a foreach loop to allow iteration easily over containers.
The syntax should be like :

foreach (TypeName var 'in' Expression)
{
}

For example :
Vector<int> v = createVector();
foreach (int i in v)
{
// ...
}

Should only Iterable containers be handled by this construct ?
That is, should Vector class implements Iterable interface to be allowed to be recognized ?

interface Iterable
{
Iterator iterate();
}

Different approach exists :
- Iterable interface (returns an Iterator)
- lambda function passed to foreach method

Of course I prefer oo like constructs, but we should be able to do the second form later with continuations ...