Improve UndefinedFunctionError for mis-cased module

lib/elixir/lib/exception.ex

@@ -1342,8 +1342,21 @@ defmodule UndefinedFunctionError do
       hint_for_loaded_module(module, function, arity, nil)
   end
 
-  defp hint(_module, _function, _arity, _loaded?) do
-    ""
+  defp hint(module, function, arity, _loaded?) do
+    {module, _distance} =
+      Enum.map(:code.all_available(), fn {name, _, _} ->
+        {name, String.jaro_distance(to_string(module), to_string(name))}
+      end)
+      |> Enum.sort_by(&elem(&1, 1), :desc)
+      |> Enum.take(3)
+      |> Enum.find(fn {module, _distance} ->
+        module
+        |> to_string()
+        |> String.to_atom()
+        |> function_exported?(function, arity)
+      end)
+
+    ". Did you mean:\n\n      * #{Exception.format_mfa(String.to_existing_atom(to_string(module)), function, arity)}\n"
   end
 
   @doc false

lib/elixir/test/elixir/exception_test.exs

@@ -595,6 +595,14 @@ defmodule ExceptionTest do
       assert message =~ "* set_cookie/2"
     end
 
+    test "annotates undefined function error with module suggestions" do
+      assert blame_message(Enu, & &1.map(&1, 1)) == """
+             function Enu.map/2 is undefined (module Enu is not available). Did you mean:
+
+                   * Enum.map/2
+             """
+    end
+
     test "annotates undefined function clause error with macro hints" do
       assert blame_message(Integer, & &1.is_odd(1)) ==
                "function Integer.is_odd/1 is undefined or private. However, there is " <>