#13429: Optimizer produces Core with an infinite <<loop>> -------------------------------------+------------------------------------- Reporter: lehins | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 7.10.4 Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Incorrect result | Unknown/Multiple at runtime | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dfeuer): I am getting the very strong feeling that the problem has a lot to do with `UndecidableInstances`, constraint simplification, or something in that general area. Simplifying constraints by hand seems to make the bug go away. Removing the `INLINE` annotation seems to do so as well. I created a reduced test case, which hopefully will be simpler to work on. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13429#comment:11 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler