When can you use it?

The new variant has the form:
```
for ( decl : expr )
```
expr has to deliver a value of the type Iterable.

Iterable is an interface type declared as follows:

0148: package java.lang;                                          // Iterable.java
0149: import java.util.Iterator;
0150: public interface Iterable 
0151: {
0152:    public Iterator iterator();
0153: }