Problem
-------

    def call(service, atoms \\ [:retry_error], rescue_only \\ [], fun) do
      retry with: delay_stream(service),
                  rescue_only: rescue_only,
                  atoms: atoms do
        # ... fun.()
      after
        result ->
          result
      else
        error ->
          error
      end
    end

This code does not comply as when Elixir tries to expand the macro the
expanded code refers to "atoms" variable which can not be used in a
"in" expression used in a guard.

    ** (ArgumentError) invalid right argument for operator "in", it expects a compile-time proper list or compile-time range on the right side when used in guard expressions, got: atoms

Solution
--------

Remove "in" expression from the guards to allow the `atoms` to be a
variable.