When a Modula-2 pointer variable contains the NIL value the debuggershows the numeric value and also show the word NIL to

indicate that this pointer contains the NIL value.

When an Ada95 access variable contains the null value the debuggershows the numeric value and also show the word null to indicate that this pointercontains the null value.

The debugger will not let you expand a pointer variable thatcontains the NIL/null value.