Re: Back & Forth - Co-routines

On Thu, 6 Feb 2025 12:57:12 +0000, Anton Ertl wrote:

minforth@gmx.net (minforth) writes:

On Tue, 4 Feb 2025 12:26:26 +0000, albert@spenarnc.xs4all.nl wrote:

Remark that is doesn't introduce any unfamiliar syntax,
only does away with "Forth shall not nested definitions"
(Says who?)

>
Given that a Forth system supports quotations and xt-locals,
nested definitions are easy to implement.

>
You mean:
>
: foo [: ." xyz" ;] {: xt: bar :} bar ;
>
Sure, you then get a local that behaves similar to a nested
definition, but I don't think anyone would want to do that.

Yes, that's the mechanism. Actually I use it with some syntactic
sugar for better readability:
: foo
    <: bar ." xyz" ;>
  bar
;
I find this quite handy, since upvalues (locals within foo's
context) are accessible from within bar.