#2893: Implement "Quantified contexts" proposal -------------------------------------+------------------------------------ Reporter: porges | Owner: Type: feature request | Status: new Priority: normal | Milestone: ⊥ Component: Compiler | Version: 6.10.1 Resolution: | Keywords: proposal Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by simonpj): The trouble is that I don't know how to do type inference in the presence of polymorphic constraints. It is not a small change. It would be a useful feature. I've wanted it since at least 2000 (see [http://research.microsoft.com/en-us/um/people/simonpj/papers/derive.htm Derivable Type Classes]). Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/2893#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler