Why is this code returning the wrong type?

[Gary Willoughby]

Why won't the following code compile? Here's the error:
filewatcher.d(21): Error: cannot implicitly convert expression 
(new File(file, "r")) of type File* to shared(_iobuf)*

/**
 * Imports.
 */
import std.stdio;

/**
 * A class to watch for changes in a file.
 */
class Example
{
        /**
         * Member variables.
         */
        private FILE* _file;

        /**
         * Constructor.
         */
        public this(string file)
        {
                this._file = new File(file, "r");
        }
}