Resolving ambiguities between array and structure references

Note that is is possible to declare the same symbol x simultaneously as a simple variable, and array, and a structure. When a symbol x occurs in an expression, the following rules apply:

• If it is declared as an array, its array elements are expanded to a vector in the order specified by the array declaration.
• Else, if any components of x are declared, then the components are expanded to a vector in lexicographic order.
• Else x is interpreted as a variable reference.