GNU bug report logs - #62224
30.0.50: Emacs don't, start sends an erroneous error

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Package: emacs; Reported by: Andreas Röhler <andreas.roehler@HIDDEN>; dated Thu, 16 Mar 2023 18:09:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Subject: Re: bug#62224: 30.0.50: Emacs don't, start sends an erroneous error
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On 3/16/2023 1:07 PM, Eli Zaretskii wrote:
>> Date: Thu, 16 Mar 2023 11:45:40 -0700
>> From: Jim Porter <jporterbugs@HIDDEN>
>>
>> That said, I think *technically* the manual says that "\x" is allowed:
>>
>>> You can use any number of hex digits, so you can represent any
>>> character code in this way.
>>
>> Zero is a number, after all. :) Maybe the manual needs an update to be
>> more-precise here?
> 
> I'd say that'd be a pedantic interpretation of the text, but I've
> reworded it to avoid such misinterpretation anyway.

Oh, it's very pedantic, I agree. I'm not sure anyone would have 
misinterpreted that text in practice, but I think this makes it 100% 
clear what syntax is acceptable. Thanks for the fix.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#62224; Package emacs. Full text available.

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Subject: Re: bug#62224: 30.0.50: Emacs don't, start sends an erroneous error
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> Date: Thu, 16 Mar 2023 11:45:40 -0700
> From: Jim Porter <jporterbugs@HIDDEN>
> 
> That said, I think *technically* the manual says that "\x" is allowed:
> 
> > You can use any number of hex digits, so you can represent any
> > character code in this way.
> 
> Zero is a number, after all. :) Maybe the manual needs an update to be 
> more-precise here?

I'd say that'd be a pedantic interpretation of the text, but I've
reworded it to avoid such misinterpretation anyway.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#62224; Package emacs. Full text available.

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On 3/16/2023 11:08 AM, Andreas Röhler wrote:
> Emacs don't start sending an erroneous error, backtrace at the end of 
> this report.
> 
> Error points to the docstring of the function below, notably at the 
> escaped ‘x’:
> 
> ---
> (defun lean-input-compose (f g)
>    "\x -> concatMap F (G x)"
>    (lexical-let ((f1 f) (g1 g))
>      (lambda (x) (lean-input-concat-map f1 (funcall g1 x)))))
> ---

In Emacs Lisp, "\x" is the start of a hexadecimal character escape, like 
"\x41" for "A". In Emacs 29, just a plain "\x" was treated as NUL, but 
in Emacs 30, this is now a syntax error. I think that makes sense, since 
it helps catch likely mistakes such as this one.

That said, I think *technically* the manual says that "\x" is allowed:

> You can use any number of hex digits, so you can represent any
> character code in this way.

Zero is a number, after all. :) Maybe the manual needs an update to be 
more-precise here?

Ultimately, I think this is a bug in lean-mode though. I don't know 
anything about Lean in particular, but I think the docstring above is 
trying to use the backslash literally, rather than as an escape introducer.




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bug#62224; Package emacs. Full text available.

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Emacs don't start sending an erroneous error, backtrace at the end of 
this report.

Error points to the docstring of the function below, notably at the 
escaped ‘x’:

---
(defun lean-input-compose (f g)
   "\x -> concatMap F (G x)"
   (lexical-let ((f1 f) (g1 g))
     (lambda (x) (lean-input-concat-map f1 (funcall g1 x)))))
---

Debugger entered--Lisp error: (error "Invalid escape character syntax")
   read(#<buffer  *load*-183932>)
   eval-buffer(#<buffer  *load*-183932> nil 
"/home/my-name/.emacs.d/straight/build/lean-mode/lean..." nil t) ; 
Reading at buffer position 2036
load-with-code-conversion("/home/my-name/.emacs.d/straight/build/lean-mode/lean..." 
"/home/my-name/.emacs.d/straight/build/lean-mode/lean-input.el" nil t)
   require(lean-input)
   eval-buffer(#<buffer  *load*-311253> nil 
"/home/my-name/.emacs.d/straight/build/lean-mode/lean..." nil t) ; 
Reading at buffer position 1185
load-with-code-conversion("/home/my-name/.emacs.d/straight/build/lean-mode/lean..." 
"/home/my-name/.emacs.d/straight/build/lean-mode/lean..." nil t)
   require(lean-mode)
   eval-buffer(#<buffer  *load*-80552> nil "/home/my-name/.gnu-emacs25" 
nil t)  ; Reading at buffer position 10520
   load-with-code-conversion("/home/my-name/.gnu-emacs25" 
"/home/my-name/.gnu-emacs25" nil nil)
   load("/home/my-name/.gnu-emacs25")
   (cond ((string-match "^23" emacs-version) (setq custom-file 
(expand-file-name "~/.gnu-emacs23-cvs-custom")) (load (expand-file-name 
"~/.gnu-emacs23-all-cvs"))) ((string-match "^24" emacs-version) (setq 
custom-file (expand-file-name "~/.gnu-emacs24-custom")) (load 
(expand-file-name "~/.gnu-emacs24"))) (t (setq custom-file 
(expand-file-name "~/.gnu-emacs25-custom")) (load (expand-file-name 
"~/.gnu-emacs25"))))
   eval-buffer(#<buffer  *load*> nil "/home/my-name/.emacs" nil t)  ; 
Reading at buffer position 840
   load-with-code-conversion("/home/my-name/.emacs" 
"/home/my-name/.emacs" t t)
   load("~/.emacs" noerror nomessage)
   startup--load-user-init-file(#f(compiled-function () #<bytecode 
-0x19c7dbe75dab1fbb>) #f(compiled-function () #<bytecode 
-0x1f3c61addc0bc175>) t)
   command-line()
   normal-top-level()


GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, 
cairo version 1.16.0) of 2023-03-16





Acknowledgement sent to Andreas Röhler <andreas.roehler@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#62224; Package emacs. Full text available.
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Last modified: Thu, 16 Mar 2023 20:45:01 UTC

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