[GHC] #10249: Suboptimal error message with deferred type errors

[GHC]

#10249: Suboptimal error message with deferred type errors
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        Reporter:  Iceland_jack      |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  GHCi              |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by monoidal):

 For what's worth you don't need deferred type errors to see `ghciStepIO`;
 `x <- 'a'` shows a type error with it as well.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10249#comment:2>
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