intuition.
exists (x <-$ c1; ret (x, x)).
intuition.
unfold marginal_l.
dist_inline_first.
rewrite <- evalDist_right_ident.
dist_skip.
dist_compute.
unfold marginal_r.
dist_inline_first.
rewrite <- H.
rewrite <- evalDist_right_ident.
dist_skip.
dist_compute.
repeat simp_in_support.
trivial.
Grab Existential Variables.
intuition.
intuition.
Qed.

Theorem comp_spec_eq_refl :
forall (A : Set){eqd : EqDec A}(c : Comp A),
comp_spec eq c c.