[GHC] #14002: Defining a function in GHCi results in different strictness behavior than defining it in a file

[GHC]

#14002: Defining a function in GHCi results in different strictness behavior than
defining it in a file
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        Reporter:  cocreature        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
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 lspitzner):

 seems to start occurring at ghc-7.10.

 also curios that `let func f = seq f f` does not show this error, while
 `let func f = seq f (\x -> f x)` does.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14002#comment:1>
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