[GHC] #12784: Typechecker regression in GHC 8.0.2 involving DefaultSignatures

[GHC]

#12784: Typechecker regression in GHC 8.0.2 involving DefaultSignatures
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  merge
        Priority:  highest           |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.2-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12918            |  Differential Rev(s):  Phab:D2682,
       Wiki Page:                    |  Phab:D2786
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Changes (by RyanGlScott):

 * version:  8.1 => 8.0.2-rc1
 * milestone:  8.2.1 => 8.0.2


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12784#comment:30>
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