Remove AsyncError with Expando.

tests/standalone/io/file_invalid_arguments_test.dart

 // Copyright (c) 2013, 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 "package:expect/expect.dart";
 import "dart:io";
 import "dart:isolate";
 
 void testReadInvalidArgs(arg) {
   var port = new ReceivePort();
   String filename = getFilename("tests/vm/data/fixed_length_file");
   var file = (new File(filename)).openSync();
   try {
     file.readSync(arg);
     Expect.fail('exception expected');
   } catch (e) {
     Expect.isTrue(e is FileIOException);
     Expect.isTrue(e.toString().contains('Invalid arguments'));
   }
 
   var errors = 0;
   var readFuture = file.read(arg);
   readFuture.then((bytes) {
     Expect.fail('exception expected');
-  }).catchError((e) {
+  }).catchError((error) {
     errors++;
-    Expect.isTrue(e.error is FileIOException);
-    Expect.isTrue(e.error.toString().contains('Invalid arguments'));
+    Expect.isTrue(error is FileIOException);
+    Expect.isTrue(error.toString().contains('Invalid arguments'));
     file.close().then((ignore) {
       Expect.equals(1, errors);
       port.close();
     });
   });
 }
 
 void testReadIntoInvalidArgs(buffer, start, end) {
   var port = new ReceivePort();
   String filename = getFilename("tests/vm/data/fixed_length_file");
   var file = (new File(filename)).openSync();
   try {
     file.readIntoSync(buffer, start, end);
     Expect.fail('exception expected');
   } catch (e) {
     Expect.isTrue(e is FileIOException);
     Expect.isTrue(e.toString().contains('Invalid arguments'));
   }
 
   var errors = 0;
   var readIntoFuture = file.readInto(buffer, start, end);
   readIntoFuture.then((bytes) {
     Expect.fail('exception expected');
-  }).catchError((e) {
+  }).catchError((error) {
     errors++;
-    Expect.isTrue(e.error is FileIOException);
-    Expect.isTrue(e.error.toString().contains('Invalid arguments'));
+    Expect.isTrue(error is FileIOException);
+    Expect.isTrue(error.toString().contains('Invalid arguments'));
     file.close().then((ignore) {
       Expect.equals(1, errors);
       port.close();
     });
   });
 }
 
 void testWriteByteInvalidArgs(value) {
   var port = new ReceivePort();
   String filename = getFilename("tests/vm/data/fixed_length_file");
   var file = (new File("${filename}_out")).openSync(mode: FileMode.WRITE);
   try {
     file.writeByteSync(value);
     Expect.fail('exception expected');
   } catch (e) {
     Expect.isTrue(e is FileIOException);
     Expect.isTrue(e.toString().contains('Invalid argument'));
   }
 
   var writeByteFuture = file.writeByte(value);
   writeByteFuture.then((ignore) {
     Expect.fail('exception expected');
-  }).catchError((s) {
-    Expect.isTrue(s.error is FileIOException);
-    Expect.isTrue(s.error.toString().contains('Invalid argument'));
+  }).catchError((error) {
+    Expect.isTrue(error is FileIOException);
+    Expect.isTrue(error.toString().contains('Invalid argument'));
     file.close().then((ignore) {
       port.close();
     });
   });
 }
 
 void testWriteFromInvalidArgs(buffer, start, end) {
   var port = new ReceivePort();
   String filename = getFilename("tests/vm/data/fixed_length_file");
   var file = (new File("${filename}_out")).openSync(mode: FileMode.WRITE);
   try {
     file.writeFromSync(buffer, start, end);
     Expect.fail('exception expected');
   } catch (e) {
     Expect.isTrue(e is FileIOException);
     Expect.isTrue(e.toString().contains('Invalid arguments'));
   }
 
   var writeFromFuture = file.writeFrom(buffer, start, end);
   writeFromFuture.then((ignore) {
     Expect.fail('exception expected');
-  }).catchError((s) {
-    Expect.isTrue(s.error is FileIOException);
-    Expect.isTrue(s.error.toString().contains('Invalid arguments'));
+  }).catchError((error) {
+    Expect.isTrue(error is FileIOException);
+    Expect.isTrue(error.toString().contains('Invalid arguments'));
     file.close().then((ignore) {
       port.close();
     });
   });
 }
 
 void testWriteStringInvalidArgs(string, encoding) {
   var port = new ReceivePort();
   String filename = getFilename("tests/vm/data/fixed_length_file");
   var file = new File("${filename}_out").openSync(mode: FileMode.WRITE);
   try {
     file.writeStringSync(string, encoding: encoding);
     Expect.fail('exception expected');
   } catch (e) {
     Expect.isTrue(e is FileIOException);
   }
 
   var writeStringFuture = file.writeString(string, encoding: encoding);
   writeStringFuture.then((ignore) {
     Expect.fail('exception expected');
-  }).catchError((s) {
-    Expect.isTrue(s.error is FileIOException);
+  }).catchError((error) {
+    Expect.isTrue(error is FileIOException);
     file.close().then((ignore) {
       port.close();
     });
   });
 }
 
 String getFilename(String path) {
   return new File(path).existsSync() ? path : 'runtime/$path';
 }
 
 main() {
   testReadInvalidArgs('asdf');
   testReadIntoInvalidArgs(12, 0, 1);
   testReadIntoInvalidArgs(new List(10), '0', 1);
   testReadIntoInvalidArgs(new List(10), 0, '1');
   testWriteByteInvalidArgs('asdf');
   testWriteFromInvalidArgs(12, 0, 1);
   testWriteFromInvalidArgs(new List(10), '0', 1);
   testWriteFromInvalidArgs(new List(10), 0, '1');
   testWriteStringInvalidArgs("Hello, world", 42);
 }