#6011: Panic when using a type synonym
--------------------------------+-------------------------------------------
Reporter: mm_freak | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler
Version: 7.4.1 | Keywords:
Os: Linux | Architecture: x86_64 (amd64)
Failure: Compile-time crash | Testcase:
Blockedby: | Blocking:
Related: |
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I'm getting the following "the impossible happened" error when trying to
compile the code in the attachment:
{{{
[2 of 3] Compiling Data.Mod.FiniteRing ( Data/Mod/FiniteRing.hs,
dist/build/Data/Mod/FiniteRing.o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.4.1 for x86_64-unknown-linux):
tyThingTyCon
Data constructor `modular-0.1.0:Data.Mod.Types.FiniteRing{d r0}'
}}}
This only happens when I use the Mod type synonym. When I spell the full
GenMod type everything works fine. Also the first compilation run after a
"cabal clean" works fine.
Steps to reproduce:
1. Unpack the attached cabal package.
2. Compile (cabal configure, cabal build).
3. Touch Data/Mod/FiniteRing.hs.
4. Compile again (cabal build).
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6011>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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