Dan Piponi wrote:
On Mon, Oct 12, 2009 at 10:42 AM, muad <muad.dib.sp...@gmail.com> wrote:
Is it possible to prove correctness of a functions by testing it?
consider a function of signature
swap :: (a,b) -> (b,a)
We don't need to test it at all, it can only do one thing, swap its
arguments. (Assuming it terminates.)
swap = undefined
Terminates and does not swap its arguments :-) What do free theorems
say about this, exactly -- do they just implicitly exclude this possibility?
Neil.
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