r##"# [ no_mangle ] pub extern "C" fn Boo_f2 ( this : * mut Boo , ) -> CRustOption4232mut3232c_void {
 let this : & mut Boo = unsafe { this . as_mut ( ) . unwrap ( ) } ;
 let mut ret : Option < Box < Box < Foo > > > = Boo :: f2 ( this , ) ;
 let mut ret : CRustOption4232mut3232c_void = match ret { Some ( mut x ) => {
   let data : * mut :: std :: os :: raw :: c_void = < Box < Box < Foo > >>:: box_object ( x ) ;
     CRustOption4232mut3232c_void { val : CRustOptionUnion4232mut3232c_void { data } , is_some : 1 , } }
   None => CRustOption4232mut3232c_void { val : CRustOptionUnion4232mut3232c_void { uninit : 0 } , is_some : 0 , } , } ;
 ret }"##;