Definition loop1x_ret_assert (Inv : environ -> mpred) (R : ret_assert) :=
  {| RA_normal := Inv; RA_break := FF; RA_continue := Inv; RA_return := R.(RA_return) |}.

Lemma loop1x_ret_assert_EK_normal: forall Inv R, RA_normal (loop1x_ret_assert Inv R) = Inv.