那是因为 testArray 中 T 的具体类型在编译时是未知的.您的签名必须看起来像 def testArray[T : ClassManifest](n: Int, gen: =>T)，这将添加类型为 ClassManifest[T] 的隐式参数code> 到您的方法，它会自动传递给 testArray 的调用，然后进一步传递给 Array.fill 调用.这称为上下文绑定.

That is because in testArray the concrete type of T is not known at compile time. Your signature has to look like def testArray[T : ClassManifest](n: Int, gen: =>T), this will add an implicit parameter of type ClassManifest[T] to your method, that is automatically passed to the call of testArray and then further passed to the Array.fill call. This is called a context bound.