https://git.ruby-lang.org/ruby.git/commit/?id=abe12d8b96

From abe12d8b96be3c12618811f22ca01788366f99f8 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 29 Aug 2019 16:58:21 +0900
Subject: Freeze method reference operator object

[Feature #16103]

diff --git a/insns.def b/insns.def
index 0233014..3b82d4e 100644
--- a/insns.def
+++ b/insns.def
@@ -707,6 +707,7 @@ methodref https://github.com/ruby/ruby/blob/trunk/insns.def#L707
 (VALUE ret)
 {
     ret = rb_obj_method(val, ID2SYM(id));
+    RB_OBJ_FREEZE_RAW(ret);
 }
 
 /**********************************************************/
diff --git a/test/ruby/test_method.rb b/test/ruby/test_method.rb
index ba425a4..acaf43e 100644
--- a/test/ruby/test_method.rb
+++ b/test/ruby/test_method.rb
@@ -1120,16 +1120,20 @@ class TestMethod < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_method.rb#L1120
 
   def test_method_reference_operator
     m = 1.:succ
+    assert_predicate(m, :frozen?)
     assert_equal(1.method(:succ), m)
     assert_equal(2, m.())
     m = 1.:+
+    assert_predicate(m, :frozen?)
     assert_equal(1.method(:+), m)
     assert_equal(42, m.(41))
     m = 1.:-@
+    assert_predicate(m, :frozen?)
     assert_equal(1.method(:-@), m)
     assert_equal(-1, m.())
     o = Object.new
     def o.foo; 42; end
+    assert_predicate(o.:foo, :frozen?)
     m = o.method(:foo)
     assert_equal(m, o.:foo)
     def o.method(m); nil; end
-- 
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