#10565: GHC 7.10.2 RC: the impossible happened on hPDB-examples-1.2.0.2 -----------------------------------------+--------------------------------- Reporter: snoyberg | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.10.2 Component: Compiler | Version: 7.10.2-rc1 Keywords: | Operating System: Linux Architecture: x86_64 (amd64) | Type of failure: None/Unknown Test Case: | Blocked By: Blocking: | Related Tickets: Differential Revisions: | -----------------------------------------+--------------------------------- When compiling with the RC for Stackage, I get: {{{ [1 of 1] Compiling Main ( examples/Rg.hs, dist/build/Rg/Rg- tmp/Main.o ) <no location info>: ghc: panic! (the 'impossible' happened) (GHC version 7.10.1.20150619 for x86_64-unknown-linux): Simplifier ticks exhausted When trying UnfoldingDone bindIO 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: 19573 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10565 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler