Whats the difference between a final and non-final switch statement?

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On Tuesday, 30 July 2013 at 10:14:50 UTC, Gary Willoughby wrote:
> Whats the difference between a final and non-final switch 
> statement? I know the compiler complains when i don't use a 
> default case in a non-final switch statement but i've no idea 
> why.

http://dlang.org/statement.html#FinalSwitchStatement