Introduction
Variable are expressions which must refer directly to a variable. Any other forms of expressions such as constants, calculations, function calls, table references, etc, are forbidden and assert exceptions. However, variable members (in structures and __arrays_ are allowed). dim(), structure(), array() and protect() are common functions which utilize this variant of code pieces.
var 1[] = my array;
var 2[] = 'my array[]';
array( var 0[], {hog, bat, pig} );
// array( var 1[][], {dog, cat, rat} ); // This one is wrong
array( :var 2[], {dog, cat, rat} ); // This one is OK
echo( var 0[1] ); // bat
echo( my array[1] ); // catbat
cat