-module(para3).
-export([t/0, t1/1, t2/0, ot1/1, ot2/0, t1_adt/0, t2_adt/0]).
-export([exp_adt/0]).
%% More opaque tests.
-export_type([ot1/0, ot1/1, ot1/2, ot1/3, ot1/4, ot1/5]).
-opaque ot1() :: {ot1(_)}.
-opaque ot1(A) :: {ot1(A, A)}.
-opaque ot1(A, B) :: {ot1(A, B, A)}.
-opaque ot1(A, B, C) :: {ot1(A, B, C, A)}.
-opaque ot1(A, B, C, D) :: {ot1(A, B, C, D, A)}.
-opaque ot1(A, B, C, D, E) :: {A, B, C, D, E}.
-spec ot1(_) -> ot1().
ot1(A) ->
{{{{{A, A, A, A, A}}}}}.
-spec ot2() -> ot1(). % invalid type spec
ot2() ->
foo.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
t() ->
{{{17}}} = t1(3). %% pattern can never match
-type t1() :: {t1(_)}.
-type t1(A) :: {t1(A, A)}.
-type t1(A, B) :: {t1(A, B, A)}.
-type t1(A, B, C) :: {t1(A, B, C, A)}.
-type t1(A, B, C, D) :: {t1(A, B, C, D, A)}.
-type t1(A, B, C, D, E) :: {A, B, C, D, E}.
-spec t1(_) -> t1().
t1(A) ->
{{{{{A, A, A, A, A}}}}}.
-spec t2() -> t1(). % invalid type spec
t2() ->
foo.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Shows that the list TypeNames in t_from_form must include ArgsLen.
t1_adt() ->
{{{{{17}}}}} = para3_adt:t1(3). % breaks the opacity
t2_adt() ->
{{{{17}}}} = para3_adt:t1(3). % can never match
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-type exp() :: para3_adt:exp1(para3_adt:exp2()).
-spec exp_adt() -> exp(). % invalid type spec
exp_adt() ->
3.
