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bug#27674: 26.0.50; cl-progv: strange scoping due to implementation
From: |
Noam Postavsky |
Subject: |
bug#27674: 26.0.50; cl-progv: strange scoping due to implementation |
Date: |
Thu, 13 Jul 2017 11:07:47 -0400 |
On Thu, Jul 13, 2017 at 10:40 AM, Roland Winkler <winkler@gnu.org> wrote:
>
> The docstring of cl-progv says
>
> Bind SYMBOLS to VALUES dynamically in BODY.
>
> But I am not sure whether this statement correctly reflects the actual
> code of cl-progv: cl-progv evaluates a let form at runtime, but it is
> not up to cl-progv to ensure dynamical binding. I believe it depends on
> whether lexical binding is on or off whether the code currently used by
> cl-progv uses dynamical binding or lexical binding.
No, because cl-progv omits the second argument to `eval', which is the
same as passing nil. This guarantees the evaluated let-bindings are
dynamic bindings.
> So it is my ignorant guess that a consistent behavior of cl-progv with
> lexical binding on or off requires that the bindings of SYMBOLS to
> VALUES is also passed to `eval' as a second arg.
Doing this would mean that cl-progv would always bind lexically. We
could, in theory, change cl-progv to be that way, but it would be
backwards incompatible with previous Emacs versions, and with Common
Lisp.
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Michael Heerdegen, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, npostavs, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Michael Heerdegen, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, npostavs, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Michael Heerdegen, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, npostavs, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Michael Heerdegen, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, npostavs, 2017/07/12
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Roland Winkler, 2017/07/13
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation,
Noam Postavsky <=
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Michael Heerdegen, 2017/07/14
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Roland Winkler, 2017/07/15
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Michael Heerdegen, 2017/07/14
- bug#27674: 26.0.50; cl-progv: strange scoping due to implementation, Stefan Monnier, 2017/07/19