[GHC] #11418: Suggest correct spelling when module is not found because of typo

[GHC]

#11418: Suggest correct spelling when module is not found because of typo
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        Reporter:  syd               |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  lowest            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by syd):

 Replying to [comment:25 hvr]:
 > Replying to [comment:24 syd]:
 > > For the record, I created the wiki page:
 https://ghc.haskell.org/trac/ghc/wiki/Proposal/HelpfulImportError
 >
 > Just to clarify, this feature is only relevant to `ghc --make` (and
 therefore may not benefit future cabal versions, as there's a chance that
 cabal will move away from using `ghc --make` altogether)?

 The mapping suggestion is only relevant to `ghc --make`, yes. If cabal
 moves away from using `ghc --make`, then that becomes cabal's
 responsibility. The import typo warning will stay relevant either way, but
 it may be implemented by using cabal's `exposed-modules` or `other-
 modules` instead.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11418#comment:26>
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