Since feedparser messes with Python’s internals by assigning
to __code__ it needs to import SGMLParseError too. It also
expects SGMLParseError, which was turned into AssertionError by
https://github.com/python/cpython/commit/e34bbfd61f405eef89e8aa50672b0b25022de320

--- feedparser-6.0.10/feedparser/sgml.py.orig	2023-03-18 09:24:50.976316932 +0100
+++ feedparser-6.0.10/feedparser/sgml.py	2023-03-18 09:26:32.971928811 +0100
@@ -28,6 +28,7 @@
 import re
 
 import sgmllib
+from sgmllib import SGMLParseError
 
 __all__ = [
     'sgmllib',
@@ -41,6 +42,7 @@
     'shorttagopen',
     'starttagopen',
     'endbracket',
+    'SGMLParseError',
 ]
 
 # sgmllib defines a number of module-level regular expressions that are
--- feedparser-6.0.10/feedparser/html.py.orig	2023-03-18 09:32:03.647114745 +0100
+++ feedparser-6.0.10/feedparser/html.py	2023-03-18 09:46:05.021142671 +0100
@@ -349,7 +349,7 @@
 
         try:
             return sgmllib.SGMLParser.parse_declaration(self, i)
-        except sgmllib.SGMLParseError:
+        except AssertionError:
             # Escape the doctype declaration and continue parsing.
             self.handle_data('<')
             return i+1
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<tr><td><span title='2024-07-12 18:16:48 +0200'>2024-07-12</span></td><td><a href='/guix/commit/po/doc?id=ff82e0f7b48cd0d4dd906f5d52ba5d4940222086'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2024-06-03 00:27:12 +0200'>2024-06-03</span></td><td><a href='/guix/commit/po/doc?id=834a4195241806784d4b321b95f06d85f458ce18'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
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<tr><td><span title='2023-10-31 23:01:37 +0100'>2023-10-31</span></td><td><a href='/guix/commit/po/doc?id=938a47c86d7bea785f33f42834c5c1f3dfa594b0'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-10-05 23:14:54 +0200'>2023-10-05</span></td><td><a href='/guix/commit/po/doc?id=3d4d7fec05a8bdb0764a37515bb7c739b1094ab5'>doc: Fix channel name typo.</a><span class='msg-avail'>...</span></td><td>Nikolaos Chatzikonstantinou</td></tr>
<tr><td><span title='2023-09-30 19:34:32 +0200'>2023-09-30</span></td><td><a href='/guix/commit/po/doc?id=8027ee43373638e0773fec3532c1a13d3da95b6a'>nls: Update translations.</a></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-08-31 21:36:03 +0200'>2023-08-31</span></td><td><a href='/guix/commit/po/doc?id=57ab9536db20f98a36aeb25972137fbd752686cc'>nls: Update translations.</a></td><td>Florian Pelz</td></tr>
<tr><td><span title='2023-07-31 21:08:46 +0200'>2023-07-31</span></td><td><a href='/guix/commit/po/doc?id=39fbc041f92489ec30075a85937c8a38723752dc'>nls: Update translations.</a></td><td>Florian Pelz</td></tr>
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<tr><td><span title='2023-05-31 17:23:21 +0200'>2023-05-31</span></td><td><a href='/guix/commit/po/doc?id=8e9e6a6482f3ba98d1cdcad344ee488e8751fee7'>nls: Update translations.</a><span class='msg-avail'>...</span></td><td>Florian Pelz</td></tr>