#14624: HEAD panic in ghc:DsForeign: toCType -------------------------------------+------------------------------------- Reporter: tianxiaogu | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: 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: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): A simpler way to trigger the panic that doesn't involve any Template Haskell: {{{#!hs {-# LANGUAGE CApiFFI #-} {-# LANGUAGE MagicHash #-} {-# LANGUAGE UnliftedFFITypes #-} module Foo where import GHC.Exts (Int#) foreign import capi safe "bar" bar :: Int# -> Int# }}} {{{ $ /opt/ghc/8.2.2/bin/ghc Foo.hs [1 of 1] Compiling Foo ( Foo.hs, Foo.o ) ghc: panic! (the 'impossible' happened) (GHC version 8.2.2 for x86_64-unknown-linux): toCType Int# 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/deSugar/DsForeign.hs:726:17 in ghc:DsForeign }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14624#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler