Ensure that failure to start an isolate all end up in the future.

tests/isolate/isolate_create_error_helper_syntax_error.dart

Index: tests/isolate/isolate_create_error_helper_syntax_error.dart
diff --git a/tests/language/regress_18865_test.dart b/tests/isolate/isolate_create_error_helper_syntax_error.dart
similarity index 56%
copy from tests/language/regress_18865_test.dart
copy to tests/isolate/isolate_create_error_helper_syntax_error.dart
index ba64c4c9f51fff6ae2bc2e4f1605a8c0808ef472..bcd886e9fcd623be07abe757fbc0722e58ded47b 100644
--- a/tests/language/regress_18865_test.dart
+++ b/tests/isolate/isolate_create_error_helper_syntax_error.dart
@@ -2,14 +2,11 @@
 // 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.
 
-// Regression test for issue 18865.
+library isolate.create.error_helper_syntax_error;
 
-class B<T> { }
+// This library has a syntax error, and fails to load.
 
-class A<T> extends B {
-  static foo() => new A();
-}
+public static void main() {
+  print("MUST NOT BE PRINTED");
+};
 
-main () {
-  A.foo();
-}