block                                          (Assignable)

        Contains a code block that associates the Get object with a variable.
        The code block takes an optional argument that should assign the
        value of the argument to the variable.  If the argument is omitted,
        the code block should return the current value of the variable.

        If the GET variable is an array element, Get:block always returns the
        base of the array.  The subscript(s) in the expression are stored
        internally.  Thus, in the case of GETs on array elements, you cannot
        assign or retrieve the value of the array element by executing
        Get:block.  Setting and getting may be done on array element GET
        variables (and simple  variables as well) by use of the varGet() and
        varPut() methods, defined below.

        Note:  Use of the varGet and varPut messages--instead of directly
        evaluating the variable block in the GET--is the preferred method of
        accessing the GET variable.