x3 bug? It cannot synthesize attribute of type boost::iterator_range in a sequence parser

In a simple parser test  http://coliru.stacked-crooked.com/a/5b3bde9736c9fc43
<http://coliru.stacked-crooked.com/a/5b3bde9736c9fc43>  

    std::string str("x123x");
    boost::iterator_range<boost::range_iterator&lt;decltype(str)>::type>
attr;
    if( x3::parse( boost::begin(str), boost::end(str), *x3::lit('x') >>
x3::raw[+x3::digit] >> x3::lit('x')*, attr ) ) {
        std::cout<<"Match! attr = "<<attr&lt;&lt;std::endl;
    } else {
        std::cout&lt;&lt;&quot;Not match!&quot;&lt;&lt;std::endl;
    }

The highlighted code is supposed to synthesize an attribute of type
boost::iterator_range&lt;Iterator>. But it cannot compile. If we remove
either of the two x3::lit('x'), it compiles.




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