https://git.ruby-lang.org/ruby.git/commit/?id=6bb473ea37

From 6bb473ea3778908aaa8da51bc8be63b86652e69a Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 5 Aug 2019 14:05:59 +0000
Subject: merge revision(s) 5e018214e7435030727a97ac49db038d96438e74: [Backport
 #15720]

	Fix SystemStackError when calling a method in an unused refinement

	Fixes [Bug #15720]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67729 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/test/ruby/test_refinement.rb b/test/ruby/test_refinement.rb
index 06150d9..38d0adb 100644
--- a/test/ruby/test_refinement.rb
+++ b/test/ruby/test_refinement.rb
@@ -2204,6 +2204,38 @@ class TestRefinement < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_refinement.rb#L2204
     INPUT
   end
 
+  def test_call_method_in_unused_refinement
+    bug15720 = '[ruby-core:91916] [Bug #15720]'
+    assert_in_out_err([], <<-INPUT, ["ok"], [], bug15720)
+      module M1
+        refine Kernel do
+          def foo
+            'foo called!'
+          end
+        end
+      end
+
+      module M2
+        refine Kernel do
+          def bar
+            'bar called!'
+          end
+        end
+      end
+
+      using M1
+
+      foo
+
+      begin
+        bar
+      rescue NameError
+      end
+
+      puts "ok"
+    INPUT
+  end
+
   def test_super_from_refined_module
     a = EnvUtil.labeled_module("A") do
       def foo;"[A#{super}]";end
diff --git a/version.h b/version.h
index 4015567..462aa01 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.6.3"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 79
+#define RUBY_PATCHLEVEL 80
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 8
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index 4f39a0f..4a47a8e 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -2315,7 +2315,10 @@ vm_call_method_each_type(rb_execution_context_t *ec, rb_control_frame_t *cfp, st https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.c#L2315
 		    goto no_refinement_dispatch;
 		}
 	    }
-	    cc->me = ref_me;
+            if (cc->me->def->type != VM_METHOD_TYPE_REFINED ||
+                 cc->me->def != ref_me->def) {
+                 cc->me = ref_me;
+            }
 	    if (ref_me->def->type != VM_METHOD_TYPE_REFINED) {
 		return vm_call_method(ec, cfp, calling, ci, cc);
 	    }
-- 
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