19 lines
363 B
Text
19 lines
363 B
Text
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MODULE Animals;
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TYPE
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Animal = POINTER TO AnimalDesc;
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AnimalDesc = RECORD END;
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Cat = POINTER TO CatDesc;
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CatDesc = RECORD (AnimalDesc) END;
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Dog = POINTER TO DogDesc;
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DogDesc = RECORD (AnimalDesc) END;
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Lab = POINTER TO LabDesc;
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LabDesc = RECORD (DogDesc) END;
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Collie = POINTER TO CollieDesc;
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CollieDesc = RECORD (DogDesc) END;
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END Animals.
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