| Index: lib/io/file_impl.dart
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| diff --git a/lib/io/file_impl.dart b/lib/io/file_impl.dart
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| index 95cfc66d5a7e77b9521c3424ea8f23d2bd874b5a..05126a8bbf09f38f7a94fb3a0db3d2f737605cf5 100644
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| --- a/lib/io/file_impl.dart
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| +++ b/lib/io/file_impl.dart
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| @@ -198,7 +198,7 @@ class _FileOutputStream extends _BaseOutputStream implements OutputStream {
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|      // A copy is required by the interface.
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|      var length = buffer.length - offset;
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|      if (len != null) {
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| -      if (len > length) throw new IndexOutOfRangeException(len);
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| +      if (len > length) throw new RangeError.value(len);
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|        length = len;
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|      }
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|      var copy = new Uint8List(length);
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| @@ -772,10 +772,10 @@ class _RandomAccessFile extends _FileBase implements RandomAccessFile {
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|    }
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|  
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|    static void _checkReadWriteListArguments(int length, int offset, int bytes) {
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| -    if (offset < 0) throw new IndexOutOfRangeException(offset);
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| -    if (bytes < 0) throw new IndexOutOfRangeException(bytes);
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| +    if (offset < 0) throw new RangeError.value(offset);
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| +    if (bytes < 0) throw new RangeError.value(bytes);
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|      if ((offset + bytes) > length) {
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| -      throw new IndexOutOfRangeException(offset + bytes);
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| +      throw new RangeError.value(offset + bytes);
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|      }
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|    }
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|  
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| 
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