Scala example source code file (bug997.scala)

This example Scala source code file (bug997.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

app, app, foo, foo, some, some, string, test, test

The Scala bug997.scala source code

// An extractor with 2 results
object Foo { def unapply(x : String)  = Some(Pair(x, x)) }

object Test extends App {

// Prints 'x'; ought not to compile (or maybe a should be the Pair?).
"x" match { case Foo(a) => Console.println(a) }

// Prints '(x,x)' as expected.
"x" match { case Foo(a, b) => Console.println((a,b)) }

// Gives confusing error 'not found: value c'.
"x" match { case Foo(a, b, c) => Console.println((a,b,c)) }

}