Unnecessary Function Arguments

[elbrujohalcon]

Rule

A rule to detect unnecessary function arguments.
The rule emits a warning for each function argument that is consistently ignored in all function clauses.

Example

defmodule Hanky do
  def a_func(_ignored, not_ignored, _not_ignored) do
    not_ignored
  end
  def a_func(_ignored, _not_ignored, not_ignored) do
    not_ignored
  end
end

Meandro should warn us about the first parameter of a_func/2.