Treat negative utf8-units the same way as other broken encodings.

tests/lib/convert/utf82_test.dart

Index: tests/lib/convert/utf82_test.dart
diff --git a/tests/lib/convert/utf82_test.dart b/tests/lib/convert/utf82_test.dart
index b52f240ccdabc98b5a1f2b75c9ab6d4c92aa1fb7..bdcf5a9391f39b7f1841d8ab52e4378699693085 100644
--- a/tests/lib/convert/utf82_test.dart
+++ b/tests/lib/convert/utf82_test.dart
@@ -50,7 +50,10 @@ final TESTS = [
   [ 0xC0, 0x80 ],
   [ 0xC1, 0x80 ],
   // Outside valid range.
-  [ 0xF4, 0xBF, 0xBF, 0xBF ]];
+  [ 0xF4, 0xBF, 0xBF, 0xBF ],
+  // Negative
+  [ -0x01 ],
+  [ -0xFF ]];

[Lasse Reichstein Nielsen, 2013/08/22 06:10:42]

Try also:
-0x80000000  (min int32)
-0x40000000  (min smi)
-0x80000000000000000 (some bigint)

[floitsch, 2013/08/22 15:40:25]

Done.

 
 final TESTS2 = [
   // Test that 0xC0|1, 0x80 does not eat the next character.