Make instance methods whose names collide with intercepted methods have the interceptor calling con…

sdk/lib/_internal/compiler/implementation/js_backend/native_emitter.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of js_backend;
 
 class NativeEmitter {
 
   CodeEmitterTask emitter;
   CodeBuffer nativeBuffer;
@@ skipping 466 matching lines @@
         if (!requiresNativeIsCheck(element)) continue;
         if (element.isObject(compiler)) continue;
         String name = backend.namer.operatorIs(element);
         addProperty(name,
             js.fun([], js.return_(js['false'])));
       }
     }
     emitIsChecks();
 
     jsAst.Expression makeCallOnThis(String functionName) {
-      return js.fun([], js.return_(js['$functionName(this)']));
+      // Because we know the function is intercepted, we need an extra
+      // parameter.
+      return js.fun(['_'], js.return_(js['$functionName(this)']));
     }
 
     // In order to have the toString method on every native class,
     // we must patch the JS Object prototype with a helper method.
     String toStringName = backend.namer.publicInstanceMethodNameByArity(
         const SourceString('toString'), 0);
     addProperty(toStringName, makeCallOnThis(toStringHelperName));
 
     // Same as above, but for hashCode.
     String hashCodeName =
         backend.namer.publicGetterName(const SourceString('hashCode'));
     addProperty(hashCodeName, makeCallOnThis(hashCodeHelperName));
 
     // Same as above, but for operator==.
     String equalsName = backend.namer.publicInstanceMethodNameByArity(
         const SourceString('=='), 1);
-    addProperty(equalsName, js.fun(['a'],
+    // Because we know the function is intercepted, we need an extra
+    // parameter.
+    addProperty(equalsName, js.fun(['_', 'a'],
         js.return_(js['this === a'])));
 
     // If the native emitter has been asked to take care of the
     // noSuchMethod handlers, we do that now.
     if (handleNoSuchMethod) {
       emitter.emitNoSuchMethodHandlers(addProperty);
     }
 
     // If we have any properties to add to Object.prototype, we run
     // through them and add them using defineProperty.
@@ skipping 13 matching lines @@
       if (emitter.compiler.enableMinification) targetBuffer.add(';');
       targetBuffer.add(jsAst.prettyPrint(
           new jsAst.ExpressionStatement(init), compiler));
       targetBuffer.add('\n');
     }
 
     targetBuffer.add(nativeBuffer);
     targetBuffer.add('\n');
   }
 }