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            Construct a basic_file
            on an existing native file handle.
          
basic_file(
    const executor_type & ex,
    const native_handle_type & native_file);
This constructor initialises a file object to hold an existing native file.
The I/O executor that the file will use, by default, to dispatch handlers for any asynchronous operations performed on the file.
A native file handle.
Thrown on failure.