Treat our type objects as core.Type

lib/runtime/dart_runtime.js

Index: lib/runtime/dart_runtime.js
diff --git a/lib/runtime/dart_runtime.js b/lib/runtime/dart_runtime.js
index 3e9d6baad776f3e51fff074dbb3496224f50b61f..afdc95223359c50929e8065d62ab201e2cc8a5a7 100644
--- a/lib/runtime/dart_runtime.js
+++ b/lib/runtime/dart_runtime.js
@@ -61,7 +61,7 @@ var dart, _js_helper;
       // Grab the `call` method if it's not a function.
       if (f !== null) f = f.call;
       if (!(f instanceof Function)) {
-        throwNoSuchMethod(obj, method, args);
+        throwNoSuchMethod(obj, name, args);
       }
     }
     // TODO(jmesserly): enable this when we can fix => and methods.
@@ -207,7 +207,15 @@ var dart, _js_helper;
     } else {
       subtypeMap.set(t1, map = new Map());
     }
-    map.set(t2, result = isSubtype_(t1, t2));
+    if (t2 == core.Type) {
+      // Special case Types.
+      result = t1.prototype instanceof core.Type ||

[Jennifer Messerly, 2015/04/24 00:43:14]

any reason not to include this in isSubtype_ ? I was trying to keep that one as
the "real" method, with this one just being the memoize glue

[vsm, 2015/04/24 13:25:44]

Yes - the helper is recursive with t2 staying constant, so we'd be repeating
this check every time.

+        t1 instanceof AbstractFunctionType ||
+        isSubtype_(t1, t2);
+    } else {
+      result = isSubtype_(t1, t2)
+    }
+    map.set(t2, result);
     return result;
   }
   dart.isSubtype = isSubtype;