Fix block return type

core/enumerator.rbs

@@ -293,7 +293,7 @@ class Enumerator[unchecked out Elem, out Return] < Object
   # lazy fashion (see Enumerator#size). It can either be a value or a callable
   # object.
   #
-  def initialize: (?Integer arg0) { (Enumerator::Yielder arg0) -> void } -> void
+  def initialize: (?Integer arg0) { (Enumerator::Yielder arg0) -> Return } -> void
 
   # <!--
   #   rdoc-file=enumerator.c

test/stdlib/Enumerator_test.rb

@@ -18,13 +18,24 @@ def test_with_object
     assert_send_type "(String) -> Enumerator[[Integer, String], String]", g, :with_object, ''
     assert_send_type "(String) { (Integer, String) -> untyped } -> String", g, :with_object, '' do end
   end
+
+  def test_each
+    enum = Enumerator.new { [1,2,3] }
+    assert_send_type "() { (Integer) -> nil } -> [1,2,3]",
+                     enum, :each do end
+  end
 end
 
 class EnumeratorSingletonTest < Test::Unit::TestCase
   include TestHelper
 
   testing "singleton(::Enumerator)"
 
+  def test_new
+    assert_send_type "() { (Enumerator::Yielder) -> 12345 } -> void",
+                     Enumerator, :new do 12345 end
+  end
+
   def test_produce
     assert_send_type(
       "(Integer initial) { (Integer) -> Integer } -> Enumerator[Integer, bot]",