diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2224,8 +2224,8 @@
         if t == b'path':
             ui.debug(b'read config from: %s\n' % f)
         elif t == b'items':
-            for section, name, value, source in f:
-                ui.debug(b'set config by: %s\n' % source)
+            # Don't print anything for 'items'.
+            pass
         else:
             raise error.ProgrammingError(b'unknown rctype: %s' % t)
     untrusted = bool(opts.get(b'untrusted'))
diff --git a/tests/test-hgrc.t b/tests/test-hgrc.t
--- a/tests/test-hgrc.t
+++ b/tests/test-hgrc.t
@@ -197,9 +197,6 @@
 with environment variables
 
   $ PAGER=p1 EDITOR=e1 VISUAL=e2 hg showconfig --debug
-  set config by: $EDITOR
-  set config by: $VISUAL
-  set config by: $PAGER
   read config from: $TESTTMP/hgrc
   repo: bundle.mainreporoot=$TESTTMP
   $PAGER: pager.pager=p1