Re: nest-sys revisited

On 17/03/2025 2:30 am, Hans Bezemer wrote:

On 14-03-2025 02:26, dxf wrote:

On 14/03/2025 3:19 am, albert@spenarnc.xs4all.nl wrote:

Apologize, for bad mouthing nested-sys in the coroutine discussion.
(not that I like this concept).
>
In the ISO 94 document the concept of nest-sys is indeed needed.
...

>
Unavoidable really.  Nesting aka subroutine call - the process of
calling a function and when it completes, returning to the caller -
is a basic computing concept.  In forth 'nest-sys' represents the
information necessary to facilitate that return.  It should not be
confused with invoking a function i.e. 'xt' EXECUTE.

 
I agree with most of what you say - except EXECUTE, a "function" can be called, but has to return *somewhere* - otherwise it is a BRANCH (jump).

Would you agree 'nest-sys' are peculiar to colon definitions.  That
EXECUTE is a different class of function.  It's not doing a 'call'
as such and not leaving anything on the 'return stack'?