Confirm compiled code that uses return expression inside anonymous function.

javap-result1.txt

Compiled from "ReturnFromAnymousFunction.scala"
public final class ReturnFromAnonymousFunction$$anonfun$main$1 extends scala.runtime.AbstractFunction1$mcVI$sp implement
s scala.Serializable{
//...
public final void apply(int);
  Code:
   0:   aload_0
   1:   iload_1
   2:   invokevirtual   #19; //Method apply$mcVI$sp:(I)V
   5:   return
//It is specilazed version of Function1#apply
public void apply$mcVI$sp(int);
  Code:
   0:   getstatic       #30; //Field scala/Predef$.MODULE$:Lscala/Predef$;
   3:   iload_1
   4:   invokestatic    #36; //Method scala/runtime/BoxesRunTime.boxToInteger:(I)Ljava/lang/Integer;
   7:   invokevirtual   #40; //Method scala/Predef$.println:(Ljava/lang/Object;)V
   10:  iload_1
   11:  iconst_5
   12:  if_icmpge       30
   15:  new     #42; //class scala/runtime/NonLocalReturnControl
   18:  dup
   19:  aload_0
   20:  getfield        #44; //Field nonLocalReturnKey1$1:Ljava/lang/Object;
   23:  getstatic       #50; //Field scala/runtime/BoxedUnit.UNIT:Lscala/runtime/BoxedUnit;
   26:  invokespecial   #54; //Method scala/runtime/NonLocalReturnControl."<init>":(Ljava/lang/Object;Ljava/lang/Object;
)V
   29:  athrow // NonLocalReturnControl execption is thrown
   30:  return
//...
}

javap-result2.txt

public final class ReturnFromAnonymousFunction$ extends java.lang.Object implements scala.ScalaObject{
public static final ReturnFromAnonymousFunction$ MODULE$;

public static {};
  Code:
   0:   new     #9; //class ReturnFromAnonymousFunction$
   3:   invokespecial   #12; //Method "<init>":()V
   6:   return

public void main(java.lang.String[]);
  Code:
   0:   new     #16; //class java/lang/Object
   3:   dup
   4:   invokespecial   #18; //Method java/lang/Object."<init>":()V
   7:   astore_2
   8:   getstatic       #23; //Field scala/Predef$.MODULE$:Lscala/Predef$;
   11:  iconst_1
   12:  invokevirtual   #27; //Method scala/Predef$.intWrapper:(I)Lscala/runtime/RichInt;
   15:  bipush  10
   17:  invokevirtual   #33; //Method scala/runtime/RichInt.to:(I)Lscala/collection/immutable/Range$Inclusive;
   20:  new     #35; //class ReturnFromAnonymousFunction$$anonfun$main$1
   23:  dup
   24:  aload_2
   25:  invokespecial   #38; //Method ReturnFromAnonymousFunction$$anonfun$main$1."<init>":(Ljava/lang/Object;)V
   28:  invokevirtual   #44; //Method scala/collection/immutable/Range$Inclusive.foreach$mVc$sp:(Lscala/Function1;)V
   31:  goto    51
   34:  astore_3        // catch clause start
   35:  aload_3
   36:  invokevirtual   #50; //Method scala/runtime/NonLocalReturnControl.key:()Ljava/lang/Object;
   39:  aload_2
   40:  if_acmpne       52 // throwされたNonLocalReturn#key()と「同じ」オブジェクトで無ければ再throw (see 52)
   43:  aload_3
   44:  invokevirtual   #53; //Method scala/runtime/NonLocalReturnControl.value:()Ljava/lang/Object;
   47:  checkcast       #55; //class scala/runtime/BoxedUnit
   50:  pop
   51:  return
   52:  aload_3
   53:  athrow
  Exception table:
   from   to  target type
     8    34    34   Class scala/runtime/NonLocalReturnControl  //To catch NonLocalReturnControl

}

ReturnFromAnonymousFunction.scala

object ReturnFromAnonymousFunction {
  def main(args: Array[String]) {
    (1 to 10).foreach{i =>
      println(i)
      if(i < 5) return
    }
  }
}