Fix type definition

Author: soutaro

core/enumerator.rbs

@@ -639,10 +639,4 @@ class Enumerator::Chain[out Elem] < Enumerator[Elem, void]
   #
   def each: () { (Elem) -> void } -> self
           | () -> Enumerator[Elem, self]
-
-  # wrong argument type chain (expected enumerator) (TypeError)
-  def with_index: (?Integer) ?{ (?) -> untyped } -> bot
-
-  # wrong argument type chain (expected enumerator) (TypeError)
-  def each_with_index: () ?{ (?) -> untyped } -> bot
 end

test/stdlib/Enumerator_test.rb

@@ -95,15 +95,13 @@ class EnumeratorChainTest < Test::Unit::TestCase
   testing "::Enumerator::Chain[::Integer]"
 
   def test_class_new
-    assert_send_type "(*_Each[Integer] enums) -> Enumerator::Chain[Integer]",
+    assert_send_type "(Range[Integer], Array[Integer]) -> Enumerator::Chain[Integer]",
                      Enumerator::Chain, :new, 1..3, [4, 5]
   end
 
   def test_each
     enum = Enumerator::Chain.new 1..3, [4, 5]
     assert_send_type "() { (Integer) -> nil } -> Enumerator::Chain[Integer]",
                      enum, :each do end
-    assert_send_type "() -> Enumerator[Integer, Enumerator::Chain[Integer]]",
-                     enum, :each
   end
 end