[GHC] #11370: Redundant superclass warnings being included in -Wall destroys the "3 Release Policy"

[GHC]

#11370: Redundant superclass warnings being included in -Wall destroys the "3
Release Policy"
-------------------------------------+-------------------------------------
        Reporter:  ekmett            |                Owner:  bgamari
            Type:  bug               |               Status:  merge
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  7.10.3
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11369, #11429    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by bgamari):

 * status:  new => merge


Comment:

 Resolved with 8e9a87025f954a2704850bc71cb497f768d5d595. Needs merging to
 `ghc-8.0`. Handling of unrecognised warnings (#11429) is implemented in
 Phab:D1830.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11370#comment:21>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler