-WDocumentation warning on multiple defs in a single comment block

I have a chunk of code that looks like this:

    \struct hex_decode_error
    \brief Base exception class for all hex decoding errors
    \struct non_hex_input
    \brief Thrown when a non-hex value (0-9, A-F) encountered when decoding.
          Contains the offending character
    \struct not_enough_input
    \brief Thrown when the input sequence unexpectedly ends
  struct hex_decode_error : virtual boost::exception, virtual std::exception {};
  struct not_enough_input : virtual hex_decode_error {};
  struct non_hex_input : virtual hex_decode_error {};

Doxygen processes it correctly.
TOT clang (using -Wdocumentation) warns about duplicate \brief comments.

Specifically, it says:
  warning: duplicated command "\brief" [-Wdocumentation]

Obviously, I can break this up into three comment blocks, but why should I have to?

-- Marshall

Marshall Clow Idio Software <mailto:mclow.lists@gmail.com>

A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait).
        -- Yu Suzuki

Currently we don't process \struct and similar commands. The reason
is that handling these commands is a much more complicated problem
than what we do now; I don't even think we can do it cheaply. When we
process the comment, we need to first find the corresponding
declaration. Currently we attach the comment to the next declaration

To handle the situation you describe we would essentially need to
postpone parsing comments until the end of TU. Maybe one day we will
do this (when we will parse declaration references in comments --
essentially the same problem), but we don't do it now.