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[REBOL] Re: Ladislav: Interpreter Essay

From: lmecir:mbox:vol:cz at: 16-Oct-2001 21:54

Hi Mark, you didn't waste my time.
> But you can never get UNSET returned as the result of > an expression ie > > == unset
That is an error, IMO. There are expressions that yield the (Unset) value. The only difference between this value and any other value is, that the interpreter, when an expression yields the (Unset) value, doesn't print == unset at the console. Nevertheless, you can easily make sure, that a block like [print 1] really yields the (Unset) value when evaluated. Cheers Ladislav