Evar_tacticsval instantiate_tac : 
  int ->
  Ltac_pretype.closed_glob_constr ->
  (Names.Id.t * Locus.hyp_location_flag) option ->
  unit Proofview.tacticval instantiate_tac_by_name : 
  Names.Id.t ->
  Ltac_pretype.closed_glob_constr ->
  unit Proofview.tacticval let_evar : Names.Name.t -> EConstr.types -> unit Proofview.tactic