diff -r 2082c7891058 Lib/trace.py
--- a/Lib/trace.py	Tue Jul 20 06:36:31 2010 +0300
+++ b/Lib/trace.py	Wed Jul 21 12:23:17 2010 +0300
@@ -799,12 +799,9 @@
                   ignoredirs=ignore_dirs, infile=counts_file,
                   outfile=counts_file, timing=timing)
         try:
-            fp = open(progname)
-            try:
-                script = fp.read()
-            finally:
-                fp.close()
-            t.run('exec(%r)' % (script,))
+            with open(progname) as fp:
+                code = compile(fp.read(), progname, 'exec')
+                t.run(code)
         except IOError as err:
             _err_exit("Cannot run file %r because: %s" % (sys.argv[0], err))
         except SystemExit: