loom

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def int :
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    end     = 0,
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    counter = 0
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def auto :
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    __init__ = fn [self] (int : b, int : e) -> auto
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        {
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            def self : s
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            s.end = e
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            s.counter = b - 1
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            return s
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        },
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    __iterator__ = fn (self : s) -> auto 
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        {
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            s.counter += 1
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            return s.counter
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        }
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