Runtime support for the new parameter specification.

lib/compiler/implementation/js_backend/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.
 
 /**
  * A function element that represents a closure call. The signature is copied
  * from the given element.
  */
 class ClosureInvocationElement extends FunctionElement {
   ClosureInvocationElement(SourceString name,
@@ skipping 345 matching lines @@
         namer.instanceMethodInvocationName(member.getLibrary(), member.name,
                                            selector);
     CodeBuffer buffer = new CodeBuffer();
     buffer.add('function(');
 
     // The parameters that this stub takes.
     List<String> parametersBuffer = new List<String>(selector.argumentCount);
     // The arguments that will be passed to the real method.
     List<String> argumentsBuffer = new List<String>(parameters.parameterCount);
 
+    // TODO(5074): Update this comment once we remove support for
+    // the deprecated parameter specification.
     // We fill the lists depending on the selector. For example,
     // take method foo:
     //    foo(a, b, [c, d]);
     //
     // We may have multiple ways of calling foo:
     // (1) foo(1, 2, 3, 4)
     // (2) foo(1, 2);
     // (3) foo(1, 2, 3);
     // (4) foo(1, 2, c: 3);
     // (5) foo(1, 2, d: 4);
@@ skipping 961 matching lines @@
 const String HOOKS_API_USAGE = """
 // Generated by dart2js, the Dart to JavaScript compiler.
 // The code supports the following hooks:
 // dartPrint(message)   - if this function is defined it is called
 //                        instead of the Dart [print] method.
 // dartMainRunner(main) - if this function is defined, the Dart [main]
 //                        method will not be invoked directly.
 //                        Instead, a closure that will invoke [main] is
 //                        passed to [dartMainRunner].
 """;