module Opn:sig
..end
val mk : ?loc:Location.t ->
?attrs:Ast_406.Parsetree.attributes ->
?docs:Ast_406.Docstrings.docs ->
?override:Ast_406.Asttypes.override_flag ->
Longident.t Ast_406.Asttypes.loc -> Ast_406.Parsetree.open_description