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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     FORTRAN compilation error F2228
 
     <subprogram> : formal argument <name> : previously passed by
       reference, now by value
 
     A formal argument previously passed by reference was passed by
     value.
 
     The REFERENCE attribute should be specified for the formal
     argument.
                                    -♦-