code: function runMethodEffect(inst, property, props, oldProps, info) {
    // Instances can optionally have a _methodHost which allows redirecting where
    // to find methods. Currently used by `templatize`.
    let context = inst._methodHost || inst;
    let fn = context[info.methodName];
    if (fn) {
      let args = marshalArgs(inst.__data, info.args, property, props);
      return fn.apply(context, args);
    } else if (!info.dynamicFn) {
      console.warn('method `' + info.methodName + '` not defined');
    }
  }
docs: Calls a method with arguments marshaled from properties on the instance
  based on the method signature contained in the effect metadata.
  
  Multi-property observers, computed properties, and inline computing
  functions call this function to invoke the method, then use the return
  value accordingly.
  
  @param {!PropertyEffectsType} inst The instance the effect will be run on
  @param {string} property Name of property
  @param {Object} props Bag of current property changes
  @param {Object} oldProps Bag of previous values for changed properties
  @param {?} info Effect metadata
  @return {*} Returns the return value from the method invocation
  @private