[GHC] #11169: Remove the word "skolem" from user error messages

[GHC]

#11169: Remove the word "skolem" from user error messages
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        Reporter:  dfeuer            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.10.2
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by kanetw):

 I agree, opaque words like rigid/skolem here should be replaced with
 something more comprehensible to normal users.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11169#comment:2>
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