Re: SYNONYM question

From	anton@mips.complang.tuwien.ac.at (Anton Ertl)
Newsgroups	comp.lang.forth
Subject	Re: SYNONYM question
Date	2016-02-04 11:08 +0000
Organization	Institut fuer Computersprachen, Technische Universitaet Wien
Message-ID	<2016Feb4.120858@mips.complang.tuwien.ac.at> (permalink)
References	<n8ssmo$aaa$1@dont-email.me> <56b25982$0$23831$e4fe514c@news.xs4all.nl>

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Albert van der Horst <albert@spenarnc.xs4all.nl> writes:
>Gerry Jackson <gerry@jackson9000.fsnet.co.uk> writes:
>>Having written the above, I just realised that exactly the same question
>>applies to a SYNONYM of a deferred word and using IS on the synonym.
>
>>defer p
>>synonym q p
>>' some-def is q
>
>>Again Gforth rejects this, but does accept
>>' some-def ' q defer!
>>which works correctly.
>
>>If these uses of SYNONYM are ambiguous conditions then it makes SYNONYM
>>less useful than it could be.
>
>Or it just proves that parsing words are evil ...

While parsing words are evil, this case does not show that.  It just
shows that we did not build a word-type check into DEFER!, while we
perform such a check at text interpretation time in IS. The reason is
that DEFER!  might occur inside a tight loop and a check could have a
measurable impact, while the text interpretation of IS costs so much
(and is therefore so rare) that the word-type check is peanuts in that
context.

- anton
-- 
M. Anton Ertl  http://www.complang.tuwien.ac.at/anton/home.html
comp.lang.forth FAQs: http://www.complang.tuwien.ac.at/forth/faq/toc.html
     New standard: http://www.forth200x.org/forth200x.html
   EuroForth 2015: http://www.rigwit.co.uk/EuroForth2015/

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SYNONYM question Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2016-02-03 12:47 +0000
  Re: SYNONYM question Mark Wills <markwills1970@gmail.com> - 2016-02-03 05:36 -0800
    Re: SYNONYM question stephen@mpeforth.com (Stephen Pelc) - 2016-02-03 15:36 +0000
      Re: SYNONYM question Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2016-02-03 17:26 +0000
        Re: SYNONYM question Bernd Paysan <bernd.paysan@gmx.de> - 2016-02-27 00:07 +0000
        Re: SYNONYM question hughaguilar96@gmail.com - 2016-02-26 18:44 -0800
      Re: SYNONYM question Mark Wills <markwills1970@gmail.com> - 2016-02-04 02:17 -0800
        Re: SYNONYM question Albert van der Horst <albert@spenarnc.xs4all.nl> - 2016-02-04 11:32 +0000
          Re: SYNONYM question stephen@mpeforth.com (Stephen Pelc) - 2016-02-04 17:12 +0000
      Re: SYNONYM question hughaguilar96@gmail.com - 2016-02-08 22:03 -0800
        Re: SYNONYM question Bernd Paysan <bernd.paysan@gmx.de> - 2016-03-03 00:09 +0000
          Re: SYNONYM question hughaguilar96@gmail.com - 2016-03-02 22:02 -0800
  Re: SYNONYM question anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-02-03 15:16 +0000
    Re: SYNONYM question Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2016-02-03 18:26 +0000
      Re: SYNONYM question Albert van der Horst <albert@spenarnc.xs4all.nl> - 2016-02-03 20:09 +0000
        Re: SYNONYM question Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2016-02-03 20:52 +0000
          Re: SYNONYM question "Elizabeth D. Rather" <erather@forth.com> - 2016-02-03 15:59 -1000
          Re: SYNONYM question Albert van der Horst <albert@spenarnc.xs4all.nl> - 2016-02-04 11:25 +0000
      Re: SYNONYM question Mark Wills <markwills1970@gmail.com> - 2016-02-04 02:16 -0800
        Re: SYNONYM question anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-02-04 11:18 +0000
      Re: SYNONYM question anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-02-04 10:54 +0000
        Re: SYNONYM question "HAA" <someone@microsoft.com> - 2016-02-04 23:35 +1100
  Re: SYNONYM question Albert van der Horst <albert@spenarnc.xs4all.nl> - 2016-02-03 19:48 +0000
    Re: SYNONYM question "HAA" <someone@microsoft.com> - 2016-02-04 11:07 +1100
    Re: SYNONYM question anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2016-02-04 11:08 +0000

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