Do not suppress implicit constructors that need a super call.

lib/runtime/dart/core.js

Index: lib/runtime/dart/core.js
diff --git a/lib/runtime/dart/core.js b/lib/runtime/dart/core.js
index e8aca91215771c4b2d4173bd71cc5cdc4cc6358c..7bbb0a3257301df662ade045adbfa1af7a9f88c4 100644
--- a/lib/runtime/dart/core.js
+++ b/lib/runtime/dart/core.js
@@ -559,10 +559,21 @@ var core;
       return _js_helper.Primitives.extractStackTrace(this);
     }
   }
-  class AssertionError extends Error {}
+  class AssertionError extends Error {
+    AssertionError() {
+      super.Error();
+    }
+  }
   class TypeError extends AssertionError {}
-  class CastError extends Error {}
+  class CastError extends Error {
+    CastError() {
+      super.Error();
+    }
+  }
   class NullThrownError extends Error {
+    NullThrownError() {
+      super.Error();
+    }
     toString() {
       return "Throw of null.";
     }