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fix(Dart): Avoid using num as a variable name (#946)
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@@ -13,8 +13,8 @@ void main() {
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print('列表 nums = $nums');
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/* 访问元素 */
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int num = nums[1];
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print('访问索引 1 处的元素,得到 num = $num');
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int _num = nums[1];
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print('访问索引 1 处的元素,得到 _num = $_num');
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/* 更新元素 */
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nums[1] = 0;
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