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The classes <code>t</code> and <code>null</code> are widely exploited in Lisp OO programming.
=={{header|ComponentPascal}}==
<lang ComponentPascal>
MODULE ObjectNil;
IMPORT StdLog;
TYPE
Object = POINTER TO ObjectDesc;
ObjectDesc = RECORD
END;
VAR
x: Object;
BEGIN
IF x = NIL THEN
StdLog.String("x is NIL");StdLog.Ln
END
END ObjectNil.
</lang>
=={{header|D}}==
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