[GHC] #11473: Levity polymorphism checks are inadequate

[GHC]

#11473: Levity polymorphism checks are inadequate
-------------------------------------+-------------------------------------
        Reporter:  simonpj           |                Owner:  goldfire
            Type:  bug               |               Status:  merge
        Priority:  highest           |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:  fixed             |             Keywords:
                                     |  LevityPolymorphism, TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Incorrect         |            Test Case:
  warning at compile-time            |  dependent/should_fail/T11473,
                                     |  typecheck/should_fail/BadUnboxedTuple
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * status:  closed => merge
 * testcase:  dependent/should_fail/T11473 => dependent/should_fail/T11473,
     typecheck/should_fail/BadUnboxedTuple


Comment:

 Found a corner case that wasn't handled in previous commit. Please merge
 for 8.0.

 Thanks!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11473#comment:17>
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