#9838: PatternSynonyms and ConstraintKinds should not be required at the use site. -------------------------------------+------------------------------------- Reporter: ekmett | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.3 Component: Compiler | Keywords: Resolution: | Architecture: Unknown/Multiple Operating System: | Difficulty: Unknown Unknown/Multiple | Blocked By: Type of failure: | Related Tickets: None/Unknown | Test Case: | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by simonpj): * cc: cactus, goldfire (added) Comment: I agree 100%. Requiring a language extension flag at the definition but not the use is definitely GHC's standard policy. (Eg overlapping instances.) I understand about pattern synonyms. Gergo, could you look at this? I don't understand about constraint kinds. Can you give a concrete example? Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9838#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler