[GHC] #8968: Pattern synonyms and GADTs

[GHC]

#8968: Pattern synonyms and GADTs
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        Reporter:  kosmikus                   |            Owner:
            Type:  bug                        |           Status:  new
        Priority:  normal                     |        Milestone:
       Component:  Compiler (Type checker)    |          Version:
      Resolution:                             |  7.8.1-rc2
Operating System:  Unknown/Multiple           |         Keywords:
 Type of failure:  GHC rejects valid program  |     Architecture:
       Test Case:                             |  Unknown/Multiple
        Blocking:                             |       Difficulty:  Unknown
                                              |       Blocked By:
                                              |  Related Tickets:
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"50bfd4219157473fac47c70993fc2023a162a7f3/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="50bfd4219157473fac47c70993fc2023a162a7f3"
 Improve error reporting for untouchable type variables

 This change adds a suggestion
     Possible fix: add a type signature for ‘f’
 when we have a GADT-style definition with a
 type we can't figure out.

 See Note [Suggest adding a type signature] in TcErrors.

 This initially came up in the discussion of Trac #8968.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8968#comment:5>
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