Definition CSharpMin_halted (q : CSharpMin_core): option val :=
    match q with
       CSharpMin_Returnstate v Kstop => Some v
     | _ => None
    end.

Lemma CSharpMin_corestep_not_halted : forall ge m q m' q', CSharpMin_corestep ge q m q' m' -> CSharpMin_halted q = None.