GNU bug report logs - #52295
28.0.90; Killing text results in coding system complaint

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Package: emacs; Severity: minor; Reported by: luangruo@HIDDEN; dated Sun, 5 Dec 2021 06:41:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
 <83k0gj4ezx.fsf@HIDDEN> <87sfv7qvgs.fsf@HIDDEN>
 <83ee6r4dq5.fsf@HIDDEN> <87ee6rqu6k.fsf@HIDDEN>
 <83a6hd3oba.fsf@HIDDEN> <874k7ljd2o.fsf@HIDDEN>
 <87ilw1hsij.fsf@HIDDEN> <83bl1szf1o.fsf@HIDDEN>
Date: Sun, 12 Dec 2021 18:58:22 +0800
In-Reply-To: <83bl1szf1o.fsf@HIDDEN> (Eli Zaretskii's message of "Tue, 07 Dec
 2021 16:05:07 +0200")
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Eli Zaretskii <eliz@HIDDEN> writes:

>> ??? It appears that coding_from_cp is actually returning nil in this
>> case.
>> 
>> This must be a bug in intern, because I don't see how else it could
>> possibly return nil.

> It could also be some memory-related snafu, or some stupid omission
> during startup when we run on Windows 9X.

FWIW, the problem doesn't appear with an unexec build (though I did have
to fix the build process somewhat to get unexec to work on the build
system running MSYS).

I will build a pdumper build with all the usual debug options and see
what comes up.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

Message received at 52295 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
In-Reply-To: <87ilw1hsij.fsf@HIDDEN> (message from Po Lu on Tue, 07 Dec
 2021 13:51:32 +0800)
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
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> From: Po Lu <luangruo@HIDDEN>
> Cc: 52295 <at> debbugs.gnu.org
> Date: Tue, 07 Dec 2021 13:51:32 +0800
> 
> Po Lu <luangruo@HIDDEN> writes:
> 
> > `globals_of_w32select' is called, but QANSICP is nil:
> >
> >   Fprint (QANSICP, Qexternal_debugging_output);
> >
> > Prints "nil" onto the console.
> 
> ??? It appears that coding_from_cp is actually returning nil in this
> case.
> 
> This must be a bug in intern, because I don't see how else it could
> possibly return nil.

It could also be some memory-related snafu, or some stupid omission
during startup when we run on Windows 9X.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

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On December 7, 2021 12:33:26 PM GMT+02:00, Po Lu <luangruo@yahoo=2Ecom> wro=
te:
> Eli Zaretskii <eliz@gnu=2Eorg> writes:
>=20
> > So I think there's no way around stepping into intern_1 and the
> > functions it calls, and figuring out what happens there=2E  I thought
> > you said GDB doesn't work on the target?  Then perhaps printfs will
> > help?
>=20
> Yes, GDB doesn't work there, but I modified coding_from_cp to look like
> this:
>=20
> static Lisp_Object
> coding_from_cp (UINT codepage)
> {
>   char buffer[30];
>   Lisp_Object sym;
>   sprintf (buffer, "cp%d-dos", (int) codepage);
>   sym =3D intern (buffer);
>   Fprint (sym, Qexternal_debugging_output);
>   return sym;
> }
>=20
> And it printed nil=2E
>=20

Yes=2E  But I meant you should go deeper, into 'intern' and its subroutine=
s, starting from intern_1=2E




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bug#52295; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
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Eli Zaretskii <eliz@HIDDEN> writes:

> On December 7, 2021 11:20:10 AM GMT+02:00, Po Lu <luangruo@HIDDEN> wrote:
>> Eli Zaretskii <eliz@HIDDEN> writes:
>> 
>> > Maybe 'intern' signals an error?  There's a check_obarray test inside
>> > intern_1, which could signal an error.
>> 
>> No error is signalled:
>> 
>> > If you print the value which 'intern' returns in coding_from_cp, do
>> > you see a nil value printed?
>> 
>> `nil' is printed in this case.
>> 
>> Thanks.
>> 
>> (I will not have access to that machine for a while, so I can't perform
>> any further testing on it for the next week or so.)
>> 

> So I think there's no way around stepping into intern_1 and the
> functions it calls, and figuring out what happens there.  I thought
> you said GDB doesn't work on the target?  Then perhaps printfs will
> help?

Yes, GDB doesn't work there, but I modified coding_from_cp to look like
this:

static Lisp_Object
coding_from_cp (UINT codepage)
{
  char buffer[30];
  Lisp_Object sym;
  sprintf (buffer, "cp%d-dos", (int) codepage);
  sym = intern (buffer);
  Fprint (sym, Qexternal_debugging_output);
  return sym;
}

And it printed nil.




