I had thought that `def` returned (the equivalent [because it's really in elixir_bootstrap.erl] of a) quoted block and in order for a `def` to count in a loop, you'd need either a `for` comprehension, or `Enum.map`, so that the `quote` from each `def` is concatenated together to be merged into the caller's quoted form, but [Postgrex.Message.decode_auth_type/1 uses Enum.each](https://github.com/elixir-ecto/postgrex/blame/master/lib/postgrex/messages.ex#L370-L372). How are all the `def`s inside the `Enum.each` being preserved when `Enum.each` doesn't return the value of each function call? This is related to https://github.com/KronicDeth/intellij-elixir/issues/472.
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