[dart2dart] Optionally cut types in variable declarations:

tests/compiler/dart2js/unparser_test.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.
 
 #import('dart:uri');
 #import('parser_helper.dart');
 #import('mock_compiler.dart');
 #import("../../../lib/compiler/compiler.dart");
 #import("../../../lib/compiler/implementation/leg.dart", prefix:'leg');
 #import("../../../lib/compiler/implementation/dart_backend/dart_backend.dart");
@@ skipping 29 matching lines @@
 }
 ''';
 
 const ioLib = @'''
 #library('io');
 class Platform {
   static int operatingSystem;
 }
 ''';
 
-testDart2Dart(String src, [void continuation(String s), bool minify = false]) {
+testDart2Dart(String src, [void continuation(String s), bool minify = false,
+    bool cutDeclarationTypes = false]) {
   // If continuation is not provided, check that source string remains the same.
   if (continuation === null) {
     continuation = (s) { Expect.equals(src, s); };
   }
-  testDart2DartWithLibrary(src, '', continuation, minify);
+  testDart2DartWithLibrary(src, '', continuation, minify, cutDeclarationTypes);
 }
 
 /**
  * Library name is assumed to be 'mylib' in 'mylib.dart' file.
  */
 testDart2DartWithLibrary(
     String srcMain, String srcLibrary,
-    [void continuation(String s), bool minify = false]) {
+    [void continuation(String s), bool minify = false,
+    bool cutDeclarationTypes = false]) {
   fileUri(path) => new Uri.fromComponents(scheme: 'file', path: path);
 
   final scriptUri = fileUri('script.dart');
   final libUri = fileUri('mylib.dart');
 
   provider(uri) {
     if (uri == scriptUri) return new Future.immediate(srcMain);
     if (uri.toString() == libUri.toString()) {
       return new Future.immediate(srcLibrary);
     }
     if (uri.path.endsWith('/core.dart')) return new Future.immediate(coreLib);
     if (uri.path.endsWith('/io.dart')) return new Future.immediate(ioLib);
     return new Future.immediate('');
   }
 
   handler(uri, begin, end, message, kind) {
     if (kind === Diagnostic.ERROR || kind === Diagnostic.CRASH) {
       Expect.fail('$uri: $begin-$end: $message [$kind]');
     }
   }
 
   final options = <String>['--output-type=dart'];
   if (minify) options.add('--minify');
+  if (cutDeclarationTypes) options.add('--cutDeclarationTypes');
 
   compile(
       scriptUri,
       fileUri('libraryRoot'),
       fileUri('packageRoot'),
       provider,
       handler,
       options).then(continuation);
 }
 
@@ skipping 677 matching lines @@
 ''';
   var expectedResult =
     'interface Iterable<K>{}'
     'interface Link<T> extends Iterable<T> default LinkFactory<T>{Link();}'
     'class LinkFactory<T>{factory Link(){}}'
     'main(){new Link<int>();}';
   testDart2DartWithLibrary(mainSrc, librarySrc,
       (String result) { Expect.equals(expectedResult, result); });
 }
 
+testDeclarationTypePlaceholders() {
+  var src = '''
+String globalfield;
+const String globalconstfield;
+
+void foo(String arg) {}
+
+main() {
+  String localvar;
+  foo("5");
+}
+''';
+  var expectedResult =
+      ' foo( arg){}main(){var localvar; foo("5");}';
+  testDart2Dart(src,
+      (String result) { Expect.equals(expectedResult, result); },
+      cutDeclarationTypes: true);
+}
+
 main() {
   testSignedConstants();
   testGenericTypes();
   testForLoop();
   testEmptyList();
   testClosure();
   testIndexedOperatorDecl();
   testNativeMethods();
   testPrefixIncrements();
   testConstModifier();
@@ skipping 21 matching lines @@
   testTypeVariablesAreRenamed();
   testClassTypeArgumentBound();
   testDoubleMains();
   testInterfaceDefaultAnotherLib();
   testStaticAccessIoLib();
   testLocalFunctionPlaceholder();
   testMinification();
   testClosureLocalsMinified();
   testParametersMinified();
   testTypeVariablesInDifferentLibraries();
+  testDeclarationTypePlaceholders();
 }