WebStorm 11 'Unresolved method or function'

I just upgraded to WS 11, and see JS warnings that were not present in WS 6. In particular the warning "Unresolved method or function".

The following example shows the warning - and illustrates how I declare classes.

How should I document this to remove the error?

Also, is there a way to see what type WebStorm thinks a variable is and the members of that type?

/**
* @class
* @memberOf package
*/
var Clazz = (function() {
  function Clazz() {
  }

  Clazz.prototype.func = function() {
    ...
  };

  /** @param {Clazz} inst */
  var localFunc = function( inst ) {
    inst.func();   // WARNING HERE
  };

  return Clazz;
}());