Error message for unreachable code

[Walter Bright]

Oskar Linde wrote:
> I see this as an interesting case of where DMD issues an error for valid 
> code, where a typical C compiler at most would issue a warning. The 
> generated code (with or without const folding) will be correct. I would 
> like to hear why DMD considers the above an error while for instance 
> functions without return values are not.

It comes about from constant folding. It would be difficult for the 
compiler to tell that this code is unreachable.