Definition semax vars (G: funspecs) (P: assert) (k: control) : Prop :=
typecheck vars k = true /\ forall n,  semax' (SemaxArg vars (fun s => P s && funassert G) k) n.
Definition semax_func (G: funspecs) (p: program) (G': funspecs) :=
match_specs p G' /\
forall n, believe_all semax' G p G' n.

Lemma semax_go:  forall vars G (P: funspec) x ys,
typecheck vars (Go x ys) = true ->
semax vars G (fun s => cont P (eval x s) && call P (eval_list ys s)) (Go x ys) .