#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 simonpj): Thanks, that's helpful. Does the `fingertree` example of the bug happen in HEAD? (The other example does not.) Are you sure it's the same bug? Just for info, I have investigated this a bit, and I know what's going on. The tricky bit is that we want to specialise dictionary functions (which arise from instance decls); but they produce dictionaries, and it's rather easy to mess up. I think I have a reasonably simple solution, but it's a solition I can't say is wrong, rather than one that obviously right. So I've been ruminating, so far to little avail. Is it actually a show-stopper for anyone? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13429#comment:17 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler