# HG changeset patch
# User Steve Dower <steve.dower@microsoft.com>
# Date 1443903753 25200
#      Sat Oct 03 13:22:33 2015 -0700
# Branch 3.5
# Node ID cd0337815d8deeb2cf7b8992eefbb7744f3c8721
# Parent  e0db10d8c95e178ed5a1cff37fc6aecd24662178
Issue #23919: Prevents assert dialogs appearing in the test suite.

diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -511,7 +511,13 @@
         import gc
         gc.set_threshold(ns.threshold)
     if ns.nowindows:
+        print('The --nowindows (-n) option is deprecated. '
+              'Use -vv to display assertions in stderr.')
+    try:
         import msvcrt
+    except ImportError:
+        pass
+    else:
         msvcrt.SetErrorMode(msvcrt.SEM_FAILCRITICALERRORS|
                             msvcrt.SEM_NOALIGNMENTFAULTEXCEPT|
                             msvcrt.SEM_NOGPFAULTERRORBOX|
@@ -523,8 +529,11 @@
             pass
         else:
             for m in [msvcrt.CRT_WARN, msvcrt.CRT_ERROR, msvcrt.CRT_ASSERT]:
-                msvcrt.CrtSetReportMode(m, msvcrt.CRTDBG_MODE_FILE)
-                msvcrt.CrtSetReportFile(m, msvcrt.CRTDBG_FILE_STDERR)
+                if ns.verbose and ns.verbose >= 2:
+                    msvcrt.CrtSetReportMode(m, msvcrt.CRTDBG_MODE_FILE)
+                    msvcrt.CrtSetReportFile(m, msvcrt.CRTDBG_FILE_STDERR)
+                else:
+                    msvcrt.CrtSetReportMode(m, 0)
     if ns.wait:
         input("Press any key to continue...")