
            "employee 5": ["attribute": "value"],
            "employee 6": ["attribute": "value"],
            "employee 7": ["attribute": "value"],
            "employee 8": ["attribute": "value"],
            "employee 9": ["attribute": "value"],
            "employee 10": ["attribute": "value"],
            "employee 11": ["attribute": "value"],
            "employee 12": ["attribute": "value"],
            "employee 13": ["attribute": "value"],
            "employee 14": ["attribute": "value"],
            "employee 15": ["attribute": "value"],
            "employee 16": ["attribute": "value"],
            "employee 17": ["attribute": "value"],
            "employee 18": ["attribute": "value"],
            "employee 19": ["attribute": "value"],
            "employee 20": ["attribute": "value"],
        ]
    ]