Definition retval : environ -> val := eval_id ret_temp.
Hint Rewrite eval_id_same : norm.
Hint Rewrite eval_id_other using solve [clear; intro Hx; inversion Hx] : norm.

Lemma simpl_get_result1:
forall (f: val -> Prop) i, @liftx (Tarrow environ (LiftEnviron Prop)) (@liftx (Tarrow val (LiftEnviron Prop))f retval) (get_result1 i) = `f (eval_id i).