#11599: Why is UndecidableInstances required for an obviously terminating type family? -------------------------------------+------------------------------------- Reporter: heisenbug | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type | Version: 8.1 checker) | Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): The test is conservative. It could certainly be improved. The trick is how. A good project for someone. Lots of prior art! -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11599#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler