package Main+
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+
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class Stack[T] {+
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  var elems: List[T] = Nil+
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  def push(x: T) { elems = x :: elems }+
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  def top: T = elems.head+
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  def pop() { elems = elems.tail }+
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}+
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+
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object GenericsTest extends App{+
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  val stack = new Stack[Int]+
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  stack.push(1)+
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  stack.push('a')+
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  println(stack.top)+
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  stack.pop()+
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  println(stack.top)+
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}+
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