#12967: GHC 8.0.1 Panic for current Aeson 1.0.2.1 -------------------------------------+------------------------------------- Reporter: bitemyapp | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- {{{ [1 of 1] Compiling Main ( Dates.hs, .stack- work/dist/x86_64-linux/Cabal-1.24.0.0/build/aeson-benchmark-dates/aeson- benchmark-dates-tmp/Main.o ) ghc: panic! (the 'impossible' happened) (GHC version 8.0.1 for x86_64-unknown-linux): Simplifier ticks exhausted When trying UnfoldingDone $s>$< 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: 153200 }}} I am not certain if this is a duplicate of: - https://ghc.haskell.org/trac/ghc/ticket/10083 - https://ghc.haskell.org/trac/ghc/ticket/12789 - https://ghc.haskell.org/trac/ghc/ticket/11263 - https://ghc.haskell.org/trac/ghc/ticket/5539 -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12967 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler