#3590: panic (the impossible happened) when compiling with -O2
--------------------+-------------------------------------------------------
Reporter: yairchu | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 6.10.4 | Severity: normal
Keywords: | Testcase:
Os: MacOS X | Architecture: x86
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when compiling the attached program with -O2 I get the following error:
{{{
[1 of 1] Compiling Main ( crashTest.hs, crashTest.o )
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.4 for i386-apple-darwin):
Coercion.splitCoercionKindOf
ghc-prim:GHC.Prim.left{(w) tc 34B}
(ghc-prim:GHC.Prim.trans{(w) tc 34y}
(List-0.3:Data.List.Class.ItemM{tc r28}
(List-0.3:Control.Monad.ListT.ListT{tc r34}
(ghc-prim:GHC.Prim.(->){(w) tc 3D} a{tv ayS} [sk]))
(List-0.3:Control.Monad.ListT.ListT{tc r34}
(ghc-prim:GHC.Prim.(->){(w) tc 3D} a{tv ayS} [sk]) c{tv
ayR} [sk]))
(ghc-prim:GHC.Prim.(->){(w) tc 3D} a{tv ayS} [sk]
List-0.3:Control.Monad.ListT.:CoF:R5ItemM{tc r29}
List-0.3:Control.Monad.ListT.ListT{tc r34}
(ghc-
prim:GHC.Prim.(->){(w) tc 3D}
a{tv ayS}
[sk])
c{tv ayR}
[sk]))
<pred>List-0.3:Data.List.Class.ItemM{tc r28}
(List-0.3:Control.Monad.ListT.ListT{tc r34}
(ghc-prim:GHC.Prim.(->){(w) tc 3D} a{tv ayS} [sk]))
~
ghc-prim:GHC.Prim.(->){(w) tc 3D} a{tv ayS} [sk]
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
}}}
When compiling without -O2, it works.
I am using TypeFamilies (for the List class)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3590>
GHC <http://www.haskell.org/ghc/>
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