Suppress assert dialogs in test_cmd_line.
diff --git a/Lib/test/test_cmd_line.py b/Lib/test/test_cmd_line.py
index ebe557e..abaf3bb 100644
--- a/Lib/test/test_cmd_line.py
+++ b/Lib/test/test_cmd_line.py
@@ -340,7 +340,8 @@
# Issue #5319: if stdout.flush() fails at shutdown, an error should
# be printed out.
code = """if 1:
- import os, sys
+ import os, sys, test.support
+ test.support.SuppressCrashReport().__enter__()
sys.stdout.write('x')
os.close(sys.stdout.fileno())"""
rc, out, err = assert_python_ok('-c', code)