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

[GHC]

#4349: ASSERT failed! file compiler/types/FamInstEnv.lhs
----------------------------------+-----------------------------------------
    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
----------------------------------+-----------------------------------------

Comment(by daniel.is.fischer):

 Without -dcore-lint, the build went through. Trying the original settings
 with `ASSERT2`, it failed again, at the same point
 {{{
 WARNING: file compiler/stranal/WwLib.lhs line 435
 mkWWcpr: non-algebraic or open body type Data.Vector.Unboxed.Base.MVector
                                            s_a1Km (a_a1Kk, b_a1Kl)
 Interesting!  A join var that isn't let-no-escaped
     [$j{v s2go} [lid]]
 Interesting!  A join var that isn't let-no-escaped
     [$j{v s2i3} [lid]]
 Interesting!  A join var that isn't let-no-escaped
     [$j{v s2k7} [lid]]
 Interesting!  A join var that isn't let-no-escaped
     [$j{v s2mA} [lid]]
 <<ghc: 350473104 bytes, 24 GCs, 4297824/9371288 avg/max bytes residency (3
 samples),
  38M in use, 0.01 INIT (0.00 elapsed), 1.71 MUT (1.79 elapsed), 0.22 GC
 (0.22 elapsed) :ghc>>
 ghc-stage2: panic! (the 'impossible' happened)
   (GHC version 7.1.20100928 for i386-unknown-linux):
     ASSERT failed! file compiler/types/FamInstEnv.lhs line 322
 vector-0.7:Data.Vector.Unboxed.Base.Vector{tc rc3} []

 Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

 <<ghc: 490202972 bytes, 42 GCs, 5797537/12679584 avg/max bytes residency
 (4 samples),
  39M in use, 0.01 INIT (0.00 elapsed), 2.29 MUT (2.34 elapsed), 0.39 GC
 (0.39 elapsed) :ghc>>
 make[1]: *** [libraries/vector/dist-install/build/Data/Vector/Unboxed.o]
 Fehler 1
 make: *** [all] Fehler 2
 }}}
 (It's now line 322 because I inserted the ASSERT2 after the commented-out
 line 321.)
 Not overly informative output, I guess.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4349#comment:7>
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