[GHC] #15645: TypeChecking of Monad patterns incorrect with RebindableSyntax and OverloadedStrings

[GHC]

#15645: TypeChecking of Monad patterns incorrect with RebindableSyntax and
OverloadedStrings
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        Reporter:  NeilMitchell      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by NeilMitchell):

 Indeed, you can't use the name fail, which is unfortunate. The mysterious
 messages about things already happens - I get an error about `[Char]` vs
 `Text` - so the `IsString` thing is just the same consequence.

 I'd view this as a bug fix (overloaded strings should imply even generated
 strings are overloaded, if they are passed to user-controlled functions),
 but happy to go through GHC proposal process.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15645#comment:4>
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