not a reference - What does this mean?

[John M. Dlugosz]

Perl 6 doesn't have references anymore, it has captures.  So, what does 
the following mean:

@x = <foo bar>;
$a = [1, 2, [EMAIL PROTECTED];
I imagine that the 3rd element of the Array is itself an Array, and is 
the same object that is bound to @x.  But captures are lazy 
context-sensitive beasts, so I wonder if there is more poised to go on 
than I want or care about in this example.

 say $a[2] === @x;     #gives True
 @x[1] = "baz";
 say $a[2][1];  #gives baz

--John