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On December 7, 2021 11:20:10 AM GMT+02:00, Po Lu <luangruo@yahoo=2Ecom> wro=
te:
> Eli Zaretskii <eliz@gnu=2Eorg> writes:
>=20
> > Maybe 'intern' signals an error?  There's a check_obarray test inside
> > intern_1, which could signal an error=2E
>=20
> No error is signalled:
>=20
> > If you print the value which 'intern' returns in coding_from_cp, do
> > you see a nil value printed?
>=20
> `nil' is printed in this case=2E
>=20
> Thanks=2E
>=20
> (I will not have access to that machine for a while, so I can't perform
> any further testing on it for the next week or so=2E)
>=20

So I think there's no way around stepping into intern_1 and the functions =
it calls, and figuring out what happens there=2E  I thought you said GDB do=
esn't work on the target?  Then perhaps printfs will help?

Thanks=2E




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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
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Date: Tue, 07 Dec 2021 17:20:10 +0800
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Eli Zaretskii <eliz@HIDDEN> writes:

> Maybe 'intern' signals an error?  There's a check_obarray test inside
> intern_1, which could signal an error.

No error is signalled:

> If you print the value which 'intern' returns in coding_from_cp, do
> you see a nil value printed?

`nil' is printed in this case.

Thanks.

(I will not have access to that machine for a while, so I can't perform
any further testing on it for the next week or so.)




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On December 7, 2021 7:51:32 AM GMT+02:00, Po Lu <luangruo@yahoo=2Ecom> wrot=
e:
> Po Lu <luangruo@yahoo=2Ecom> writes:
>=20
> > `globals_of_w32select' is called, but QANSICP is nil:
> >
> >   Fprint (QANSICP, Qexternal_debugging_output);
> >
> > Prints "nil" onto the console=2E
>=20
> ??? It appears that coding_from_cp is actually returning nil in this
> case=2E
>=20
> This must be a bug in intern, because I don't see how else it could
> possibly return nil=2E
>=20

Maybe 'intern' signals an error?  There's a check_obarray test inside inte=
rn_1, which could signal an error=2E

If you print the value which 'intern' returns in coding_from_cp, do you se=
e a nil value printed?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

Message received at 52295 <at> debbugs.gnu.org:


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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
 <83k0gj4ezx.fsf@HIDDEN> <87sfv7qvgs.fsf@HIDDEN>
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 <83a6hd3oba.fsf@HIDDEN> <874k7ljd2o.fsf@HIDDEN>
Date: Tue, 07 Dec 2021 13:51:32 +0800
In-Reply-To: <874k7ljd2o.fsf@HIDDEN> (Po Lu's message of "Tue, 07 Dec 2021
 11:42:07 +0800")
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Po Lu <luangruo@HIDDEN> writes:

> `globals_of_w32select' is called, but QANSICP is nil:
>
>   Fprint (QANSICP, Qexternal_debugging_output);
>
> Prints "nil" onto the console.

??? It appears that coding_from_cp is actually returning nil in this
case.

This must be a bug in intern, because I don't see how else it could
possibly return nil.




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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
 <83k0gj4ezx.fsf@HIDDEN> <87sfv7qvgs.fsf@HIDDEN>
 <83ee6r4dq5.fsf@HIDDEN> <87ee6rqu6k.fsf@HIDDEN>
 <83a6hd3oba.fsf@HIDDEN>
Date: Tue, 07 Dec 2021 11:42:07 +0800
In-Reply-To: <83a6hd3oba.fsf@HIDDEN> (Eli Zaretskii's message of "Mon, 06 Dec
 2021 14:33:45 +0200")
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Po Lu <luangruo@HIDDEN>
>> Cc: 52295 <at> debbugs.gnu.org
>> Date: Sun, 05 Dec 2021 17:26:11 +0800
>> 
>> >> >   selection-coding-system
>> >> >   next-selection-coding-system
>> >> 
>> >> Both variables are nil.
>> >
>> > That's the problem.  But I don't understand why is that so.  The value
>> > of selection-coding-system is set in globals_of_w32select, which is
>> > called during startup, and where we have this code:
>> >
>> >   ANSICP = GetACP ();
>> >   OEMCP = GetOEMCP ();
>> >
>> >   QANSICP = coding_from_cp (ANSICP);
>> >   QOEMCP = coding_from_cp (OEMCP);
>> >
>> >   if (os_subtype == OS_SUBTYPE_NT)
>> >     Vselection_coding_system = Qutf_16le_dos;
>> >   else if (inhibit_window_system)
>> >     Vselection_coding_system = QOEMCP;
>> >   else
>> >     Vselection_coding_system = QANSICP;
>> >
>> > On Windows 9X, this should assign the ANSI codepage to
>> > selection-coding-system.  Since your codepage seems to be 1252, it
>> > should assign the symbol 'cp1252-dos' to selection-coding-system, see
>> > coding_from_cp.
>> >
>> > Why doesn't this happen in your case?
>> 
>> Maybe that variable is dumped during the build process, with a value
>> appropriate for NT, and when Emacs starts on a 9X system some other code
>> sees that it is invalid and sets it to nil?
>
> No, the code above is run in the dumped Emacs, when it starts, not in
> temacs.  So the values should reflect what happens when you start
> Emacs on the Windows 9X system.

