#9167: Associated type is accepted even without mentioning class parameters -------------------------------------------------+------------------------- Reporter: goldfire | Owner: Type: bug | Status: Priority: low | closed Component: Compiler | Milestone: Resolution: fixed | Version: 7.8.2 Operating System: Unknown/Multiple | Keywords: Type of failure: None/Unknown | Architecture: Test Case: | Unknown/Multiple indexed_types/should_fail/T9167 | Difficulty: Blocking: | Unknown | Blocked By: | Related Tickets: -------------------------------------------------+------------------------- Comment (by archblob): The error message now says {{{ The associated type ‘F’ mentions none of the type variables of the class ‘C k a’ In the class declaration for ‘C’ }}} but {{{#!haskell class C (a :: k) where type F (b :: k) }}} is accepted although none of the class type variables are mentioned in the definition for `F` . If this is the intended behavior maybe the error message should say type or kind variables. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9167#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler