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Simplifier ticks exhausted (when trying UnfoldingDone) from using lots of ByteString Builder literals

    • Closed Issue created by Sergey Vinokurov @sergv

    I've tried to port Cabal's Distribution.Simple.Build.PathsModule from Strings to Data.ByteString.Builder. The module uses lot's of string literals combined via ++. After enabling OverloadedStrings and changing ++ to Data.Semigroup.<> I got an error message like in the subject.

    I have reproduced the issue on self-contained example, attached.

    $ cd "/tmp/ghc-ticks-exhausted-bug/" && stack build
test-0.1.0.0: configure (lib)
Configuring test-0.1.0.0...
test-0.1.0.0: build (lib)
Preprocessing library test-0.1.0.0...
[1 of 1] Compiling Test             ( Test.hs, .stack-work/dist/x86_64-linux/Cabal-1.24.2.0/build/Test.o )

/tmp/ghc-ticks-exhausted-bug/Test.hs:17:21: warning: [-Wunused-top-binds]
    Defined but not used: data constructor ‘Linux’

/tmp/ghc-ticks-exhausted-bug/Test.hs:22:29: warning: [-Wunused-top-binds]
    Defined but not used: data constructor ‘Arm’

<no location info>: error:
    ghc: panic! (the 'impossible' happened)
  (GHC version 8.0.2 for x86_64-unknown-linux):
	Simplifier ticks exhausted
  When trying UnfoldingDone $
  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: 184333

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug


--  While building package test-0.1.0.0 using:
      /home/sergey/.stack/setup-exe-cache/x86_64-linux/Cabal-simple_mPHDZzAJ_1.24.2.0_ghc-8.0.2 --builddir=.stack-work/dist/x86_64-linux/Cabal-1.24.2.0 build lib:test --ghc-options " -ddump-hi -ddump-to-file"
    Process exited with code: ExitFailure 1
    Edited
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