Do not warn on defaults from defoverridable, closes #15061

Author: josevalim

lib/elixir/lib/module/types.ex

@@ -178,7 +178,7 @@ defmodule Module.Types do
     default = Keyword.get(meta, :defaults, 0)
 
     cond do
-      Keyword.get(meta, :context) != nil ->
+      Keyword.get(meta, :context) != nil or Keyword.get(meta, :from_super) == true ->
         :ok
 
       default == 0 ->

lib/elixir/test/elixir/kernel/overridable_test.exs

@@ -159,6 +159,18 @@ defmodule Kernel.Overridable do
   def private_macro_call(val \\ 11) do
     private_macro(val)
   end
+
+  ## Defaults
+
+  def with_default(a, b \\ 1) do
+    a + b
+  end
+
+  defoverridable with_default: 2
+
+  def with_default(a, b) do
+    super(a + b, a + b)
+  end
 end
 
 defmodule Kernel.OverridableExampleBehaviour do
@@ -171,7 +183,7 @@ end
 
 defmodule Kernel.OverridableTest do
   require Kernel.Overridable, as: Overridable
-  use ExUnit.Case
+  use ExUnit.Case, async: true
 
   defp purge(module) do
     :code.purge(module)
@@ -286,6 +298,11 @@ defmodule Kernel.OverridableTest do
     assert Overridable.multiple_overrides() == [3, 2, 1]
   end
 
+  test "with defaults" do
+    assert Overridable.with_default(5) == 12
+    assert Overridable.with_default(5, 2) == 14
+  end
+
   test "overridable macros" do
     a = 11
     assert Overridable.overridable_macro(a) == 1111