[GHC] #4349: ASSERT failed! file compiler/types/FamInstEnv.lhs

[GHC]

#4349: ASSERT failed! file compiler/types/FamInstEnv.lhs
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    Reporter:  daniel.is.fischer  |        Owner:                     
        Type:  bug                |       Status:  new                
    Priority:  normal             |    Milestone:                     
   Component:  Compiler           |      Version:  7.1                
    Keywords:                     |     Testcase:                     
   Blockedby:                     |   Difficulty:                     
          Os:  Linux              |     Blocking:                     
Architecture:  x86                |      Failure:  Building GHC failed
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Comment(by daniel.is.fischer):

 It was something else:
 {{{
 *** Core Lint errors : in result of Tidy Core ***
 {-# LINE 166 "libraries/base/GHC/Arr.lhs #-}:
     [RHS of GHC.Arr.indexError :: forall a_a8n b_a8o.
                                   GHC.Show.Show a_a8n =>
                                   (a_a8n, a_a8n) -> a_a8n ->
 GHC.Base.String -> b_a8o]
     Demand type has  4  arguments, rhs has  1 arguments,
 GHC.Arr.indexError
     Binder's strictness signature: DmdType TTTTb
 *** Offending Program ***
 GHC.Arr.$p1Ix [InlPrag=[NEVER]]
   :: forall a_a6B. GHC.Arr.Ix a_a6B => GHC.Classes.Ord a_a6B
 [GblId[ClassOp],
  Arity=1,
  Caf=NoCafRefs,
  Str=DmdType U(SAAAAAA),
  Unf=Unf{Src=<vanilla>, TopLvl=True, Arity=1, Value=True,
          ConLike=True, Cheap=True, Expandable=True,
          Guidance=ALWAYS_IF(unsat_ok=True,boring_ok=True)},
  RULES: Built in rule for GHC.Arr.$p1Ix: "Class op $p1Ix"]
 }}}
 Now I'll try without -dcore-lint.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4349#comment:6>
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