#14993: QuantifiedConstraints and principal types -------------------------------------+------------------------------------- Reporter: Iceland_jack | Owner: (none) Type: task | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.5 Resolution: | Keywords: | QuantifiedConstraints, wipT2893 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 AntC): I'd like to ask Simon a 'History of Haskell' type question while this development work is fresh in memory: The attention it gets in OutsideIn(X) shows the idea has stayed in the back of your mind since 2000. ghc's type inference engine gets radical surgery every half-decade or so. Did something happen that got `-XQuantifiedConstraints to a 'sweet spot'?/changed **4.2**'s evaluation as it being "not practical"? Or could it as easily have been developed in 2005 or 2010 or ...? -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14993#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler