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-module(my_callbacks_correct).
-behaviour(my_behaviour).
-export([foo/0]).
-type pair(A,B) :: {A,B}.
-type nested() :: pair(pair(pair(f,f),f),f).
%% This is correctly implemented, but a combination of Dialyzer
%% "simplification" logic and subtyping rules for behaviours means
%% this implementation has historically been erroneously rejected
-spec foo() -> #{ nested() => x }.
foo() ->
Ret = #{ {{{f,f}, f}, f} => x },
Ret.
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