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(g77-295.info)No Passing External Assumed-length

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No Passing External Assumed-length
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   `g77' disallows passing of an external procedure as an actual
argument if the procedure's type is declared `CHARACTER*(*)'.  For
example:

     CHARACTER*(*) CFUNC
     EXTERNAL CFUNC
     CALL FOO(CFUNC)
     END

It isn't clear whether the standard considers this conforming.