#8390: regression in handling of type variables in constraints on instances which do not appear in the instance head ----------------------------------------------+---------------------------- Reporter: aavogt | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: invalid | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: GHC rejects valid program | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ----------------------------------------------+---------------------------- Changes (by aavogt): * status: new => closed * resolution: => invalid Comment: I found -XAllowAmbiguousTypes, added by commit 97db0edc4e637dd61ec635d1f9b6b6dd25ad890c, which allows the old behavior. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8390#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler