[GHC] #10814: Eliminate some ambiguity for IsString [a]

[GHC]

#10814: Eliminate some ambiguity for IsString [a]
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        Reporter:  dolio             |                Owner:  dolio
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Core Libraries    |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1572
       Wiki Page:                    |
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Comment (by thomie):

 Discussed in this thread:
 https://mail.haskell.org/pipermail/libraries/2015-May/025741.html

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10814#comment:4>
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