Section SIMPLE_EVAL.
Variable f: function.
Variable k: cont.
Variable e: env.
Variable m: mem.
Fixpoint rval_list (vl: list val) (rl: exprlist) : exprlist :=
match vl, rl with
| v1 :: vl', Econs r1 rl' => Econs (Eval v1 (typeof r1)) (rval_list vl' rl')
| _, _ => Enil
end.
Inductive eval_simple_list': exprlist -> list val -> Prop :=
| esrl'_nil:
eval_simple_list' Enil nil
| esrl'_cons: forall r rl v vl,
eval_simple_rvalue e m r v ->
eval_simple_list' rl vl ->
eval_simple_list' (Econs r rl) (v :: vl).
Fixpoint exprlist_app (rl1 rl2: exprlist) : exprlist :=
match rl1 with
| Enil => rl2
| Econs r1 rl1' => Econs r1 (exprlist_app rl1' rl2)
end.

Lemma exprlist_app_assoc:
forall rl2 rl3 rl1,
exprlist_app (exprlist_app rl1 rl2) rl3 =
exprlist_app rl1 (exprlist_app rl2 rl3).