#8184: Compiler panic in the presence of cyclic imports ---------------------------------------+----------------------------------- Reporter: parcs | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time crash | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: 910 | Blocked By: | Related Tickets: ---------------------------------------+----------------------------------- Comment (by simonpj): Yes, indeed. It is a significant flaw. The thing is, a `TyCon` in GHC literally points to its `DataCons` and they literally point to their `Types` and they literally point to the `TyCons` mentioned in the type. So there is a big cyclic data structure here. It's very convenient to ''use'', but a pain to ''build''. If I knew an easy solution I'd have adopted it, but I don't (yet). However for this particular problem I think we can adopt the solution I outlined. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8184#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler