Revert "Fix errors with ref/4 IEx helper (#8016)"

This reverts commit b9d6f4f.

Author: José Valim

lib/iex/lib/iex/helpers.ex

@@ -1204,34 +1204,25 @@ defmodule IEx.Helpers do
 
   ## Examples
 
-      iex> ref("0.1.2.3")
-      #Reference<0.1.2.3>
+      iex> ref("0.21.32.43")
+      #Reference<0.21.32.43>
 
   """
   @doc since: "1.6.0"
   def ref(string) when is_binary(string) do
     :erlang.list_to_ref('#Ref<#{string}>')
   end
 
-  @doc """
-  Creates a Reference from its 4 non-negative integers components.
-
-  ## Examples
-
-      iex> ref(0, 1, 2, 3)
-      #Reference<0.1.2.3>
-
-  """
   @doc since: "1.6.0"
   def ref(w, x, y, z)
       when is_integer(w) and w >= 0 and is_integer(x) and x >= 0 and is_integer(y) and y >= 0 and
              is_integer(z) and z >= 0 do
     :erlang.list_to_ref(
-      '#Ref<' ++
+      '<' ++
         Integer.to_charlist(w) ++
         '.' ++
         Integer.to_charlist(x) ++
-        '.' ++ Integer.to_charlist(y) ++ '.' ++ Integer.to_charlist(z) ++ '>'
+        '.' ++ '.' ++ Integer.to_charlist(y) ++ '.' ++ '.' ++ Integer.to_charlist(z) ++ '.' ++ '>'
     )
   end
 

lib/iex/test/iex/helpers_test.exs

@@ -1090,26 +1090,6 @@ defmodule IEx.HelpersTest do
     end
   end
 
-  describe "ref" do
-    test "builds a ref from string" do
-      assert inspect(ref("0.419006.1377304581.1")) == "#Reference<0.419006.1377304581.1>"
-      assert inspect(ref("0.1.2.3")) == "#Reference<0.1.2.3>"
-
-      assert_raise ArgumentError, fn ->
-        ref("0.6.6.-6")
-      end
-    end
-
-    test "builds a ref from integers" do
-      assert inspect(ref(0, 419_006, 1_377_304_581, 1)) == "#Reference<0.419006.1377304581.1>"
-      assert inspect(ref(0, 1, 2, 3)) == "#Reference<0.1.2.3>"
-
-      assert_raise FunctionClauseError, fn ->
-        ref(0, 6, 6, -6)
-      end
-    end
-  end
-
   describe "i" do
     test "prints information about the data type" do
       assert capture_io(fn -> i(:ok) end) =~ """