[GHC] #393: functions without implementations

[GHC]

#393: functions without implementations
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        Reporter:  c_maeder          |            Owner:  simonpj
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  _|_
       Component:  Compiler (Type    |          Version:  None
  checker)                           |         Keywords:
      Resolution:  None              |     Architecture:  Unknown/Multiple
Operating System:  Unknown/Multiple  |       Difficulty:  Moderate (less
 Type of failure:  None/Unknown      |  than a day)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by goldfire):

 I'd like this, for one. As someone said previously, GHC should surely emit
 a warning when compiling an undefined function. And, I like the suggestion
 above of an informative `error` call instead of just using `undefined`.
 Thanks for rolling up your sleeves!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/393#comment:15>
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