Doxygen Comments and Xcode Code Completion

I've got some C++ code with Doxygen documentation comments (the /**-style kind), and I'd love it if those showed up in Xcode's code completion. They do show up in Quick Help. And the triple-slash style documentation comments do show up in code completion. Anyone know how to make this work?

Filed as Feedback FB7824467 with a sample project and screenshots.