# `Dialyxir.Warnings.CallbackNotExported`
[🔗](https://github.com/jeremyjh/dialyxir/blob/1.4.8/lib/dialyxir/warnings/callback_not_exported.ex#L1)

Module implements a behaviour, but does not export some of its
callbacks.

## Example
    defmodule Example do
      @behaviour GenServer

      def init(_) do
        :ok
      end

      # OK. No warning.
      def handle_all(_request, _from, state) do
        {:noreply, state}
      end

      # Not exported. Should be a warning.
      @spec handle_cast(any(), any()) :: binary()
      defp handle_cast(_request, _state) do
        "abc"
      end

      # Not exported and conflicting arguments and return value. No warning
      # since format_status/1 is an optional callback.
      @spec format_status(binary()) :: binary()
      def format_status(bin) when is_binary(bin) do
        bin
      end
    end

---

*Consult [api-reference.md](api-reference.md) for complete listing*