#7854: Constrained method type accepted in Haskell 98 mode -------------------------------------+------------------------------------- Reporter: refold | Owner: thomie Type: bug | Status: patch Priority: normal | Milestone: 7.12.1 Component: Compiler (Type | Version: 7.6.3 checker) | Keywords: newcomer Resolution: | Architecture: Operating System: Unknown/Multiple | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | typechecker/should_fail/T7854 Related Tickets: #10118, #10119 | Blocking: | Differential Revisions: Phab:D688 -------------------------------------+------------------------------------- Changes (by thomie): * status: new => patch * testcase: => typechecker/should_fail/T7854 * differential: => Phab:D688 * related: => #10118, #10119 Comment: Patches are ready for review in Phab:D686, Phab:D687 and Phab:D688. Instead of deprecating `ConstrainedClassMethods`, I have tried fixing it instead. Phab:D688 turns on `ConstrainedClassMethods` for all modes (Haskell98, Haskell2010 and default), to not break any programs. I added a section to "Known bugs and infelicities". Existing tests `tcfail149` and `tcfail150` have been reenabled, and I added `T7854` for the `MultiParamTypeClasses` case. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/7854#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler