Index: Lib/test/test_traceback.py
===================================================================
--- Lib/test/test_traceback.py	(revision 62160)
+++ Lib/test/test_traceback.py	(working copy)
@@ -75,6 +75,24 @@
         err = traceback.format_exception_only(None, None)
         self.assertEqual(err, ['None\n'])
 
+    def test_lineno(self):
+        import tempfile, sys, subprocess, os
+        def do_test(line):
+            handle, path = tempfile.mkstemp()
+            os.fdopen(handle, "w").write("""%s
+import sys, traceback
+try:
+	raise RuntimeError("foo")
+except:
+	sys.exit(traceback.tb_lineno(sys.exc_info()[2]))
+else:
+	sys.exit(0)
+""" % line)
+            self.assertEqual(subprocess.call([sys.executable, path]), 4)
+            os.remove(path)
+        do_test("")
+        do_test("# coding: utf-8")
+        do_test("# coding: ascii")
 
 def test_main():
     run_unittest(TracebackCases)