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Bug in swapping tuples #187

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@jordi-petit

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@jordi-petit

Hello, consider the following program:

    x = 0

    def f():
        global x
        x += 1
        return x


    L = [(f(), f()) for i in range(4)]
    print(L)

    L = [(f(), f())[::-1] for i in range(4)]
    print(L)

When I execute it with the Python interpreter the output matches my expectation:

[(1, 2), (3, 4), (5, 6), (7, 8)]
[(10, 9), (12, 11), (14, 13), (16, 15)]

But when I execute it with Codon 0.15.3 the output is another:

[(1, 2), (3, 4), (5, 6), (7, 8)]
[(10, 11), (14, 15), (18, 19), (22, 23)]

It looks like some lazy computation produces the wrong result.

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