#9918: GHC chooses an instance between two overlapping, but cannot resolve a clause within the similar closed type family -------------------------------------+------------------------------------- Reporter: qnikst | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.3 Resolution: | Keywords: Operating System: | Architecture: Unknown/Multiple Unknown/Multiple | Difficulty: Unknown Type of failure: | Blocked By: None/Unknown | Related Tickets: Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Comment (by simonpj): Can you be more explicit? * What, precisely, are the changes needed to do from "version that does work using overlapping instances" to "version that does not work using closed type families"? * What, as precisely as possible, does not work? * Why did you think it should work? I can't figure that out from the 50 lines of code you give. Thanks Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9918#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler