#14232: Invalid type signature prokoves error in GHCi -------------------------------------+------------------------------------- Reporter: walling | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: GHCi | Version: 8.2.1 Keywords: | Operating System: MacOS X Architecture: x86_64 | Type of failure: Poor/confusing (amd64) | error message Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- When I create and save a file with the following content (notice the missing arrow `->`): {{{#!hs f :: (String -> a) String -> a f g s = g s }}} ... it outputs this snippet in GHCi (copy-pasted from terminal): {{{ $ ghci bug.hs GHCi, version 8.2.1: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling Main ( Playground/bug.hs, interpreted ) ghc: panic! (the 'impossible' happened) (GHC version 8.2.1 for x86_64-apple-darwin): repSplitAppTys String a_a1pl[sk:1] [] Call stack: CallStack (from HasCallStack): prettyCurrentCallStack, called at compiler/utils/Outputable.hs:1133:58 in ghc:Outputable callStackDoc, called at compiler/utils/Outputable.hs:1137:37 in ghc:Outputable pprPanic, called at compiler/types/Type.hs:808:9 in ghc:Type Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Leaving GHCi. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14232 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler