Hint Resolve T.sub_refl: ty.

Lemma weight_type_move:
forall e r1 r2 changed e',
type_move e r1 r2 = OK(changed, e') ->
(e'.(te_sub) = e.(te_sub) \/ e'.(te_sub) = (r1, r2) :: e.(te_sub))
/\ (forall r, weight_bounds e'.(te_typ)!r <= weight_bounds e.(te_typ)!r)
/\ (changed = true ->
weight_bounds e'.(te_typ)!r1 + weight_bounds e'.(te_typ)!r2
< weight_bounds e.(te_typ)!r1 + weight_bounds e.(te_typ)!r2).