[GHC] #13187: Strange debug output printed: isPredTy Const Int (, ) Bool Char

[GHC]

#13187: Strange debug output printed: isPredTy Const Int (,) Bool Char
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        Reporter:  RyanGlScott       |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.2.1
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3033
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => patch
 * differential:   => Phab:D3033
 * milestone:   => 8.2.1


Comment:

 I like the idea of turning it into a `WARN`. I've done so in Phab:D3033,
 and refactored that comment below it a bit. Does this look OK?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13187#comment:3>
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