bug#53678: 29.0.50; Invalid read syntax: "#<" for package install in Windows

[Shuguang Sun via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Alan Mackenzie <acm@muc.de> writes:

> Hello, Shuguang.
>
> On Tue, Feb 01, 2022 at 13:32:11 +0800, Shuguang Sun wrote:
>> Hi,
>
>> When I try to install packages from the Package Menu or the command of
>> package-install since about two weeks ago, it reports the error:
>> ```
>> error in process sentinel: async-when-done: Invalid read syntax: "#<"
>> error in process sentinel: Invalid read syntax: "#<"
>> ```
>> And it seems not preventing the installation process but stops the emacs
>> to compile the el files to elc.
>
> "#<" looks like the start of a symbol with position, something like
> "#<symbol foo at 666>" which is being returned by the reader recently
> when invoked from the byte compiler.
>

The issue has be fixed from the package (async) side.
https://github.com/jwiegley/emacs-async/issues/153#event-6295734933



> The new mechanism for compilation warning positions was merged into the
> Emacs master on Saturday 2022-01-22, which matches up pretty well with
> your "since about two weeks ago, ...".
>
>> FYI. I failed to find out what makes it. It looks like the local variable in
>> the autoloads file generated by the package process. It add
>> `;; coding: utf-8-emacs-unix`, however, in windows, the file is probablly
>> in a coding of utf-8-emacs-dos. When I try to open the autoload file,
>> Emacs can't regonize the major mode which assumes to be `emacs-lisp-mode`.
>> Unless I change the `;; coding: utf-8-emacs-unix` to
>> `;; coding: utf-8-emacs`, it can be open in the `emacs-lisp-mode`.
>
>
>
>> Best Regards,
>> Shuguang Sun
>
>> In GNU Emacs 29.0.50 (build 1, x86_64-w64-mingw32)
>>  of 2022-01-31 built on YJ190169-SSG
>> Repository revision: 04f9c3b8df6afaf1e9de9f2a4478f63fd959bf09
>> Repository branch: master
>> Windowing system distributor 'Microsoft Corp.', version 10.0.19044
>> System Description: Microsoft Windows 10 Pro (v10.0.2009.19044.1466)
>
>> Configured using:
>>  'configure --without-pop --with-native-image-api
>>  --with-native-compilation --without-compress-install
>>  '--program-transform-name=s/^ctags$/ctags.emacs/''
>
>> Configured features:
>> ACL DBUS GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES
>> NATIVE_COMP NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND SQLITE3 THREADS TIFF
>> TOOLKIT_SCROLL_BARS WEBP XPM ZLIB
>
>> Important settings:
>>   value of $LANG: CHS
>>   locale-coding-system: cp936

-- 
Best Regards
Shuguang Sun