Initial support for runtime function types and type checking

lib/runtime/dart/_interceptors.js

Index: lib/runtime/dart/_interceptors.js
diff --git a/lib/runtime/dart/_interceptors.js b/lib/runtime/dart/_interceptors.js
index 980d7e459a27f3d12d515d617a2ea241c363f29b..ea9e099d564eb5bfc268db8bae9674cd0f64b6c7 100644
--- a/lib/runtime/dart/_interceptors.js
+++ b/lib/runtime/dart/_interceptors.js
@@ -872,7 +872,7 @@ var _interceptors;
   function _symbolMapToStringMap(map) {
     if (map == null)
       return null;
-    let result = new (core.Map$(core.String, dynamic))();
+    let result = new (core.Map$(core.String, dart.dynamic))();
     map.forEach((key, value) => {
       result.set(_symbolToString(key), value);
     });