#14194: ghci 8.0.2 panics -------------------------------------+------------------------------------- Reporter: jakubdaniel | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: x86_64 | (amd64) Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Description changed by jakubdaniel: Old description:
I know it is rather hard to replicate but (I currently cannot check whether it still occurs in 8.0.2+):
git clone https://github.com/jakubdaniel/expressions git clone https://github.com/jakubdaniel/expressions-z3 hg clone https://bitbucket.org/jd823592/z3-haskell
cd expressions-z3 cabal sandbox init cabal sandbox add-source ../expression cabal sandbox add-source ../z3-haskell cabal install && cabal exec ghci
λ> -- forget to :set -XTypeInType λ> :m Z3.Monad Data.Expression λ> -- forget to :m Data.Expression.Z3 λ> evalZ3 $ astToString =<< toZ3 (forall [var "x" :: Var 'IntegralSort] (exists [var "y" :: Var 'IntegralSort] (var "x" .+. var "y" .=. cnst 0)) :: Lia 'BooleanSort)
ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): initTc: unsolved constraints WC {wc_insol = [W] toZ3_a4CL :: t_a4CK[tau:1] (CHoleCan: toZ3) [W] toZ3_a4Dx :: t_a4Dw[tau:1] (CHoleCan: toZ3)}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
New description: I know it is rather hard to reproduce but (I currently cannot check whether it still occurs in 8.0.2+): git clone https://github.com/jakubdaniel/expressions git clone https://github.com/jakubdaniel/expressions-z3 hg clone https://bitbucket.org/jd823592/z3-haskell cd expressions-z3 cabal sandbox init cabal sandbox add-source ../expression cabal sandbox add-source ../z3-haskell cabal install && cabal exec ghci λ> -- forget to :set -XTypeInType λ> :m Z3.Monad Data.Expression λ> -- forget to :m Data.Expression.Z3 λ> evalZ3 $ astToString =<< toZ3 (forall [var "x" :: Var 'IntegralSort] (exists [var "y" :: Var 'IntegralSort] (var "x" .+. var "y" .=. cnst 0)) :: Lia 'BooleanSort) ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): initTc: unsolved constraints WC {wc_insol = [W] toZ3_a4CL :: t_a4CK[tau:1] (CHoleCan: toZ3) [W] toZ3_a4Dx :: t_a4Dw[tau:1] (CHoleCan: toZ3)} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14194#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler