diff -r a22ef88143b9 Lib/test/test_trace.py
--- a/Lib/test/test_trace.py	Sat Oct 25 23:05:21 2014 -0500
+++ b/Lib/test/test_trace.py	Thu Oct 30 00:09:21 2014 +0700
@@ -1,6 +1,7 @@
 import os
 import io
 import sys
+from test.script_helper import assert_python_ok, assert_python_failure
 from test.support import (run_unittest, TESTFN, rmtree, unlink,
                                captured_stdout)
 import unittest
@@ -411,6 +412,22 @@
             trace.find_executable_linenos(fd.name)
 
 
+class TestCommandLine(unittest.TestCase):
+
+    def test_listfuncs_flag_failure(self):
+        ok, stdout, stderr = assert_python_failure('-m', 'trace', '-l')
+        stderr = stderr.rstrip()
+        self.assertIn(b'missing name of file to run', stderr)
+
+    def test_listfuncs_flag_success(self):
+        with open(TESTFN, 'w') as fd:
+            self.addCleanup(unlink, TESTFN)
+            fd.write("a = 1\n")
+            ok, stdout, stderr = assert_python_ok('-m', 'trace', '-l', TESTFN)
+            stdout = stdout.rstrip()
+            self.assertIn(b'functions called:', stdout)
+
+
 def test_main():
     run_unittest(__name__)
 
diff -r a22ef88143b9 Lib/trace.py
--- a/Lib/trace.py	Sat Oct 25 23:05:21 2014 -0500
+++ b/Lib/trace.py	Thu Oct 30 00:09:21 2014 +0700
@@ -773,7 +773,7 @@
     if report and not counts_file:
         _err_exit("--report requires a --file")
 
-    if no_report and len(prog_argv) == 0:
+    if (no_report or listfuncs) and len(prog_argv) == 0:
         _err_exit("missing name of file to run")
 
     # everything is ready