#9857: GHC 7.9 panics (simplifier ticks exhausted) on `half-0.2` -------------------------------------+------------------------------------- Reporter: hvr | Owner: simonpj Type: bug | Status: new Priority: high | Milestone: Component: Compiler | Version: 7.9 Resolution: | 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: | -------------------------------------+------------------------------------- Comment (by hvr): I've tried up to `-fsimpl-tick-factor=100000` and it still fails: {{{ $ ghc -Wall -O -fforce-recomp -fsimpl-tick-factor=100000 -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: 125160000 Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} does it make sense to try even higher? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9857#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler