Make Registry.send work when value part is present (#11742)

Fix #11740.

lib/elixir/lib/registry.ex

@@ -260,6 +260,10 @@ defmodule Registry do
     end
   end
 
+  def send({registry, key, _value}, msg) do
+    Registry.send({registry, key}, msg)
+  end
+
   @doc false
   def unregister_name({registry, key}), do: unregister(registry, key)
   def unregister_name({registry, key, _value}), do: unregister(registry, key)

lib/elixir/test/elixir/registry_test.exs

@@ -896,6 +896,20 @@ defmodule RegistryTest do
     assert {%RuntimeError{message: "some error"}, _stacktrace} = error
   end
 
+  test "send works", %{registry: registry} do
+    name = {registry, "self"}
+    Registry.register_name(name, self())
+    GenServer.cast({:via, Registry, name}, :message)
+    assert_received {:"$gen_cast", :message}
+  end
+
+  test "send works with value", %{registry: registry} do
+    name = {registry, "self", "value"}
+    Registry.register_name(name, self())
+    GenServer.cast({:via, Registry, name}, :message)
+    assert_received {:"$gen_cast", :message}
+  end
+
   defp register_task(registry, key, value) do
     parent = self()