[GHC] #13893: Improved Help for Control.Concurrent and Control.Exception when "variable not in scope"

[GHC]

#13893: Improved Help for Control.Concurrent and Control.Exception when "variable
not in scope"
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        Reporter:  vanto             |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.2
      Resolution:  wontfix           |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * status:  new => closed
 * resolution:   => wontfix


Comment:

 As with #13883, I agree there is a problem here but don't believe the
 compiler is the right place to solve it. This is the exact sort of problem
 which you want external tooling to solve. Afterall, in the case of `cabal
 new-build` GHC doesn't even know of all of the packages available.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13893#comment:2>
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