[GHC] #12881: GHC 8.0.2 regression involving OVERLAP annotations

[GHC]

#12881: GHC 8.0.2 regression involving OVERLAP annotations
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.2-rc1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * cc: simonpj (added)
 * milestone:   => 8.0.2


Comment:

 Simon, this commit (
 https://ghc.haskell.org/trac/ghc/changeset/d2958bd08a049b61941f078e51809c7e63bc3354/ghc
 ) once again appears to be responsible. Thoughts?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12881#comment:3>
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