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-module(opaque_key_use).
-compile(export_all).
-export_type([t/0, t/1]).
-opaque t() :: #{atom() => integer()}.
-opaque t(A) :: #{A => integer()}.
tt1() ->
A = t0(),
B = t1(),
A =:= B. % never 'true'
-spec t0() -> t().
t0() -> #{a => 1}.
-spec t1() -> t(integer()).
t1() -> #{3 => 1}.
adt_tt1() ->
A = adt_t0(),
B = adt_t1(),
A =:= B. % opaque attempt
adt_tt2() ->
A = adt_t0(),
B = adt_t1(),
#{A => 1 % opaque key
,B => 2 % opaque key
}.
adt_tt3() ->
A = map_adt:t0(),
#{A => 1}. % opaque key
adt_mm1() ->
A = adt_t0(),
M = adt_m0(),
#{A := R} = M, % opaque attempt
R.
%% adt_ms1() ->
%% A = adt_t0(),
%% M = adt_m0(),
%% M#{A}. % opaque arg
adt_mu1() ->
A = adt_t0(),
M = adt_m0(),
M#{A := 4}. % opaque arg
adt_mu2() ->
A = adt_t0(),
M = adt_m0(),
M#{A => 4}. % opaque arg
adt_mu3() ->
M = adt_m0(),
M#{}. % opaque arg
adt_mtm1() ->
A = adt_t0(),
M = adt_mt0(),
#{A := R} = M, % opaque key
R.
%% adt_mts1() ->
%% A = adt_t0(),
%% M = adt_mt0(),
%% M#{A}. % opaque key
adt_mtu1() ->
A = adt_t0(),
M = adt_mt0(),
M#{A := 4}. % opaque key
adt_mtu2() ->
A = adt_t0(),
M = adt_mt0(),
M#{A => 4}. % opaque key
adt_mtu3() ->
M = adt_mt0(),
M#{}. % Ok to not warn
adt_t0() ->
opaque_key_adt:t0().
adt_t1() ->
opaque_key_adt:t1().
adt_m0() ->
opaque_key_adt:m0().
adt_mt0() ->
opaque_key_adt:mt0().
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