// this class's bytecode, compiled under -optimize is analyzed by the test // method a's bytecode should be identical to method b's bytecode class SameBytecode { case class Foo(x: Int, y: String) def a = Foo(1, "a") match { case Foo(_: Int, y) => y } // this method's body holds the tree that should be generated by the pattern matcher for method a (-Xprint:patmat) // the test checks that bytecode for a and b is identical (modulo line numbers) // we can't diff trees as they are quite different (patmat uses jumps to labels that cannot be expressed in source, for example) // note that the actual tree is quite bad: we do an unnecessary null check, and local val (x3) // some of these will be fixed soon (the initial null check is for the scrutinee, which is harder to fix in patmat) def b: String = { val x1 = Foo(1, "a") if (x1.ne(null)) { return x1.y } throw new MatchError(x1) } }