#15709: GHC panic using TypeInType with minimal source code -------------------------------------+------------------------------------- Reporter: jnape | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.4.3 Resolution: duplicate | Keywords: TypeInType Operating System: Linux | Architecture: x86_64 Type of failure: Compile-time | (amd64) crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * status: new => closed * resolution: => duplicate Comment: Happily, I think this is probably fixed. (Search for the many tickets with `piResultTy` in them. GHC 8.6 fails with {{{ T15709.hs:10:25: error: • Expecting one more argument to ‘(p :: * -> b -> p * b)’ Expected kind ‘* -> *’, but ‘(p :: * -> b -> p * b)’ has kind ‘* -> b -> p * b’ • In the first argument of ‘Contravariant’, namely ‘(p :: * -> b -> p * b)’ In the type signature: dimap :: (Contravariant (p :: * -> b -> p * b), Functor (p a)) => (z -> a) -> (b -> c) -> p a b -> p z c | 10 | dimap :: (Contravariant (p :: * -> b -> p * b), Functor (p a)) => (z -> a) -> (b -> c) -> p a b -> p z c | ^^^^^^^^^^^^^^^^^^^^^^ T15709.hs:10:26: error: • Expected kind ‘* -> b -> p * b’, but ‘p’ has kind ‘* -> * -> *’ • In the first argument of ‘Contravariant’, namely ‘(p :: * -> b -> p * b)’ In the type signature: dimap :: (Contravariant (p :: * -> b -> p * b), Functor (p a)) => (z -> a) -> (b -> c) -> p a b -> p z c | 10 | dimap :: (Contravariant (p :: * -> b -> p * b), Functor (p a)) => (z -> a) -> (b -> c) -> p a b -> p z c | ^ }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15709#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler