[GHC] #13527: ghc has a stack space leak when prints warnings

[GHC]

#13527: ghc has a stack space leak when prints warnings
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        Reporter:  slyfox            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
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 Rufflewind):

 Strange that `utfDecodeString` returns `IO` but doesn’t call any `IO`
 functions besides `return`.

 As for `getCaretDiagnostic`, could perhaps revive this diff?
 https://phabricator.haskell.org/D2875

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13527#comment:4>
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