https://git.ruby-lang.org/ruby.git/commit/?id=59648af296

From 59648af296ab15a2e34ebce62a7cc14deb889e7b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 30 Sep 2019 01:08:32 +0900
Subject: Suppress keyword argument warning from #step

* numeric.c (num_step): pass the extracted argument from keyword
  argument, not the last argument itself which should have been
  warned already.

diff --git a/numeric.c b/numeric.c
index 5bf87bd..c1655c0 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2768,7 +2768,7 @@ num_step(int argc, VALUE *argv, VALUE from) https://github.com/ruby/ruby/blob/trunk/numeric.c#L2768
                                     num_step_size, from, to, step, FALSE);
         }
 
-        RETURN_SIZED_ENUMERATOR(from, argc, argv, num_step_size);
+        return SIZED_ENUMERATOR(from, 2, ((VALUE [2]){to, step}), num_step_size);
     }
 
     desc = num_step_scan_args(argc, argv, &to, &step, TRUE, FALSE);
diff --git a/test/ruby/test_numeric.rb b/test/ruby/test_numeric.rb
index f87abbb..797fd20 100644
--- a/test/ruby/test_numeric.rb
+++ b/test/ruby/test_numeric.rb
@@ -292,6 +292,14 @@ class TestNumeric < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_numeric.rb#L292
     assert_raise(ArgumentError, bug9811) { 1.step(10, 1, by: 11) {} }
     assert_raise(ArgumentError, bug9811) { 1.step(10, 1, by: 11).size }
 
+
+    e = assert_warn(/The last argument is used as the keyword parameter/) {
+      1.step(10, {by: "1"})
+    }
+    assert_warn('') {
+      assert_raise(ArgumentError) {e.size}
+    }
+
     assert_equal(bignum*2+1, (-bignum).step(bignum, 1).size)
     assert_equal(bignum*2, (-bignum).step(bignum-1, 1).size)
 
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