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object overloaded {
def f(x: String): String = x
def f[T >: Null](x: T): Int = 1
val x1 = f("abc")
val x2 = f(new Integer(1))
val x3 = f(null)
val x4: String => String = f
val x5: String => Any = f
val x6: Any = f _
def g(): Int = 1
def g(x: Int): Int = 2
val y1: Int => Int = g
val y2: Any = g _
println(g)
val xs = List("a", "b")
xs.mkString
def map(f: Char => Char): String = ???
def map[U](f: Char => U): Seq[U] = ???
map(x => x.toUpper)
}
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