GNU bug report logs - #76949
30.1; --debug-init and condition-case-unless-debug

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From: Stefan Monnier <monnier@HIDDEN>
To: "Nussbaum Ferdinand" <ferdinand.nussbaum@HIDDEN>
Subject: Re: 30.1; --debug-init and condition-case-unless-debug
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> Errors inside condition-case-unless-debug do not trigger the debugger when the
> --debug-init startup option is set (and debug-on-error is not additionally and
> explicitly set to a non-nil value).

Indeed this is the direct consequence of:

> AFAICT this is no longer correct since the implementation uses handler-bind instead.

It seems cumbersome to fix this without re-introducing the problem that
`handler-bind` addresses, so I'm in favor of fixing the doc rather than
the code.


        Stefan

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From: "Nussbaum  Ferdinand" <ferdinand.nussbaum@HIDDEN>
To: "bug-gnu-emacs@HIDDEN" <bug-gnu-emacs@HIDDEN>
Subject: 30.1; --debug-init and condition-case-unless-debug
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--_000_GV0P278MB125423C7034727B3B1171ADAC4D62GV0P278MB1254CHEP_
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

Errors inside condition-case-unless-debug do not trigger the debugger when =
the
--debug-init startup option is set (and debug-on-error is not additionally =
and
explicitly set to a non-nil value).

This can be reproduced, for example, by adding the following to init.el:

(condition-case-unless-debug nil
    (error "error")
  (error
   (message "error caught")))

and restarting Emacs with --debug-init. In Emacs 29 this enters the debugge=
r
(as expected), while in Emacs 30 the message "error caught" is displayed.

On a related note, the Emacs Lisp reference manual still says the following=
: "[...]
use the option =91--debug-init=92. This binds debug-on-error to t while loa=
ding the
init file, [...]".
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Error-Debugging.=
html#Error-Debugging)
AFAICT this is no longer correct since the implementation uses handler-bind=
 instead.

(Originally reported in https://github.com/syl20bnr/spacemacs/issues/16871
and https://github.com/syl20bnr/spacemacs/issues/16619#issuecomment-2708510=
954.)

Best,
Ferdinand

--_000_GV0P278MB125423C7034727B3B1171ADAC4D62GV0P278MB1254CHEP_
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Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DWindows-1=
252">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<span style=3D"font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService,=
 Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Err=
ors inside condition-case-unless-debug do not trigger the debugger when the=
</span>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
--debug-init startup option is set (and debug-on-error is not additionally =
and</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
explicitly set to a non-nil value).</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
This can be reproduced, for example, by adding the following to init.el:</d=
iv>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
(condition-case-unless-debug nil</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp; (error &quot;error&quot;)</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; (error</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
&nbsp; &nbsp;(message &quot;error caught&quot;)))</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
and restarting Emacs with --debug-init. In Emacs 29 this enters the debugge=
r</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
(as expected), while in Emacs 30 the message &quot;error caught&quot; is di=
splayed.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
On a related note, the Emacs Lisp reference manual still says the following=
: &quot;[...]</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
use the option =91--debug-init=92. This binds debug-on-error to t while loa=
ding the</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
init file, [...]&quot;.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
(https://www.gnu.org/software/emacs/manual/html_node/elisp/Error-Debugging.=
html#Error-Debugging)</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
AFAICT this is no longer correct since the implementation uses handler-bind=
 instead.</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
(Originally reported in https://github.com/syl20bnr/spacemacs/issues/16871<=
/div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
and https://github.com/syl20bnr/spacemacs/issues/16619#issuecomment-2708510=
954.)</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
<br>
</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Best,</div>
<div class=3D"elementToProof" style=3D"font-family: Aptos, Aptos_EmbeddedFo=
nt, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; c=
olor: rgb(0, 0, 0);">
Ferdinand</div>
</body>
</html>

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