'Int' and 'String' cannot be multiplied

//error: Cannot convert value of type 'Int' to specified type 'String'
let str =  'bar' * 5

参考了原生 String API 文档

// Swift.String
 @inlinable public static func + (lhs: String, rhs: String) -> String

SwifterSwift 中对 String 扩展的相关方法

// SwifterSwift/StringExtensions.swift

static func * (lhs: String, rhs: Int) -> String

static func * (lhs: Int, rhs: String) -> String

建议 String 与 Int 相乘的方法前增加 @inlinable

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