gistfile1.ex

defmodule Test do
  defstruct foo: nil, bar: nil
  for x <- @keys do # <-------------------------- HOW  ????
    def parse(unquote(x)), do: something(x)
    def parse(unquote(Atom.to_string(x))), do: something(x)
  end
end

defmodule Test do
   @keys foo: nil, bar: nil
   defstruct @keys
   for {x, _} <- @keys do
     def parse(unquote(x)), do: something(unquote(x))
     def parse(unquote(Atom.to_string(x))), do: something(unquote(x))
   end
end

defmodule Test do
    defstruct foo: nil, bar: nil
    for k <- @struct |> Map.keys |> List.delete(:__struct__) do
       def parse(unquote(x)), do: something(unquote(x))
       def parse(unquote(Atom.to_string(x))), do: something(unquote(x))
   end
end