Second round of cleanups for new optional parameter semantics.

tests/compiler/dart2js/compiler_helper.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.
 // Test constant folding.
 
 #library("compiler_helper");
 
 #import("dart:uri");
 
 #import("../../../lib/compiler/implementation/elements/elements.dart", prefix: "lego");
 #import("../../../lib/compiler/implementation/js_backend/js_backend.dart", prefix: "js");
 #import("../../../lib/compiler/implementation/leg.dart", prefix: "leg");
 #import("../../../lib/compiler/implementation/ssa/ssa.dart", prefix: "ssa");
 #import("../../../lib/compiler/implementation/util/util.dart");
 #import('../../../lib/compiler/implementation/source_file.dart');
 
 #import("mock_compiler.dart");
 #import("parser_helper.dart");
 
-String compile(String code, [String entry = 'main',
-                             bool enableTypeAssertions = false,
-                             bool minify = false]) {
+String compile(String code, {String entry: 'main',
+                             bool enableTypeAssertions: false,
+                             bool minify: false}) {
   MockCompiler compiler =
       new MockCompiler(enableTypeAssertions: enableTypeAssertions,
                        enableMinification: minify);
   compiler.parseScript(code);
   lego.Element element = compiler.mainApp.find(buildSourceString(entry));
   if (element === null) return null;
   compiler.backend.enqueueHelpers(compiler.enqueuer.resolution);
   compiler.processQueue(compiler.enqueuer.resolution, element);
   var context = new js.JavaScriptItemCompilationContext();
   leg.WorkItem work = new leg.WorkItem(element, null, context);
@@ skipping 44 matching lines @@
 
 bool checkNumberOfMatches(Iterator it, int nb) {
   for (int i = 0; i < nb; i++) {
     Expect.isTrue(it.hasNext(), "Found less than $nb matches");
     it.next();
   }
   Expect.isFalse(it.hasNext(), "Found more than $nb matches");
 }
 
 void compileAndMatch(String code, String entry, RegExp regexp) {
-  String generated = compile(code, entry);
+  String generated = compile(code, entry: entry);
   Expect.isTrue(regexp.hasMatch(generated),
                 '"$generated" does not match /$regexp/');
 }
 
 void compileAndDoNotMatch(String code, String entry, RegExp regexp) {
-  String generated = compile(code, entry);
+  String generated = compile(code, entry: entry);
   Expect.isFalse(regexp.hasMatch(generated),
                  '"$generated" has a match in /$regexp/');
 }
 
 int length(Link link) => link.isEmpty() ? 0 : length(link.tail) + 1;
 
 // Does a compile and then a match where every 'x' is replaced by something
 // that matches any variable, and every space is optional.
 void compileAndMatchFuzzy(String code, String entry, String regexp) {
   compileAndMatchFuzzyHelper(code, entry, regexp, true);
 }
  
 void compileAndDoNotMatchFuzzy(String code, String entry, String regexp) {
   compileAndMatchFuzzyHelper(code, entry, regexp, false);
 }
 
 void compileAndMatchFuzzyHelper(
     String code, String entry, String regexp, bool shouldMatch) {
-  String generated = compile(code, entry);
+  String generated = compile(code, entry: entry);
   final xRe = new RegExp('\\bx\\b');
   regexp = regexp.replaceAll(xRe, '(?:$anyIdentifier)');
   final spaceRe = new RegExp('\\s+');
   regexp = regexp.replaceAll(spaceRe, '(?:\\s*)');
   if (shouldMatch) {
     Expect.isTrue(new RegExp(regexp).hasMatch(generated));
   } else {
     Expect.isFalse(new RegExp(regexp).hasMatch(generated));
   }
 }