[GHC] #14605: Core Lint error

[GHC]

#14605: Core Lint error
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:  TypeInType,
                                     |  DeferredTypeErrors
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14584            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"298ec78c8832b391c19d662576e59c3e16bd43b0/ghc"
 298ec78c/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="298ec78c8832b391c19d662576e59c3e16bd43b0"
 No deferred type errors under a forall

 As Trac #14605 showed, we can't defer a type error under a
 'forall' (when unifying two forall types).

 The fix is simple.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14605#comment:6>
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