[GHC] #10816: Fixity declaration for associated type rejected

31 Aug 2015

      #10816: Fixity declaration for associated type rejected
-------------------------------------+-------------------------------------
              Reporter:  goldfire    |             Owner:
                  Type:  bug         |            Status:  new
              Priority:  normal      |         Milestone:
             Component:  Compiler    |           Version:  7.10.2
              Keywords:              |  Operating System:  Unknown/Multiple
          Architecture:              |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
             Test Case:              |        Blocked By:
              Blocking:              |   Related Tickets:
Differential Revisions:              |
-------------------------------------+-------------------------------------
 When I say

 {{{
 {-# LANGUAGE TypeOperators, TypeFamilies #-}

 module Bug where

 class C a where
   type a # b
   infix 4 #
 }}}

 I get

 {{{
 Bug.hs:7:11: ‘#’ is not a (visible) method of class ‘C’
 }}}

 But it really should just assign a fixity to the type `#`. It works if the
 fixity declaration is outside of the class.

--
Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10816
GHC http://www.haskell.org/ghc/
The Glasgow Haskell Compiler