Module fc_dec_aux (wf : fc_wf_sig) (weak : fc_weak_sig) (subst : fc_subst_sig) (unique: fc_unique_sig).
(**** Decision procedures for a few auxiliary relations ****)

Lemma binds_dec_co : forall x G, {AB, K | binds x (Co (Eq (fst AB) (snd AB) K)) G} + {(forall A B K, ¬ binds x (Co (Eq A B K)) G)}.