Addressing Mads' comments from http://codereview.chromium.org/3585010/show.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index c8dd07ff4f986c77285ee5bb900090bc523464ac..8058bffc7939dd97abbf3511cf6148047e2a3f50 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -11715,4 +11715,11 @@ TEST(RegExp) {
 
   context->Global()->Set(v8_str("re"), re);
   ExpectTrue("re.test('FoobarbaZ')");
+
+  v8::TryCatch try_catch;
+  re = v8::RegExp::New(v8_str("foo["), v8::RegExp::kNone);
+  CHECK(re.IsEmpty());
+  CHECK(try_catch.HasCaught());
+  context->Global()->Set(v8_str("ex"), try_catch.Exception());
+  ExpectTrue("ex instanceof SyntaxError");
 }