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     C/FORTRAN Run-Time Error R6001
 
     null pointer assignment
 
     The contents of the NULL segment changed during the course of
     program execution. The program wrote to this area, possibly due to
     an inadvertent assignment through a null pointer.
 
     The NULL segment is a location in low memory that is not normally
     used. The contents of the NULL segment are checked upon program
     termination. If a change is detected, this error is generated.
 
     This error appears only when the program writes to memory through
     a null pointer; the run-time library does not check reads from
     null pointers.
 
     Although a program that produces this run-time error may appear
     to operate correctly, references to null pointers may cause
     problems when executed under a different operating environment.
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