Proofview.Progressval goal_equal :
evd:Evd.evar_map ->
extended_evd:Evd.evar_map ->
Evar.t ->
Evar.t ->
boolgoal_equal ~evd ~extended_evd evar extended_evar tests whether the evar_info from evd corresponding to evar is equal to that from extended_evd corresponding to extended_evar, up to existential variable instantiation and equalisable universes. The universe constraints in extended_evd are assumed to be an extension of the universe constraints in evd.