diff -r 317382151ac3 -r de117f579431 mercurial/logcmdutil.py
--- a/mercurial/logcmdutil.py	Sat Mar 17 11:23:04 2018 +0900
+++ b/mercurial/logcmdutil.py	Fri Mar 16 21:24:12 2018 +0900
@@ -33,7 +33,6 @@
     smartset,
     templatekw,
     templater,
-    templateutil,
     util,
 )
 from .utils import dateutil
@@ -450,15 +449,13 @@
             self._parts.update(m)
 
         if self._parts['docheader']:
-            self.ui.write(
-                templateutil.stringify(self.t(self._parts['docheader'])))
+            self.ui.write(self.t.render(self._parts['docheader'], {}))
 
     def close(self):
         if self._parts['docfooter']:
             if not self.footer:
                 self.footer = ""
-            self.footer += templateutil.stringify(
-                self.t(self._parts['docfooter']))
+            self.footer += self.t.render(self._parts['docfooter'], {})
         return super(changesettemplater, self).close()
 
     def _show(self, ctx, copies, props):
@@ -467,18 +464,16 @@
         props['ctx'] = ctx
         props['index'] = index = next(self._counter)
         props['revcache'] = {'copies': copies}
-        props = pycompat.strkwargs(props)
 
         # write separator, which wouldn't work well with the header part below
         # since there's inherently a conflict between header (across items) and
         # separator (per item)
         if self._parts['separator'] and index > 0:
-            self.ui.write(
-                templateutil.stringify(self.t(self._parts['separator'])))
+            self.ui.write(self.t.render(self._parts['separator'], {}))
 
         # write header
         if self._parts['header']:
-            h = templateutil.stringify(self.t(self._parts['header'], **props))
+            h = self.t.render(self._parts['header'], props)
             if self.buffered:
                 self.header[ctx.rev()] = h
             else:
@@ -488,13 +483,12 @@
 
         # write changeset metadata, then patch if requested
         key = self._parts[self._tref]
-        self.ui.write(templateutil.stringify(self.t(key, **props)))
+        self.ui.write(self.t.render(key, props))
         self._showpatch(ctx)
 
         if self._parts['footer']:
             if not self.footer:
-                self.footer = templateutil.stringify(
-                    self.t(self._parts['footer'], **props))
+                self.footer = self.t.render(self._parts['footer'], props)
 
 def templatespec(tmpl, mapfile):
     if mapfile: