marshal.c: don't call the proc with partially initialized objects. (#4866)

For cyclic objects, it requires to keep a st_table of the partially
initialized objects.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/ruby/test_marshal.rb b/test/ruby/test_marshal.rb
index f7f273af42..131ebd5fa6 100644
--- a/test/ruby/test_marshal.rb
+++ b/test/ruby/test_marshal.rb
@@ -858,4 +858,16 @@ class TestMarshal < Test::Unit::TestCase
       assert_nil(e2.backtrace_locations) # temporal
     end
   end
+
+  class TestMarshalFreezeProc < Test::Unit::TestCase
+    include MarshalTestLib
+
+    def encode(o)
+      Marshal.dump(o)
+    end
+
+    def decode(s)
+      Marshal.load(s, :freeze.to_proc)
+    end
+  end
 end