[GHC] #10662: GHC warning shows technical summary of AST instead of the user's code

[GHC]

#10662: GHC warning shows technical summary of AST instead of the user's code
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        Reporter:  kolmodin          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2-rc2
      Resolution:                    |             Keywords:  newcomer
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 simonpj):

 Mostly it's a matter of not-printing the stuff added by the typechecker.
 E.g. not printing the `HsWrap` constructor in `HsExpr`; that is already
 suppressed (and sadly there is no way to display it even when debugging).

 But currently we do print the `AbsBinds` constructor in `HsBinds`.
 Probably we shouldn't unless some flag `-fprint-typechecker-elaboration`
 is on.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10662#comment:7>
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