For the standard Doxyfile and the code:

-----
namespace cainteoir { namespace rdf
{
	struct uri {};

	class literal
	{
	public:
		uri type;

		literal();

		template<typename T>
		literal(const T &aValue);

		template<typename T>
		literal(const T &aValue, const std::string &aLanguage);

		template<typename T>
		literal(const T &aValue, const uri &aType);
	};
}}
-----

given either:

    /**
    \fn    cainteoir::rdf::literal::literal(const T &aValue, const cainteoir::rdf::uri &aType)
    \brief Create a datatype literal resource.
    */

or:

    /**
    \fn    cainteoir::rdf::literal::literal(const T &aValue, const uri &aType)
    \brief Create a datatype literal resource.
    */

the following warning is generated:

-----
warning: no matching class member found for 
  cainteoir::rdf::literal::literal(const T &aValue, const cainteoir::rdf::uri &aType)
Possible candidates:
  cainteoir::rdf::literal::literal()
  'template < T >
  cainteoir::rdf::literal::literal(const T &aValue)
  'template < T >
  cainteoir::rdf::literal::literal(const T &aValue, const std::string &aLanguage)
  'template < T >
  cainteoir::rdf::literal::literal(const T &aValue, const uri &aType)
-----

This warning is not present in 1.8.6.

NOTE: Removing the line:

    uri type;

makes the following documentation work:

-----
    /**
    \fn    cainteoir::rdf::literal::literal(const T &aValue, const uri &aType)
    \brief Create a datatype literal resource.
    */
-----