https://git.ruby-lang.org/ruby.git/commit/?id=a7dccd08e7

From a7dccd08e7c9cf0e5d0c0fdbe659ccc921624e6f Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@m...>
Date: Sat, 26 Sep 2020 15:49:43 -0400
Subject: [ruby/matrix] Make frozen matrices Ractor shareable


diff --git a/lib/matrix.rb b/lib/matrix.rb
index c6193eb..32f1e23 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -532,7 +532,8 @@ class Matrix https://github.com/ruby/ruby/blob/trunk/lib/matrix.rb#L532
   alias map! collect!
 
   def freeze
-    @rows.freeze
+    @rows.each(&:freeze).freeze
+
     super
   end
 
@@ -2141,6 +2142,9 @@ class Vector https://github.com/ruby/ruby/blob/trunk/lib/matrix.rb#L2142
     all?(&:zero?)
   end
 
+  #
+  # Makes the matrix frozen and Ractor-shareable
+  #
   def freeze
     @elements.freeze
     super
diff --git a/test/matrix/test_matrix.rb b/test/matrix/test_matrix.rb
index 8125fb2..03e6bf1 100644
--- a/test/matrix/test_matrix.rb
+++ b/test/matrix/test_matrix.rb
@@ -818,4 +818,13 @@ class TestMatrix < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/matrix/test_matrix.rb#L818
     assert_equal(Matrix[[(1-2i), 1], [(0-1i), 2], [0, 3]], @c1.adjoint)
     assert_equal(Matrix.empty(0,2), @e1.adjoint)
   end
+
+  def test_ractor
+    obj1 = @m1.freeze
+
+    obj2 = Ractor.new obj1 do |obj|
+      obj
+    end.take
+    assert_same obj1, obj2
+  end if defined?(Ractor)
 end
-- 
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