重命名导入的静态函数有什么问题?

这是因为它不知道该用哪个原子。有两种可能性parseInt(String)和parseInt(String,int)。从REPL:

scala> atoi <console>:7: error: ambiguous reference to overloaded definition, both method parseInt in object Integer of type (x$1: java.lang.String)Int and  method parseInt in object Integer of type (x$1: java.lang.String,x$2: Int)Int match expected type ?
       atoi

println((args map ( atoi(_))).foldLeft(0)(_ + _));

看起来像个虫子。这里有一个简单的例子。

object A {
  def a(x: Any) = x
  def b = ()
}

{
  A.a(0)
  A.a _
}

{
  import A.a
  a(0)
  a _
}

{
  import A.{a => aa}
  aa(0)
  aa _  //  error: value aa is not a member of object this.A
}

{
  import A.{b => bb}
  bb
  bb _
}

toInt 方法来自 StringOps Integer.parseInt .

scala> Array("89", "78").map(_.toInt)
res0: Array[Int] = Array(89, 78)