
#8634: Relax functional dependency coherence check ("liberal coverage condition") -------------------------------------+------------------------------------- Reporter: danilo2 | Owner: Type: feature | Status: new request | Milestone: 7.10.1 Priority: high | Version: 7.7 Component: Compiler | Keywords: Resolution: | Operating System: Unknown/Multiple Differential Revisions: Phab:D69 | Type of failure: None/Unknown Architecture: | Test Case: Unknown/Multiple | Blocking: Difficulty: Unknown | Blocked By: | Related Tickets: #1241, | #2247, #8356, #9103, #9227 | -------------------------------------+------------------------------------- Comment (by sulzmann): Regarding dropping the Consistency Condition (comment:41) Well, that's the minimal requirement I demand to call something Functional Dependencies. Oh, I see we are in the DysfunctionalDependencies world :) I'm also more than curious how to establish type safety without this requirement. What I'm describing in comment:33 are various forms of (type safe) Functional Dependencies where 'predictability' of type inference decreases the more we relax the coverage criteria. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8634#comment:44 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler