[GHC] #10160: GHCi :sprint has odd/unhelpful behavior for values defined within the REPL

[GHC]

#10160: GHCi :sprint has odd/unhelpful behavior for values defined within the REPL
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        Reporter:  bitemyapp         |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  GHCi              |                 Version:  7.8.4
      Resolution:                    |                Keywords:  :sprint
Operating System:  Unknown/Multiple  |  thunk evaluation non-strictness
 Type of failure:  Incorrect result  |  laziness runtime ghci repl
  at runtime                         |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:                    |               Test Case:
                                     |                Blocking:
                                     |  Differential Revisions:
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Comment (by bitemyapp):

 Yeah Carter had pointed me to the enumFromTo example which has behavior
 more like what I would expect.

 The optimization being performed makes sense, the inconsistencies do not.
 This would appear to mean I am limited to _|_ for reliably demonstrating
 what values as a general class will or won't get evaluated. Is there
 something more visual that wouldn't surprise beginners too much?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10160#comment:5>
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