Given the following testcase:

/**
 * A string class that should be documented.
 */
class RWCString
{
public:

  /**
   * Index operator.
   */
  char& operator()(size_t i);

  /**
   * @copydoc char& RWCString::operator()(size_t)
   */
  char operator()(size_t i) const

};

doxygen & copydoc do not appear to "see" the second overload.  We have tried several variations of specifying the method signature that we are passing to copydoc, none of which worked.

This does not generate any error message, but it will not generate any documentation for the second overload.