Ticket #4360 (closed bug: fixed)
compiler crash building hashed-storage 0.5.3
|Reported by:||ganesh||Owned by:||simonpj|
|Type of failure:||Compile-time crash||Difficulty:|
|Test Case:||Blocked By:|
ghc: panic! (the 'impossible' happened) (GHC version 188.8.131.5200924 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.