[GHC] #9795: Debug.Trace.trace is too strict

[GHC]

#9795: Debug.Trace.trace is too strict
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        Reporter:  jcpetruzza        |                   Owner:
            Type:  bug               |                  Status:  patch
        Priority:  normal            |               Milestone:  7.12.1
       Component:  libraries/base    |                 Version:  7.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:  Phab:D654
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Comment (by thomie):

 I'm confused. The examples from the description and from comment:1 print
 `a` before evaluating `b` in `trace a b`, when `a` is some fixed string.
 The problems arise when `a` can not be evaluated in full.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9795#comment:8>
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