diff --git a/.hgsigs b/.hgsigs
--- a/.hgsigs
+++ b/.hgsigs
@@ -249,3 +249,4 @@ 271a4ab29605ffa0bae5d3208eaa21a95427ff92
 bb42988c7e156931b0ff1e93732b98173ebbcb7f 0 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
 3ffc7209bbae5804a53084c9dc2d41139e88c867 0 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
 787af4e0e8b787e1b77a8059926b123730a4cd01 0 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
+5a8b5420103937fca97c584c5162178eed828ada 0 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
diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -265,3 +265,4 @@ 271a4ab29605ffa0bae5d3208eaa21a95427ff92
 bb42988c7e156931b0ff1e93732b98173ebbcb7f 6.5rc0
 3ffc7209bbae5804a53084c9dc2d41139e88c867 6.5
 787af4e0e8b787e1b77a8059926b123730a4cd01 6.5.1
+5a8b5420103937fca97c584c5162178eed828ada 6.5.2
diff --git a/mercurial/transaction.py b/mercurial/transaction.py
--- a/mercurial/transaction.py
+++ b/mercurial/transaction.py
@@ -16,6 +16,7 @@ import os
 
 from .i18n import _
 from . import (
+    encoding,
     error,
     pycompat,
     util,
@@ -229,7 +230,7 @@ class transaction(util.transactional):
         validator=None,
         releasefn=None,
         checkambigfiles=None,
-        name='<unnamed>',
+        name=b'<unnamed>',
     ):
         """Begin a new transaction
 
@@ -318,7 +319,7 @@ class transaction(util.transactional):
     def __repr__(self):
         name = b'/'.join(self._names)
         return '<transaction name=%s, count=%d, usages=%d>' % (
-            name,
+            encoding.strfromlocal(name),
             self._count,
             self._usages,
         )
@@ -574,7 +575,7 @@ class transaction(util.transactional):
         self._file.flush()
 
     @active
-    def nest(self, name='<unnamed>'):
+    def nest(self, name=b'<unnamed>'):
         self._count += 1
         self._usages += 1
         self._names.append(name)
diff --git a/relnotes/6.5 b/relnotes/6.5
--- a/relnotes/6.5
+++ b/relnotes/6.5
@@ -1,3 +1,13 @@
+= Mercurial 6.5.2 =
+
+ * hgweb: encode WSGI environment using the ISO-8859-1 codec
+ * rhg: fix the bug where sparse config is interpreted as relglob instead of glob
+ * gpg: fix an UnboundLocalError whenever using --force
+ * transaction: fix __repr__() and make the default name bytes
+ * setup: make the error "Unable to find a working hg binary" more informative
+ * tests: avoid test environment affecting setup.py
+ * run-tests: detect HGWITHRUSTEXT value
+
 = Mercurial 6.5.1 =
 
  * A bunch of improvements to Python 3.12 compatibility
diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -278,28 +278,44 @@ def findhg():
     # gives precedence to hg.exe in the current directory, so fall back to the
     # python invocation of local hg, where pythonXY.dll can always be found.
     check_cmd = ['log', '-r.', '-Ttest']
-    if os.name != 'nt' or not os.path.exists("hg.exe"):
+    attempts = []
+
+    def attempt(cmd, env):
         try:
             retcode, out, err = runcmd(hgcmd + check_cmd, hgenv)
-        except EnvironmentError:
-            retcode = -1
-        if retcode == 0 and not filterhgerr(err):
+            res = (True, retcode, out, err)
+            if retcode == 0 and not filterhgerr(err):
+                return True
+        except EnvironmentError as e:
+            res = (False, e)
+        attempts.append((cmd, res))
+        return False
+
+    if os.name != 'nt' or not os.path.exists("hg.exe"):
+        if attempt(hgcmd + check_cmd, hgenv):
             return hgcommand(hgcmd, hgenv)
 
     # Fall back to trying the local hg installation.
     hgenv = localhgenv()
     hgcmd = [sys.executable, 'hg']
-    try:
-        retcode, out, err = runcmd(hgcmd + check_cmd, hgenv)
-    except EnvironmentError:
-        retcode = -1
-    if retcode == 0 and not filterhgerr(err):
+    if attempt(hgcmd + check_cmd, hgenv):
         return hgcommand(hgcmd, hgenv)
 
     eprint("/!\\")
     eprint(r"/!\ Unable to find a working hg binary")
-    eprint(r"/!\ Version cannot be extract from the repository")
+    eprint(r"/!\ Version cannot be extracted from the repository")
     eprint(r"/!\ Re-run the setup once a first version is built")
+    eprint(r"/!\ Attempts:")
+    for i, e in enumerate(attempts):
+        eprint(r"/!\   attempt #%d:" % (i))
+        eprint(r"/!\     cmd:        ", e[0])
+        res = e[1]
+        if res[0]:
+            eprint(r"/!\     return code:", res[1])
+            eprint("/!\\     std output:\n%s" % (res[2].decode()), end="")
+            eprint("/!\\     std error:\n%s" % (res[3].decode()), end="")
+        else:
+            eprint(r"/!\     exception:  ", res[1])
     return None
 
 
diff --git a/tests/run-tests.py b/tests/run-tests.py
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -165,6 +165,7 @@ def _bytes2sys(p):
     return p.decode('utf-8')
 
 
+original_env = os.environ.copy()
 osenvironb = getattr(os, 'environb', None)
 if osenvironb is None:
     # Windows lacks os.environb, for instance.  A proxy over the real thing
@@ -3770,7 +3771,7 @@ class TestRunner:
         makedirs(self._bindir)
 
         vlog("# Running", cmd.decode("utf-8"))
-        if subprocess.call(_bytes2sys(cmd), shell=True) == 0:
+        if subprocess.call(_bytes2sys(cmd), shell=True, env=original_env) == 0:
             if not self.options.verbose:
                 try:
                     os.remove(installerrs)