Please repeat yourself: The noexcept(noexcept(...)) idiom - The Old New Thing

Each time you say it, it means something different.

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Quite an interesting read. When explained it seems obvious but this whole "weirdness" is introduced because there are two types of "noexcept". The exception specifier and the exception checker. All because the committee doesn't want to introduce new keywords (which I respect).
- similar thing with requires requires { ...
  
  and you can nest it even further: requires requires { requires ...