[PATCH 1 of 4] formatter: use stringutil.pprint() in debug output to drop b''

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1539492679 -7200
#      Sun Oct 14 06:51:19 2018 +0200
# Node ID b28a63d39d280a081a2de1f96c5c7276aef6a0e1
# Parent  8783710b1d58d2ccc0f611904af244a1dde214d4
formatter: use stringutil.pprint() in debug output to drop b''

diff --git a/mercurial/formatter.py b/mercurial/formatter.py
--- a/mercurial/formatter.py
+++ b/mercurial/formatter.py
@@ -129,7 +129,10 @@ from . import (
     templateutil,
     util,
 )
-from .utils import dateutil
+from .utils import (
+    dateutil,
+    stringutil,
+)
 
 pickle = util.pickle
 
@@ -321,7 +324,7 @@ class debugformatter(baseformatter):
         self._out = out
         self._out.write("%s = [\n" % self._topic)
     def _showitem(self):
-        self._out.write('    %s,\n' % pycompat.byterepr(self._item))
+        self._out.write('    %s,\n' % stringutil.pprint(self._item))
     def end(self):
         baseformatter.end(self)
         self._out.write("]\n")