@@cv is not accessible from non-main ractors

Class variables (@@cv) is not accessible from non-main ractors.
But without this patch cached @@cv can be read.

fix [Bug #18128]

1 files changed, 22 insertions, 0 deletions

diff --git a/bootstraptest/test_ractor.rb b/bootstraptest/test_ractor.rb
index 5d9edb26d6..b29db7ab0e 100644
--- a/bootstraptest/test_ractor.rb
+++ b/bootstraptest/test_ractor.rb
@@ -1101,6 +1101,28 @@ assert_equal 'can not access class variables from non-main Ractors', %q{
   end
 }
 
+# also cached cvar in shareable-objects are not allowed to access from non-main Ractor
+assert_equal 'can not access class variables from non-main Ractors', %q{
+  class C
+    @@cv = 'str'
+    def self.cv
+      @@cv
+    end
+  end
+
+  C.cv # cache
+
+  r = Ractor.new do
+    C.cv
+  end
+
+  begin
+    r.take
+  rescue Ractor::RemoteError => e
+    e.cause.message
+  end
+}
+
 # Getting non-shareable objects via constants by other Ractors is not allowed
 assert_equal 'can not access non-shareable objects in constant C::CONST by non-main Ractor.', %q{
   class C