Remove AsyncError with Expando.

tests/standalone/io/directory_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.
 //
 // Directory listing test.
 
 import "package:expect/expect.dart";
 import "dart:async";
 import "dart:io";
 import "dart:isolate";
@@ skipping 71 matching lines @@
     // Listing is asynchronous, so nothing should be listed at this
     // point.
     Expect.isFalse(listedDir);
     Expect.isFalse(listedFile);
   }
 
   static void testListNonExistent() {
     setupListerHandlers(Stream<FileSystemEntity> stream) {
       stream.listen(
           (_) => Expect.fail("Listing of non-existing directory should fail"),
-          onError: (e) {
-            Expect.isTrue(e is AsyncError);
-            Expect.isTrue(e.error is DirectoryIOException);
+          onError: (error) {
+            Expect.isTrue(error is DirectoryIOException);
           });
     }
     new Directory("").createTemp().then((d) {
       d.delete().then((ignore) {
         setupListerHandlers(d.list());
         setupListerHandlers(d.list(recursive: true));
       });
     });
   }
 
   static void testListTooLongName() {
     new Directory("").createTemp().then((d) {
       var errors = 0;
       var port = new ReceivePort();
       setupListHandlers(Stream<FileSystemEntity> stream) {
         stream.listen(
           (_) => Expect.fail("Listing of non-existing directory should fail"),
-          onError: (e) {
-            Expect.isTrue(e is AsyncError);
-            Expect.isTrue(e.error is DirectoryIOException);
+          onError: (error) {
+            Expect.isTrue(error is DirectoryIOException);
             if (++errors == 2) {
               d.delete(recursive: true).then((_) {
                 port.close();
               });
             }
           });
       }
       var subDirName = 'subdir';
       var subDir = new Directory("${d.path}/$subDirName");
       subDir.create().then((ignore) {
         // Construct a long string of the form
         // 'tempdir/subdir/../subdir/../subdir'.
         var buffer = new StringBuffer();
         buffer.write(subDir.path);
         for (var i = 0; i < 1000; i++) {
           buffer.write("/../${subDirName}");
         }
         var long = new Directory("${buffer.toString()}");
         setupListHandlers(long.list());
         setupListHandlers(long.list(recursive: true));
       });
     });
   }
 
   static void testDeleteNonExistent() {
     // Test that deleting a non-existing directory fails.
     setupFutureHandlers(future) {
       future.then((ignore) {
         Expect.fail("Deletion of non-existing directory should fail");
-      }).catchError((e) {
-        Expect.isTrue(e.error is DirectoryIOException);
+      }).catchError((error) {
+        Expect.isTrue(error is DirectoryIOException);
       });
     }
 
     new Directory("").createTemp().then((d) {
       d.delete().then((ignore) {
         setupFutureHandlers(d.delete());
         setupFutureHandlers(d.delete(recursive: true));
       });
     });
   }
 
   static void testDeleteTooLongName() {
     var port = new ReceivePort();
     new Directory("").createTemp().then((d) {
       var subDirName = 'subdir';
       var subDir = new Directory("${d.path}/$subDirName");
       subDir.create().then((ignore) {
           // Construct a long string of the form
           // 'tempdir/subdir/../subdir/../subdir'.
           var buffer = new StringBuffer();
           buffer.write(subDir.path);
           for (var i = 0; i < 1000; i++) {
             buffer.write("/../${subDirName}");
           }
           var long = new Directory("${buffer.toString()}");
           var errors = 0;
-          onError(e) {
-            Expect.isTrue(e.error is DirectoryIOException);
+          onError(error) {
+            Expect.isTrue(error is DirectoryIOException);
             if (++errors == 2) {
               d.delete(recursive: true).then((ignore) => port.close());
             }
             return true;
           }
           long.delete().catchError(onError);
           long.delete(recursive: true).catchError(onError);
         });
     });
   }
@@ skipping 364 matching lines @@
   // Test that creating an existing directory succeeds.
   var port = new ReceivePort();
   var d = new Directory('');
   d.createTemp().then((temp) {
     var path = '${temp.path}/flaf';
     var file = new File(path);
     var subDir = new Directory(path);
     file.create().then((_) {
       subDir.create()
         .then((_) { Expect.fail("dir create should fail on existing file"); })
-        .catchError((e) {
-          Expect.isTrue(e.error is DirectoryIOException);
+        .catchError((error) {
+          Expect.isTrue(error is DirectoryIOException);
           temp.delete(recursive: true).then((_) {
             port.close();
           });
         });
     });
   });
 }
 
 
 testCreateRecursiveSync() {
@@ skipping 47 matching lines @@
   testCreateTempErrorSync();
   testCreateTempError();
   testCreateExistingSync();
   testCreateExisting();
   testCreateDirExistingFileSync();
   testCreateDirExistingFile();
   testCreateRecursive();
   testCreateRecursiveSync();
   testRename();
 }