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 eq_relflag_dec : forall t1 t2 : relflag, {t1 = t2} +  {~ t1 = t2}.