#13293: ConstrainedClassMethods makes GeneralizedNewtypeDeriving fail -------------------------------------+------------------------------------- Reporter: j.waldmann | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: duplicate | 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: | -------------------------------------+------------------------------------- Changes (by rwbarton): * status: new => closed * resolution: => duplicate Comment: This is a duplicate of #12768; see there for much discussion. The short version is: while it would arguably be correct to be able to use GND in this particular case of a class with a method which is constrained by the same class, it's not useful enough to add special logic to GHC to handle it. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13293#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler