Drain cherries and pineapple; save ... boiling; add to jello in a large pretty bowl ... is dissolved. Heat coke and add 1 cup cold ... and chill until firm.
Drain pineapple. Bring pineapple juice ... a boil. Add jello and stir until dissolved. Stir in pie filling and Diet Coke. Chill until slightly thickened ... firm. Yields 8 servings.