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リストを逆順に表示 (Nested Flatten)

	
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Iterator::reverse: method fiber {
    arr: this.to_a;
    while (!arr.empty()) {
        yield arr[arr.size - 1];
        arr.pop_back();
    }
}

[1, 2, 3, 4, 5].each.reverse.to_a.p;

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