Make a VM crash more obvious.

dart/tools/test.py

Index: dart/tools/test.py
diff --git a/dart/tools/test.py b/dart/tools/test.py
index 51f945d9cf923973ae3b12ce9bebd89f3bc76fef..2dc7279e9b8a7f4156f15d9c33e46785296639dc 100755
--- a/dart/tools/test.py
+++ b/dart/tools/test.py
@@ -9,16 +9,17 @@ import string
 import subprocess
 import sys
 
-from utils import GuessOS
+import utils
+
 
 def Main():
   args = sys.argv[1:]
   tools_dir = os.path.dirname(os.path.realpath(__file__))
   dart_binary_prefix = os.path.join(tools_dir, 'testing', 'bin')
-  if GuessOS() == "win32":
+  if utils.IsWindows():
     dart_binary = os.path.join(dart_binary_prefix, 'windows', 'dart.exe')
   else:
-    dart_binary = os.path.join(dart_binary_prefix, GuessOS(), 'dart')
+    dart_binary = os.path.join(dart_binary_prefix, utils.GuessOS(), 'dart')
   current_directory = os.path.abspath('');
   client = os.path.abspath(os.path.join(tools_dir, '..'));
   if current_directory == os.path.join(client, 'runtime'):
@@ -29,7 +30,10 @@ def Main():
     dart_script_name = 'test.dart'
   dart_test_script = string.join([tools_dir, dart_script_name], os.sep)
   command = [dart_binary, dart_test_script] + args
-  return subprocess.call(command)
+  exit_code = subprocess.call(command)
+  utils.DiagnoseExitCode(exit_code, command)
+  return exit_code
+
 
 if __name__ == '__main__':
   sys.exit(Main())