+ Equality.equality ->
+ (Subst.substitution * Equality.equality * bool) option
+val unification_all :
+ Cic.metasenv * Cic.context * CicUniv.universe_graph ->
+ Index.t ->
+ Equality.equality ->
+ (Subst.substitution * Equality.equality * bool) list
+val subsumption_all :
+ Cic.metasenv * Cic.context * CicUniv.universe_graph ->
+ Index.t ->
+ Equality.equality ->
+ (Subst.substitution * Equality.equality * bool) list