[GHC] #11514: Impredicativity is still sneaking in

[GHC]

#11514: Impredicativity is still sneaking in
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        Reporter:  goldfire          |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
                                     |  ImpredicativeTypes
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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Comment (by simonpj):

 > This is worrying, but then again, :print has been known to trigger this
 isUnliftedType panic in other ways for some time now (see #14828). In
 light of this, I'm not sure if it's worth investing the effort to fix this
 :print panic, or just accept this as a known regression.

 Yes it looks exactly like #14828.  I'd be inlined to accept the
 regression.

 But it would be great if someone was to actually look at #14828.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11514#comment:3>
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