[darcs-devel] [patch1791] fix several uses of error where it shoul... (and 7 more)

[Ganesh Sittampalam]

Ganesh Sittampalam <ganesh at earth.li> added the comment:

>  * add new Exception types CommuteCommonPatches and PatchNotAvailable
  
>  We now throw these special exceptions instead of calling error. This is
>  because neither is (necessarily) a bug in Darcs. Instead these 
exceptions
>  can be thrown under normal conditions and indeed there are tests that
>  provoke these failures.

Same reservation as the other two cases - I don't know
what the user is supposed to do when they hit these.

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