Ppx_optcomp.Envval init : tval empty : tval add : t -> var:Base.string Ppxlib.Location.loc -> value:Ppx_optcomp__Interpreter.Value.t -> tval undefine : t -> Base.string Ppxlib.Location.loc -> tval of_list : (Base.string Ppxlib.Location.loc * Ppx_optcomp__Interpreter.Value.t) Base.list -> tval eval : t -> Base.string Ppxlib.Location.loc -> Ppx_optcomp__Interpreter.Value.tval is_defined : ?permissive:Base.bool -> t -> Base.string Ppxlib.Location.loc -> Base.boolval seen : t -> Base.string Ppxlib.Location.loc -> Base.boolval to_expression : t -> Ppxlib.expression