Always mark stdout as blocking when using 'print'.

tests/standalone/io/print_sync_script.dart

Index: tests/standalone/io/print_sync_script.dart
diff --git a/tests/standalone/io/print_sync_script.dart b/tests/standalone/io/print_sync_script.dart
new file mode 100644
index 0000000000000000000000000000000000000000..752875b990ffedbcc6a2a8eb9fca25d9cfeb1eae
--- /dev/null
+++ b/tests/standalone/io/print_sync_script.dart
@@ -0,0 +1,22 @@
+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'dart:io';
+
+String get bigString {
+  var buffer = new StringBuffer();
+  for (var i = 0; i < 1000; i++) {
+    buffer.write(i);
+    for (var i = 0; i < 200; i++) {
+      buffer.write('=');
+    }
+    buffer.writeln();
+  }
+  return buffer.toString();
+}
+
+main() {
+  stdout;  // Be sure too mark stdout as non-blocking.

[karlklose, 2013/10/01 09:13:45]

'too' -> 'to'.

[Anders Johnsen, 2013/10/01 09:16:56]

Done.

+  print(bigString);
+}