Review of std.signal

[Robert]

Sorry, I completely missed this message. Thanks for the hint, I 
fixed the documentation.

Best regards,

Robert

>
> No, it isn't.
> The function `void watch(string msg, int i)` from unit tests is 
> declarated into the unittest block. So, it's delegate because 
> it contains pointer to the unittest scope.
> Try to change function to the `static void watch(string msg, 
> int i)` and you'll see the same error.