> Could you perhaps add some printf's there to see what actually
> happens?  It almost looks like that code doesn't get called (which
> would be strange by itself), since coding_from_cp cannot possibly
> return nil.  Or maybe the initial assignment does work, but then some
> code resets the variable back to nil?

`globals_of_w32select' is called, but QANSICP is nil:

  Fprint (QANSICP, Qexternal_debugging_output);

Prints "nil" onto the console.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

Message received at 52295 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
In-Reply-To: <87ee6rqu6k.fsf@HIDDEN> (message from Po Lu on Sun, 05 Dec
 2021 17:26:11 +0800)
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
 <83k0gj4ezx.fsf@HIDDEN> <87sfv7qvgs.fsf@HIDDEN>
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> From: Po Lu <luangruo@HIDDEN>
> Cc: 52295 <at> debbugs.gnu.org
> Date: Sun, 05 Dec 2021 17:26:11 +0800
> 
> >> >   selection-coding-system
> >> >   next-selection-coding-system
> >> 
> >> Both variables are nil.
> >
> > That's the problem.  But I don't understand why is that so.  The value
> > of selection-coding-system is set in globals_of_w32select, which is
> > called during startup, and where we have this code:
> >
> >   ANSICP = GetACP ();
> >   OEMCP = GetOEMCP ();
> >
> >   QANSICP = coding_from_cp (ANSICP);
> >   QOEMCP = coding_from_cp (OEMCP);
> >
> >   if (os_subtype == OS_SUBTYPE_NT)
> >     Vselection_coding_system = Qutf_16le_dos;
> >   else if (inhibit_window_system)
> >     Vselection_coding_system = QOEMCP;
> >   else
> >     Vselection_coding_system = QANSICP;
> >
> > On Windows 9X, this should assign the ANSI codepage to
> > selection-coding-system.  Since your codepage seems to be 1252, it
> > should assign the symbol 'cp1252-dos' to selection-coding-system, see
> > coding_from_cp.
> >
> > Why doesn't this happen in your case?
> 
> Maybe that variable is dumped during the build process, with a value
> appropriate for NT, and when Emacs starts on a 9X system some other code
> sees that it is invalid and sets it to nil?

No, the code above is run in the dumped Emacs, when it starts, not in
temacs.  So the values should reflect what happens when you start
Emacs on the Windows 9X system.

Could you perhaps add some printf's there to see what actually
happens?  It almost looks like that code doesn't get called (which
would be strange by itself), since coding_from_cp cannot possibly
return nil.  Or maybe the initial assignment does work, but then some
code resets the variable back to nil?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

Message received at 52295 <at> debbugs.gnu.org:


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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
 <83k0gj4ezx.fsf@HIDDEN> <87sfv7qvgs.fsf@HIDDEN>
 <83ee6r4dq5.fsf@HIDDEN>
Date: Sun, 05 Dec 2021 17:26:11 +0800
In-Reply-To: <83ee6r4dq5.fsf@HIDDEN> (Eli Zaretskii's message of "Sun, 05 Dec
 2021 11:12:34 +0200")
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Eli Zaretskii <eliz@HIDDEN> writes:

>> From: Po Lu <luangruo@HIDDEN>
>> Cc: 52295 <at> debbugs.gnu.org
>> Date: Sun, 05 Dec 2021 16:58:27 +0800
>> 
>> >> w32--set-selection: Coding system is invalid or doesn't have an eol
>> >> variant for dos line ends: nil [2 times]
>> >
>> > What are the values of the following variables on that system?
>> >
>> >   selection-coding-system
>> >   next-selection-coding-system
>> 
>> Both variables are nil.
>
> That's the problem.  But I don't understand why is that so.  The value
> of selection-coding-system is set in globals_of_w32select, which is
> called during startup, and where we have this code:
>
>   ANSICP = GetACP ();
>   OEMCP = GetOEMCP ();
>
>   QANSICP = coding_from_cp (ANSICP);
>   QOEMCP = coding_from_cp (OEMCP);
>
>   if (os_subtype == OS_SUBTYPE_NT)
>     Vselection_coding_system = Qutf_16le_dos;
>   else if (inhibit_window_system)
>     Vselection_coding_system = QOEMCP;
>   else
>     Vselection_coding_system = QANSICP;
>
> On Windows 9X, this should assign the ANSI codepage to
> selection-coding-system.  Since your codepage seems to be 1252, it
> should assign the symbol 'cp1252-dos' to selection-coding-system, see
> coding_from_cp.
>
> Why doesn't this happen in your case?

