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Re: dynamic scoping in Forth in one line of code

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From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.lang.forth
Subject Re: dynamic scoping in Forth in one line of code
Date Tue, 01 Sep 2026 17:15:12 -0700
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Kragen Javier Sitaker <kragen@canonical.org> writes:
> I think you’ve internalized it sufficiently that it’s not surprising to
> you, but it was surprising to me when I encountered it a year and a half
> ago, at which point I’d been programming for 43 years and occasionally
> programming in Forth for 27 years.  Maybe I'm just a slow learner.

The idea has been in the literature for a long time (it's discussed at
length in Knuth vol. 1 from 1968), but I think it wasn't well understood
in the programming community til much more recently.  This might be of
interest:

https://www.chiark.greenend.org.uk/~sgtatham/quasiblog/coroutines-philosophy/

CO is similar to Knuth's (TAOCP's) coroutine jump as explained in the
"Coroutine paradigms" section of the article, I think.

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dynamic scoping in Forth in one line of code Kragen Javier Sitaker <kragen@canonical.org> - 2026-08-28 18:04 -0300
  Re: dynamic scoping in Forth in one line of code Paul Rubin <no.email@nospam.invalid> - 2026-08-28 18:12 -0700
    Re: dynamic scoping in Forth in one line of code Kragen Javier Sitaker <kragen@canonical.org> - 2026-08-29 10:50 -0300
  Re: dynamic scoping in Forth in one line of code albert@spenarnc.xs4all.nl - 2026-08-29 12:10 +0200
    Re: dynamic scoping in Forth in one line of code Kragen Javier Sitaker <kragen@canonical.org> - 2026-08-29 11:17 -0300
      Re: dynamic scoping in Forth in one line of code albert@spenarnc.xs4all.nl - 2026-08-30 12:49 +0200
        Re: dynamic scoping in Forth in one line of code Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-01 20:38 -0300
          Re: dynamic scoping in Forth in one line of code Paul Rubin <no.email@nospam.invalid> - 2026-09-01 17:15 -0700
            coroutines (was Re: dynamic scoping in Forth in one line of code) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-03 20:38 -0300
              Re: coroutines (was Re: dynamic scoping in Forth in one line of code) dxf <dxforth@gmail.com> - 2026-09-04 15:24 +1000
                dynamic scoping in Forth in one line of code (was Re: coroutines) Kragen Javier Sitaker <kragen@canonical.org> - 2026-09-04 13:04 -0300
                Re: dynamic scoping in Forth in one line of code (was Re: coroutines) dxf <dxforth@gmail.com> - 2026-09-05 02:59 +1000

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