Facial Recognition Payments with Elixir Elixir Wizards S3E4: Justin Schneck and Frank Hunleth on Nerves and Performance

Dialyzer specs: 2 in 1

Implementation of defs is_forty_two(n: integer) :: boolean do … end syntax to generate both @spec and the respective def clauses in 20 lines.

https://rocket-science.ru/hacking/2019/12/17/dialyzer-specs-2-in-1