这就是函子 fmap 与单子 = 的核心区别：后者会展开容器的一层嵌套，而前者保持嵌套结构。对函数式程序员而言，Promise.then() 同时兼具这两种特性是个问题。传入 then() 的函数既可以返回普通值也能返回新 Promise，且最终结果完全一致。实际上 Promise.then() 会展开任意层级的 Promise 嵌套。
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C156) STATE=C157; ast_Cc; continue;;
initiation. Early March obscuration implementation concealed this from users.