comments describing callbacks dropped from generated documentation

[xorcus]

With the following jsdoc comment, it is expected that a type definition appears on the page where MyClass is documented, and to be able to reference the callback type when documenting method arguments like this:
@param {MyClass~myCallbackType} callback The callback invoked when ...

/**

• Description of my callback function type
• @callback MyClass~myCallbackType
• @param {string} arg1 The first argument
• @param {object} arg2 The second argument
  */

using "@typedef {function} MyClass~myCallbackType" does not work either