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correct typo
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@ -574,7 +574,7 @@ println(foundAtIndex == 2) // true
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// 甚至是 Unicode 的数学运算符等
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prefix operator !!! {}
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// 定义一个前缀运算符,使矩形的边长放大三位
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// 定义一个前缀运算符,使矩形的边长放大倍
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prefix func !!! (inout shape: Square) -> Square {
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shape.sideLength *= 3
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return shape
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