bug#42588: closed (27.0.50; Emacs shell differs from a terminal in unexpected ways)

[GNU bug Tracking System]

Your message dated Sat, 01 Aug 2020 09:59:59 +0200
with message-id <878seykd8g.fsf@metalevel.at>
and subject line This issue is resolved by a change in Scryer Prolog
has caused the debbugs.gnu.org bug report #42588,
regarding 27.0.50; Emacs shell differs from a terminal in unexpected ways
to be marked as done.

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42588: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=42588
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> --- Begin Message ---
>
>
>
> Subject: 
>
> 27.0.50; Emacs shell differs from a terminal in unexpected ways
>
>
>
>
> Date: 
>
> Tue, 28 Jul 2020 22:44:09 +0200
>
>
>
>
> To reproduce this issue, please install Scryer Prolog in one of the ways
> indicated in its source repository:
>
>     https://github.com/mthom/scryer-prolog/
>
> For example, use:
>
>     $ cargo install scryer-prolog
>
> Then, start Emacs with:
>
>     $ emacs -Q
>
> and start a shell with M-x shell RET. In the shell, invoke Scryer Prolog
> and paste the following in the buffer:
>
>     writeq('\
>     '). % "\\\n" 
>
> Scryer Prolog will answer with:
>
>     caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
>     ?- caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
>     ?-
>
> However, when I launch Scryer Prolog in any terminal application and
> paste the exact same text, I get as response:
>
>     ''   true.
>
> So, the entire interaction reads, and is supposed to be:
>
>     ?- writeq('\
>     '). % "\\\n" 
>     ''   true.
>
> I expect the same result when posting this in the Emacs shell. However,
> in the Emacs shell, the entire interaction is unexpectedly:
>
>     bash-3.2$ ~/scryer-prolog/target/release/scryer-prolog 
>     ?- writeq('\
>     '). % "\\\n" 
>     caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
>     ?- caught: error(syntax_error(invalid_single_quoted_character),read_term/3)
>     ?- 
>
> Could you please have a look, and if possible implement the behaviour of
> the system terminal also in the Emacs shell?
>
> Thank you a lot!
> Markus
>
> In GNU Emacs 27.0.50 (build 1, x86_64-apple-darwin18.0.0, X toolkit, Xaw scroll 
> bars)
>  of 2018-11-15 built on mt-mac
> Repository revision: b4eb908f858284a7962851fd99c94598f76afa6f
> Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
> System Description:  Mac OS X 10.14.2
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> This issue is resolved by a change in Scryer Prolog
>
>
>
>
> Date: 
>
> Sat, 01 Aug 2020 09:59:59 +0200
>
>
>
>
> User-agent: 
>
> Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)
>
>
>
>
> A change was installed in Scryer Prolog that resolves this:
>
>   https://github.com/mthom/scryer-prolog/issues/643
>
> The system now works as expected in the Emacs shell.
>
> Thank you a lot!
> Markus
>
>
> --- End Message ---