#11172: Turning on optimisations produces SEGFAULT or Impossible case alternative -------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by bgamari): Hmm, I'm afraid I'm having some trouble reproducing this on 7.10.2, {{{ $ ghc --make -O -Wall Main.hs -fforce-recomp && ./Main [1 of 2] Compiling Module ( Module.hs, Module.o ) Module.hs:34:1: Warning: The import of ‘Control.Applicative’ is redundant except perhaps to import instances from ‘Control.Applicative’ To import instances alone, use: import Control.Applicative() [2 of 2] Compiling Main ( Main.hs, Main.o ) Main.hs:7:1: Warning: The import of ‘Control.Applicative’ is redundant except perhaps to import instances from ‘Control.Applicative’ To import instances alone, use: import Control.Applicative() Linking Main ... Main: Impossible case alternative [1826 ben@ben-laptop impossible-case-alternative-repro(master)] $ ghc -V The Glorious Glasgow Haskell Compilation System, version 7.10.2 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11172#comment:12 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler