I can't think of any way to do this. For instance, the following code won't work:
1
obj.ReferenceEquals(f, f)
. This is because each reference to f can actually generate a new F# closure object behind the scenes. Section 6.9.24 of the spec (Values with Underspecified Object Identity and Type Identity) indicates that this behavior is unspecified, so presumably it could even vary between releases.
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I see that the parser monad does not "optimize" ored expressions that have the same start of sequence. I would need to recognize that two functions are equal to do this optimization. Something like:
and have f = f return true.
Is something like that possible in f#? Or do I need to tag the functions and compare the tags?