intuition.
simpl.
unfold sumList.
simpl.
destruct (EqDec_dec eqd b b).
rewrite <- ratAdd_0_l.
rewrite ratMult_1_l.
intuition.
congruence.
Qed.

Theorem evalDist_assoc_eq : forall (A : Set)(c1 : Comp A)(B C : Set)(c2 : A -> Comp B)(c3 : B -> Comp C),
dist_sem_eq (Bind (Bind c1 c2) c3) (Bind c1 (fun a => (Bind (c2 a) c3))).