https://git.ruby-lang.org/ruby.git/commit/?id=11d9983bc3

From 11d9983bc340f3cc05da3a87d5d0c63f4f6bd899 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 21 Oct 2020 14:11:18 +0900
Subject: Make the value shareable deeply


diff --git a/test/ruby/test_parse.rb b/test/ruby/test_parse.rb
index f12b610..a9ab4c4 100644
--- a/test/ruby/test_parse.rb
+++ b/test/ruby/test_parse.rb
@@ -1181,20 +1181,24 @@ x = __ENCODING__ https://github.com/ruby/ruby/blob/trunk/test/ruby/test_parse.rb#L1181
     a = Class.new.class_eval("#{<<~"begin;"}\n#{<<~'end;'}")
     begin;
       # shareable_constant_value: true
-      A = []
+      A = [[1]]
     end;
     assert_predicate(a, :frozen?)
+    assert_equal([1], a[0])
+    assert_predicate(a[0], :frozen?)
     a, b = Class.new.class_eval("#{<<~"begin;"}\n#{<<~'end;'}")
     begin;
       # shareable_constant_value: false
       class X # shareable_constant_value: true
-        A = []
+        A = [[1]]
       end
       B = []
       [X::A, B]
     end;
     assert_predicate(a, :frozen?)
     assert_not_predicate(b, :frozen?)
+    assert_equal([1], a[0])
+    assert_predicate(a[0], :frozen?)
   end
 
 =begin
diff --git a/vm.c b/vm.c
index 8ced733..bc57caf 100644
--- a/vm.c
+++ b/vm.c
@@ -3179,7 +3179,7 @@ m_core_hash_merge_kwd(VALUE recv, VALUE hash, VALUE kw) https://github.com/ruby/ruby/blob/trunk/vm.c#L3179
 static VALUE
 m_core_make_shareable(VALUE recv, VALUE obj)
 {
-    return rb_obj_freeze(obj);
+    return rb_ractor_make_shareable(obj);
 }
 
 static VALUE
-- 
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