module Opn: sig .. end
sig
end
val mk : ?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> ?docs:Docstrings.docs -> ?override:Asttypes.override_flag -> Ast_helper.lid -> Parsetree.open_description
?loc:Ast_helper.loc -> ?attrs:Ast_helper.attrs -> ?docs:Docstrings.docs -> ?override:Asttypes.override_flag -> Ast_helper.lid -> Parsetree.open_description