16 lines
270 B
Text
16 lines
270 B
Text
MODE R = REF BOOL;
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R r := NIL;
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MODE U = UNION(BOOL, VOID);
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U u := EMPTY;
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IF r IS R(NIL) THEN
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print(("r IS NIL", new line))
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ELSE
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print(("r ISNT NIL", new line))
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FI;
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CASE u IN
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(VOID):print(("u is EMPTY", new line))
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OUT print(("u isnt EMPTY", new line))
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ESAC
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