Pattern match failure handling

[Gracjan Polak]

 Now when server encounters pattern match failure it outputs:
 
 src\AppControl.hs:43:24: Pattern match failure in do expression
 
 Really helps when running GHCi under Emacs. This message is parsed
 and by clicking on the link Emacs automatically goes to the specific
 file and line. Other editors may have similar feature.

Question:

How to peacefully handle undefined and error "xx"? The above is just a tiny wrapper around WebT.fail method.

--
Gracjan

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