[GHC] #11278: Spurious potential superclass cycle with constraint synonyms

[GHC]

#11278: Spurious potential superclass cycle with constraint synonyms
-------------------------------------+-------------------------------------
        Reporter:  ezyang            |                Owner:  simonpj
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  7.11
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"f13de71b4684ab7702de3ad01eb212d81f7c4a5d/ghc" f13de71/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="f13de71b4684ab7702de3ad01eb212d81f7c4a5d"
 Fix super-class cycle check

 Fixes Trac #11278
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11278#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler