a === b -> identical(a, b)

sdk/lib/_internal/compiler/implementation/resolution/members.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 resolution;
 
 abstract class TreeElements {
   Element operator[](Node node);
   Selector getSelector(Send send);
   DartType getType(Node node);
@@ skipping 1454 matching lines @@
       name = const SourceString("");
     } else {
       name = node.name.asIdentifier().source;
     }
 
     FunctionElement function = new FunctionElement.node(
         name, node, ElementKind.FUNCTION, Modifiers.EMPTY,
         enclosingElement);
     Scope oldScope = scope; // The scope is modified by [setupFunction].
     setupFunction(node, function);
-    defineElement(node, function, doAddToScope: node.name !== null);
+    defineElement(node, function, doAddToScope: node.name != null);
 
     Element previousEnclosingElement = enclosingElement;
     enclosingElement = function;
     // Run the body in a fresh statement scope.
     StatementScope oldStatementScope = statementScope;
     statementScope = new StatementScope();
     visit(node.body);
     statementScope = oldStatementScope;
 
     scope = oldScope;
@@ skipping 1584 matching lines @@
     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }