diff -r 7a8ea1397816 -r d718eddf01d9 mercurial/mdiff.py
--- a/mercurial/mdiff.py	Thu Dec 08 15:33:19 2022 +0100
+++ b/mercurial/mdiff.py	Thu Aug 31 23:56:15 2023 +0200
@@ -211,11 +211,7 @@
 
 
 def chooseblocksfunc(opts=None):
-    if (
-        opts is None
-        or not opts.xdiff
-        or not util.safehasattr(bdiff, 'xdiffblocks')
-    ):
+    if opts is None or not opts.xdiff or not hasattr(bdiff, 'xdiffblocks'):
         return bdiff.blocks
     else:
         return bdiff.xdiffblocks