Elixir 1.3.0 does not warn unused aliases, if the module contains an import

[talklittle]

Environment

• Elixir version (elixir -v): 1.3.0
• Operating system: OS X 10.10.5

Current behavior

If a module has an unused alias, and also an import of any module, then the "unused alias" warning is not shown.

Example, add this to $ELIXIR_REPO/lib/elixir/test/elixir/kernel/warning_test.exs:

  test "unused alias when also import" do
    assert capture_err(fn ->
      Code.compile_string """
      defmodule Sample do
        alias :lists, as: List
        import HashSet
        def a, do: new()  # HashSet.new/0
      end
      """
    end) =~ "unused alias List"
  after
    purge Sample
  end

Expected behavior

The "unused alias" warning should still be shown. The presence of an unrelated import should not affect it.

[josevalim]

@talklittle good catch!

[lexmag]

@talklittle 💛