Fuzzing of dart:io Directory API.

runtime/bin/directory_impl.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.
 
 
 class _Directory implements Directory {
   static final kCreateRequest = 0;
   static final kDeleteRequest = 1;
   static final kExistsRequest = 2;
   static final kCreateTempRequest = 3;
@@ skipping 226 matching lines @@
           break;
         case kListError:
           var errorType =
               message[kResponseError][_FileUtils.kErrorResponseErrorType];
           if (errorType == _FileUtils.kIllegalArgumentResponse) {
             _reportError(new IllegalArgumentException());
           } else if (errorType == _FileUtils.kOSErrorResponse) {
             var err = new OSError(
                 message[kResponseError][_FileUtils.kOSErrorResponseMessage],
                 message[kResponseError][_FileUtils.kOSErrorResponseErrorCode]);
+            var errorPath = message[kResponsePath];
+            if (errorPath == null) errorPath = path;
             _reportError(new DirectoryIOException("Directory listing failed",
-                                              message[kResponsePath],
-                                              err));
+                                                  errorPath,
+                                                  err));
           } else {
             _reportError(new DirectoryIOException("Internal error"));
           }
           break;
         case kListDone:
           responsePort.close();
           if (_onDone != null) _onDone(message[kResponseComplete]);
           break;
       }
     });
@@ skipping 21 matching lines @@
     } else {
       throw e;
     }
   }
 
   Function _onDir;
   Function _onFile;
   Function _onDone;
   Function _onError;
 }