bug#57635: 29.0.50; Look into using generator.el's CPS machinery to repl

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bug#57635: 29.0.50; Look into using generator.el's CPS machinery to repl

From:	Jim Porter
Subject:	bug#57635: 29.0.50; Look into using generator.el's CPS machinery to replace 'eshell-do-eval'
Date:	Tue, 6 Sep 2022 20:58:00 -0700

In order to make long-running Eshell commands behave more-nicely, Eshelluses iterative evaluation of many commands so that it can return controlback to the rest of Emacs. This has a lot of similarity to howgenerator.el works.

This would hopefully help prevent obscure bugs in Eshell, such asbug#54190. In that bug, Stefan mentions[1]:

Looks like a bug somewhere in the `eshell-do-eval` machinery, yes.
Until we find the problem (or rewrite `eshell-do-eval` on top of the CPS
converter of `generator.el`), I think reverting this change (and adding
a comment pointing to this bug) sounds like a great plan.


[1] https://debbugs.gnu.org/cgi/bugreport.cgi?bug=54190#17

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bug#57635: 29.0.50; Look into using generator.el's CPS machinery to replace 'eshell-do-eval', Jim Porter <=
- bug#57635: 29.0.50; Look into using generator.el's CPS machinery to replace 'eshell-do-eval', Stefan Monnier, 2022/09/07
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