#13195: Ticks panic -------------------------------------+------------------------------------- Reporter: mojojojo | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: MacOS X Architecture: | Type of failure: Compile-time Unknown/Multiple | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{ Preprocessing test suite 'tests' for url-decoders-1... [1 of 1] Compiling Main ( tests/Main.hs, dist/build/tests /tests-tmp/Main.o ) <no location info>: error: ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-apple-darwin): Simplifier ticks exhausted When trying UnfoldingDone withForeignPtr1 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: 144969 }}} To reproduce the but, clone a repo under the specified commit from the following URL: https://github.com/nikita-volkov/url- decoders/tree/22410402a41b7524a1af03d78e381e9ea6354944 Then run the following command on the project: {{{ cabal configure --enable-tests && cabal build --ghc-options=-O2 }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13195 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler