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  • Glasgow Haskell Compiler
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  • #4360
Closed
Open
Created Oct 03, 2010 by ganesh@trac-ganesh

compiler crash building hashed-storage 0.5.3

ghc: panic! (the 'impossible' happened)
  (GHC version 7.0.0.20100924 for x86_64-unknown-linux):
        Expected one of wanted constraints (BUG)

This happens with cabal install hashed-storage-0.5.3, but that's a bit of a pain to reproduce as it depends on dataenc which needs a dependency bump. I cut it down to the attached file which just depends on mtl.

Trac metadata
Trac field Value
Version 6.13
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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CC ganesh
Operating system
Architecture
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information
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