Elixir Result type test

result.ex

defmodule Result do
  @type t :: {:ok, any} | {:failure, any}

  @spec map(Result.t, any :: any) :: Result.t
  def map(result, mapping) do
    case result do
      {:ok, value} -> {:ok, mapping.(value)}
      {:this_is_wrong, err} -> {:this_is_wrong, err}
    end
  end

  @spec map(Result.t, any :: Result.t) :: Result.t
  def bind(result, mapping) do
    case result do
      {:ok, value} -> mapping.(value)
      {:this_is_wrong, err} -> {:this_is_wrong, err}
    end
  end
end

How do I get the elixir compiler (or maybe a linter) to tell me this code is not pattern matching correctly.