The type command reports that the ls command is an alias, but it identifies the set command as a shell builtin.

type 命令报告指出，ls 命令是一个别名，但是它将 set 命令标识为一个 shell 内置命令。

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Extracts the result type of a callable, builtin type.

取出一个可调用内建类型的结果类型。

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Is it safe to have the synthesis templates take a callable builtin type or an MPL sequence as the first template argument?

让合成模板接受一个可调用内建类型或者一个mpl序列作为第一个模板参数是否安全？

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