Correct swap.
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@ -340,7 +340,10 @@ def swap(stack):
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(a1 a2 -- a2 a1)
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(a1 a2 -- a2 a1)
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"""
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"""
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(a2, (a1, s23)) = stack
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try:
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(a2, (a1, s23)) = stack
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except ValueError:
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raise StackUnderflowError('Not enough values on stack.')
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return (a1, (a2, s23))
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return (a1, (a2, s23))
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