#9857: GHC 7.9 panics (simplifier ticks exhausted) on `half-0.2` -------------------------------------+------------------------------------- Reporter: hvr | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.9 Keywords: | Operating System: Architecture: Unknown/Multiple | Unknown/Multiple Difficulty: Unknown | Type of failure: Compile- Blocked By: | time crash Related Tickets: | Test Case: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Compiling hackage:half-0.2 results in a GHC Panic: {{{ $ ghc --version && ghc --print-project-git-commit-id The Glorious Glasgow Haskell Compilation System, version 7.9.20141202 bf2d75417b5be7e8a79a26ee57a81e00682dabd4 $ cabal get half-0.2 && cd half-0.2/src/Numeric/ Unpacking to half-0.2/ $ ghc -Wall -O -fforce-recomp -c Half.hs ghc: panic! (the 'impossible' happened) (GHC version 7.9.20141202 for x86_64-unknown-linux): Simplifier ticks exhausted When trying UnfoldingDone lvl_s5yo To increase the limit, use -fsimpl-tick-factor=N (default 100) If you need to do this, let GHC HQ know, and what factor you needed To see detailed counts use -ddump-simpl-stats Total ticks: 125160 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9857 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler