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From: Lars Brinkhoff <lars.spam@nocrew.org>
Newsgroups: comp.lang.forth
Subject: Re: Recognizers and DT-TOKEN:
Organization: nocrew
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Date: Wed, 10 May 2017 13:59:25 +0200
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Ron Aaron wrote:
> That's exactly what 8th does. If it can't figure out what the thing it
> parsed is supposed to be, it invokes "???" with the string of the thing
> in question.  Since "???" is deferred, the user can put whatever there.

In my Forth, that deferred word is called NUMBER ( a u -- ).  You can
probably guess what the default action is.