What is the use case for this weird switch mecanism

[Era Scarecrow]

On Wednesday, 31 October 2012 at 22:58:32 UTC, bearophile wrote:
> Era Scarecrow:
>> But 'switch with' seems the proper way to put it in my mind.
>
> It's not worth the unsafety of the whole switch.

  What? I'd need a little explanation what you'd mean. besides, 
'switch with' and 'with switch' are practically identical... 
aren't they?