#7392: "the impossible happened" when compiling Types.Substitutions
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Reporter: martindemello | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 7.6.1
Keywords: | Os: Linux
Architecture: Unknown/Multiple | Failure: Compile-time crash
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Changes (by simonpj):
* difficulty: => Unknown
Old description:
> Ran into this when trying to compile elm from git:
>
> $ cabal install
> Resolving dependencies...
> Configuring Elm-0.5.0.1...
> Building Elm-0.5.0.1...
> Preprocessing library Elm-0.5.0.1...
> [ 3 of 26] Compiling Types.Substitutions ( src/Types/Substitutions.hs,
> dist/build/Types/Substitutions.o )
> ghc: panic! (the 'impossible' happened)
> (GHC version 7.6.1 for i386-unknown-linux):
> compiler/codeGen/CgCase.lhs:572:15-61: Irrefutable pattern failed
> for pattern ((CoreSyn.DEFAULT,
> deflt_absC) : others)
>
> Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
>
> Failed to install Elm-0.5.0.1
New description:
Ran into this when trying to compile elm from git:
{{{
$ cabal install
Resolving dependencies...
Configuring Elm-0.5.0.1...
Building Elm-0.5.0.1...
Preprocessing library Elm-0.5.0.1...
[ 3 of 26] Compiling Types.Substitutions ( src/Types/Substitutions.hs,
dist/build/Types/Substitutions.o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.6.1 for i386-unknown-linux):
compiler/codeGen/CgCase.lhs:572:15-61: Irrefutable pattern failed
for pattern ((CoreSyn.DEFAULT,
deflt_absC) : others)
}}}
Failed to install Elm-0.5.0.1
--
Comment:
Can you give explicit instructions to reproduce? Hackage only has Elm
0.3.6.2, and I don't know if you think that exposes the bug.
I had a look at download from the github repo, but it was going to install
two dozen packages with muttering about breaking some alread-installed
ones, so I lost heart.
Could you try with `-dcore-lint`. If that fails, send the output. If
not, can you use `-ddump-simpl -ddump-stg` and send that?
Simon
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7392#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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