#10527: Panic Simplifier ticks exhausted with type families -------------------------------------+------------------------------------- Reporter: sopvop | Owner: Type: bug | Status: new Priority: high | Milestone: 7.10.2 Component: Compiler | Version: 7.10.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Blocked By: | Test Case: Related Tickets: | Blocking: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * priority: normal => high * milestone: => 7.10.2 Comment: Confirmed regression from 7.10.1. {{{ $ /opt/ghc/7.10.1/bin/ghc -O -fforce-recomp Bug.hs -fsimpl-tick-factor=50 [1 of 1] Compiling Bug ( Bug.hs, Bug.o ) $ /opt/ghc/7.10.2/bin/ghc -O -fforce-recomp Bug.hs -fsimpl-tick- factor=5000 [1 of 1] Compiling Bug ( Bug.hs, Bug.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.10.1.20150609 for x86_64-unknown-linux): Simplifier ticks exhausted When trying UnfoldingDone $fFunctorConst_$cfmap 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: 11274000 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10527#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler