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import annotation.{tailrec, switch}
object typers {
class List[+T] {
def :: (x: T) = new :: (x, this)
def len: Int = this match {
case x :: xs1 => 1 + xs1.len
case Nil => 0
}
}
object Nil extends List[Nothing]
case class :: [+T] (hd: T, tl: List[T]) extends List[T]
def len[U](xs: List[U]): Int = xs match {
case x :: xs1 => 1 + len(xs1)
case Nil => 0
}
object returns {
def foo(x: Int): Int = {
return 3
}
}
object tries {
val x = try {
"abc"
} catch {
case ex: java.io.IOException =>
123
} finally {
println("done")
}
val y = try 2 catch Predef.identity
val z = try 3 finally "abc"
}
class C {
@tailrec def factorial(acc: Int, n: Int): Int = (n: @switch) match {
case 0 => acc
case _ => factorial(acc * n, n - 1)
}
println(factorial(1, 10))
}
class Refinements {
val y: C { type T; val key: T; def process(x: T): Int }
}
}
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