That must have been the vibe I was getting. My haskell-spider senses
were tingling, I just overshot RT and went for the Halting Problem.
/Joe
Brandon S. Allbery KF8NH wrote:
On May 8, 2009, at 01:33 , Joe Fredette wrote:
That strikes me as being bad in a "I'm violating the Halting Problem"
sort of way- but I'm not sure how. Is there some contradictory
construction that
could be built from such a function?
I don't think it is; surely the Haskell runtime knows which thunks it
has evaluated. It just explicitly violates referential transparency,
and therefore must be in IO. You may be thinking that it would return
a result for _|_, but as described if you fed it _|_ it could only
produce False (if the _|_ has been evaluated you would not be able to
reach the test).
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