Here is the small program
public class Main {

   /**
    * @param args the command line arguments
    */
   public static void main(String[] args) {
       Vector<Integer> ids = new Vector<Integer>() {
           {
               addElement(0);
           }
       };
       int id = 0;
// for(int currentId : ids){ // (A)
        for(int i = 0; i < ids.size(); i++) { // (B)
        int currentId = ids.elementAt(i); // (B)
           if(id != currentId){
               ids.insertElementAt(new Integer(id), id);
               System.out.println("damn");
           }
       }

   }

}

I tried to debug this in Netbeans 6.5. If I step through the code using old-style for loop (B) the stepping works as expected.
If I use the enhanced-for loop (A), then the stepping stops at "damn" statement. Ofcourse it is not executing that statement. I guess it suppose to be hitting the closing brace after "damn".
Looks like the generated code has some wrong line number table, that is why this problem.

I used javap to get the Linenumber table attribute and it really seems to be wrong.
Main.java and Main.javap are attached.