[GHC] #11071: The "Not in scope" error is misleading

[GHC]

#11071: The "Not in scope" error is misleading
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        Reporter:  mojojojo          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by osa1):

 I don't understand why would anyone conclude from this message:

 {{{
 Not in scope: NameSpace.name
 }}}

 that the namespace doesn't define the name. The message doesn't say
 anything about something being defined or not, it's very clearly saying
 that the name is not in scope. It may be because of different reasons.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11071#comment:1>
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