#11611: ghc panics -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by hvr): I notice you're not using a recent GHC HEAD snapshot. I've just tried in recent GHC HEAD & GHC 8.0RC and in both cases GHC does not panic: {{{ $ ghci-8.0.0.20160218 -ignore-dot-ghci Panic.hs GHCi, version 8.0.0.20160218: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Main ( Panic.hs, interpreted ) Panic.hs:6:37: error: • Expected kind ‘[*]’, but ‘a’ has kind ‘*’ • In the first argument of ‘A’, namely ‘a’ In the first argument of ‘Show’, namely ‘A a’ In the stand-alone deriving instance for ‘Show a => Show (A a)’ }}} {{{ $ ghci-8.1.20160218 -ignore-dot-ghci Panic.hs GHCi, version 8.1.20160218: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Main ( Panic.hs, interpreted ) Panic.hs:6:37: error: • Expected kind ‘[*]’, but ‘a’ has kind ‘*’ • In the first argument of ‘A’, namely ‘a’ In the first argument of ‘Show’, namely ‘A a’ In the stand-alone deriving instance for ‘Show a => Show (A a)’ Failed, modules loaded: none. Prelude> }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11611#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler