scala-hash origin/2.10.x -nc -Xcheckinit
[info] origin/2.1 => /Users/jason/usr/scala-v2.10.1-223-g53e031f
Welcome to Scala version 2.10.2-20130407-091443-53e031f553 (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_37).
Type in expressions to have them evaluated.
Type :help for more information.

scala> object terminal0 {
     |   private var cache: Any = ()
     |   def returning(f: () => Unit) = ()
     |   def foo {
     |     returning(() => cache = ())
     |   }
     |
     |   def apply(): Any = {
     |     cache
     |   }
     | }
defined module terminal0

scala> terminal0()
scala.UninitializedFieldError: Uninitialized field: <console>: 8
	at terminal0$.cache(<console>:8)