pkg/dev_compiler/lib/js/legacy/dart_sdk.js

Index: pkg/dev_compiler/lib/js/legacy/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/legacy/dart_sdk.js b/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
index 751f1e827766804a6221de4f123e1dc82537c72c..029beee516efc323f3e97f020a2f380247bb2e90 100644
--- a/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
@@ -1781,7 +1781,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     if (actuals.length < type.args.length) return false;
     let index = 0;
     for (let i = 0; i < type.args.length; ++i) {
-      if (!dart.instanceOfOrNull(actuals[i], type.args[i])) return false;
+      dart.check(actuals[i], type.args[i]);
       ++index;
     }
     if (actuals.length == type.args.length) return true;
@@ -1789,7 +1789,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
     if (type.optionals.length > 0) {
       if (extras > type.optionals.length) return false;
       for (let i = 0, j = index; i < extras; ++i, ++j) {
-        if (!dart.instanceOfOrNull(actuals[j], type.optionals[i])) return false;
+        dart.check(actuals[j], type.optionals[i]);
       }
       return true;
     }
@@ -1802,7 +1802,7 @@ dart_library.library('dart_sdk', null, /* Imports */[
       if (!dart.hasOwnProperty.call(type.named, name)) {
         return false;
       }
-      if (!dart.instanceOfOrNull(opts[name], type.named[name])) return false;
+      dart.check(opts[name], type.named[name]);
     }
     return true;
   };