https://git.ruby-lang.org/ruby.git/commit/?id=70f2780892

From 70f2780892330f8d1b612002c437fc2ca739fc7f Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Thu, 5 Sep 2019 18:57:19 +0900
Subject: vm_call_bmethod should not drop the empty keyword hash

Similar to 38e9c1bc35d5549575fbb263afff560e97db068e

diff --git a/test/ruby/test_keyword.rb b/test/ruby/test_keyword.rb
index 3c486a4..dc450c0 100644
--- a/test/ruby/test_keyword.rb
+++ b/test/ruby/test_keyword.rb
@@ -733,7 +733,9 @@ class TestKeywordArguments < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_keyword.rb#L733
       define_method(:m) {|arg, **opt| [arg, opt] }
     end
     assert_raise(ArgumentError) { c.m(**{}) }
-    assert_raise(ArgumentError) { c.m(**kw) }
+    assert_warn(/The keyword argument is passed as the last hash parameter/m) do
+      assert_equal([kw, kw], c.m(**kw))
+    end
     assert_warn(/The keyword argument is passed as the last hash parameter/m) do
       assert_equal([h, kw], c.m(**h))
     end
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 70fbb49..227ec2e 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -2279,7 +2279,7 @@ vm_call_bmethod(rb_execution_context_t *ec, rb_control_frame_t *cfp, struct rb_c https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L2279
     VALUE *argv;
     int argc;
 
-    CALLER_SETUP_ARG(cfp, calling, ci, 1);
+    CALLER_SETUP_ARG(cfp, calling, ci, 0);
     argc = calling->argc;
     argv = ALLOCA_N(VALUE, argc);
     MEMCPY(argv, cfp->sp - argc, VALUE, argc);
-- 
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