Maybe that variable is dumped during the build process, with a value
appropriate for NT, and when Emacs starts on a 9X system some other code
sees that it is invalid and sets it to nil?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

Message received at 52295 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: Po Lu <luangruo@HIDDEN>
In-Reply-To: <87sfv7qvgs.fsf@HIDDEN> (message from Po Lu on Sun, 05 Dec
 2021 16:58:27 +0800)
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
 <83k0gj4ezx.fsf@HIDDEN> <87sfv7qvgs.fsf@HIDDEN>
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> From: Po Lu <luangruo@HIDDEN>
> Cc: 52295 <at> debbugs.gnu.org
> Date: Sun, 05 Dec 2021 16:58:27 +0800
> 
> >> w32--set-selection: Coding system is invalid or doesn't have an eol
> >> variant for dos line ends: nil [2 times]
> >
> > What are the values of the following variables on that system?
> >
> >   selection-coding-system
> >   next-selection-coding-system
> 
> Both variables are nil.

That's the problem.  But I don't understand why is that so.  The value
of selection-coding-system is set in globals_of_w32select, which is
called during startup, and where we have this code:

  ANSICP = GetACP ();
  OEMCP = GetOEMCP ();

  QANSICP = coding_from_cp (ANSICP);
  QOEMCP = coding_from_cp (OEMCP);

  if (os_subtype == OS_SUBTYPE_NT)
    Vselection_coding_system = Qutf_16le_dos;
  else if (inhibit_window_system)
    Vselection_coding_system = QOEMCP;
  else
    Vselection_coding_system = QANSICP;

On Windows 9X, this should assign the ANSI codepage to
selection-coding-system.  Since your codepage seems to be 1252, it
should assign the symbol 'cp1252-dos' to selection-coding-system, see
coding_from_cp.

Why doesn't this happen in your case?




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

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From: Po Lu <luangruo@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#52295: 28.0.90; Killing text results in coding system
 complaint
References: <875ys3sgfv.fsf.ref@HIDDEN> <875ys3sgfv.fsf@HIDDEN>
 <83k0gj4ezx.fsf@HIDDEN>
Date: Sun, 05 Dec 2021 16:58:27 +0800
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Date: Sun, 05 Dec 2021 14:40:04 +0800
>> From: luangruo--- via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
>> 
>> Trying to kill text on MS-Windows 9x results in the following complaint:
>> 
>> w32--set-selection: Coding system is invalid or doesn't have an eol
>> variant for dos line ends: nil [2 times]
>
> What are the values of the following variables on that system?
>
>   selection-coding-system
>   next-selection-coding-system

Both variables are nil.

Thanks.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.

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 Killing text results in coding system complaint
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> Date: Sun, 05 Dec 2021 14:40:04 +0800
> From: luangruo--- via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> Trying to kill text on MS-Windows 9x results in the following complaint:
> 
> w32--set-selection: Coding system is invalid or doesn't have an eol
> variant for dos line ends: nil [2 times]

What are the values of the following variables on that system?

  selection-coding-system
  next-selection-coding-system




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From: luangruo@HIDDEN
To: bug-gnu-emacs@HIDDEN
Subject: 28.0.90; Killing text results in coding system complaint
Date: Sun, 05 Dec 2021 14:40:04 +0800
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Trying to kill text on MS-Windows 9x results in the following complaint:

w32--set-selection: Coding system is invalid or doesn't have an eol
variant for dos line ends: nil [2 times]

In GNU Emacs 28.0.90 (build 1, i686-pc-mingw32) of 2021-12-05 built on MACH=
INE

Windowing system distributor =E2=80=98Microsoft Corp.', version 4.10.2222
System Description: Microsoft Windows 98 (v4.10.2222)
Configured using:

=E2=80=98configure --with-gnutls=3Difavailable --prefix=3D/emacs-28.0.90/..=
/prefix'
Configured features:
ACL MODULES NOTIFY W32NOTIFY PDUMPER SOUND THREADS TOOLKIT SCROLL_BARS
Important settings:

value of $LANG: enu

locale-coding-system: cp1252
Major mode: Fundamental




Acknowledgement sent to luangruo@HIDDEN:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#52295; Package emacs. Full text available.
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