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lib/runtime/dart/async.js

Index: lib/runtime/dart/async.js
diff --git a/lib/runtime/dart/async.js b/lib/runtime/dart/async.js
index c628abee456bad0fa11c6197385d2df31eb36988..4a8cd82b41b06c37753d0057dcb5fcb5c73c02e7 100644
--- a/lib/runtime/dart/async.js
+++ b/lib/runtime/dart/async.js
@@ -5232,12 +5232,12 @@ dart_library.library('dart/async', null, /* Imports */[
       }
     }
     get(key) {
-      let result = this[_map].get(key);
-      if (result != null || dart.notNull(this[_map].containsKey(key))) return result;
+      let result = this[_map][dartx.get](key);
+      if (result != null || dart.notNull(this[_map][dartx.containsKey](key))) return result;
       if (this.parent != null) {
         let value = this.parent.get(key);
         if (value != null) {
-          this[_map].set(key, value);
+          this[_map][dartx.set](key, value);
         }
         return value;
       }