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derefr

Let me put it another way: the following are the same code:

if: x <= y, do: foo(), else: nothing()

if: y < x, do: nothing(), else: foo()

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Shouldn't the last statement be:

if: y > x, do: nothing(), else: foo()

Nope, order of evaluation might matter with impure code.

How exactly? Well there is an extreme case where x and y are volatile but even then the order is implementation defined so I can't see a world where it matters.

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