#13429: Optimizer produces Core with an infinite <<loop>> -------------------------------------+------------------------------------- Reporter: lehins | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 7.10.4 Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): Alberto Valverde [https://mail.haskell.org/pipermail/ghc- devs/2017-May/014222.html discovered] another occurrence of this bug: the `fingertree-0.1.1.0` [http://hackage.haskell.org/package/fingertree-0.1.1.0 test suite]: {{{ $ ~/Software/ghc-8.0.2/bin/ghc -O -fforce-recomp FingerTreeTestMain.hs [1 of 2] Compiling FingerTree ( FingerTree.hs, FingerTree.o ) [2 of 2] Compiling Main ( FingerTreeTestMain.hs, FingerTreeTestMain.o ) Linking FingerTreeTestMain ... $ ./FingerTreeTestMain True $ ~/Software/ghc-8.2.0.20170507/bin/ghc -O -fforce-recomp FingerTreeTestMain.hs [1 of 2] Compiling FingerTree ( FingerTree.hs, FingerTree.o ) [2 of 2] Compiling Main ( FingerTreeTestMain.hs, FingerTreeTestMain.o ) Linking FingerTreeTestMain ... $ ./FingerTreeTestMain FingerTreeTestMain: <<loop>> }}} In case it's useful, I'll attach a minimized version of the test suite. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13429#comment:16 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler