Can a Warlock/Fighter use action surge to cast another spell?

@RatatoskurinnCan a Warlock/Fighter MC use action surge to cast another spell? could he cast, casting time bonus action+cantrip+1action spell? no, using your bonus action to cast shuts down using an action for a non-cantrip, regardless of total number of actions

— Mike Mearls (@mikemearls) March 17, 2016