Restrictions

In nlist, dummy arguments and functions are not permitted.

Subscripts of array elements must be integer constants greater than the lower bound and less than or equal to the upper bound.

EQUIVALENCE can associate automatic variables only with other automatic variables or undefined storage classes. These classes must be ones which are not in any of the COMMON, STATIC, SAVE, DATA, or dummy arguments.

An EQUIVALENCE statement can associate an element of type character with a noncharacter element. @

An EQUIVALENCE statement cannot specify that the same storage unit is to occur more than once in a storage sequence. For example, the following statement is not allowed:

       DIMENSION A (2) 
       EQUIVALENCE (A(1),B), (A(2),B) 

An EQUIVALENCE statement cannot specify that consecutive storage units are to be nonconsecutive. For example, the following statement is not allowed:

       REAL A (2) 
       DOUBLE PRECISION D (2) 
       EQUIVALENCE (A(1), D(1)), (A(2), D(2)) 

When COMMON statements and EQUIVALENCE statements are used together, several additional rules can apply. For such rules, refer to the notes on the COMMON statement.