https://git.ruby-lang.org/ruby.git/commit/?id=89c8ca32d0

From 89c8ca32d0a8542c9360f45734c799d81c4738ad Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Fri, 30 Oct 2020 16:48:42 +0900
Subject: add a test of define_method with shareable Proc.

a method defined by define_method with normal Proc can not cross
ractors because the normal Proc is not shareable. However,
shareable Proc can be crossed between ractors, so the method with
shareable Proc should be called correctly.

diff --git a/bootstraptest/test_ractor.rb b/bootstraptest/test_ractor.rb
index a61e741..65ea334 100644
--- a/bootstraptest/test_ractor.rb
+++ b/bootstraptest/test_ractor.rb
@@ -933,6 +933,17 @@ assert_equal 'true', %q{ https://github.com/ruby/ruby/blob/trunk/bootstraptest/test_ractor.rb#L933
   Ractor.shareable?(pr)
 }
 
+# define_method() can invoke different Ractor's proc if the proc is shareable.
+assert_equal '1', %q{
+  class C
+    a = 1
+    define_method "foo", Ractor.make_shareable(Proc.new{ a })
+    a = 2
+  end
+
+  Ractor.new{ C.new.foo }.take
+}
+
 # Ractor.make_shareable(a_proc) makes a proc shareable.
 assert_equal 'can not make a Proc shareable because it accesses outer variables (a).', %q{
   a = b = nil
-- 
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