On 11/14/2012 09:53 AM, Ivan Lazar Miljenovic wrote:
   % cabal install virthualenv
   Resolving dependencies...
   cabal: Could not resolve dependencies:
   trying: virthualenv-0.2.1
   rejecting: base-3.0.3.2, 3.0.3.1 (global constraint requires installed
   instance)
   rejecting: base-4.6.0.0/installed-eac... (conflict: virthualenv =>
   base>=4.2.0.0 && <4.6)
   rejecting: base-4.6.0.0, 4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 
4.3.0.0,
   4.2.0.2, 4.2.0.1, 4.2.0.0, 4.1.0.0, 4.0.0.0 (global constraint requires
   installed instance)
Doesn't this prevent the error of "this package won't build" (even if
the error message doesn't precisely say that)?
In most cases, it replaces the uncertainty of a build error with an unconditional pre-build error.

instead of having either a package built or a meaningful build error, i now have no package with the information that it might or might not cause an error to continue.

--
Vincent

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