date_core.c: keep COMPLEX_DAT bit

* ext/date/date_core.c (d_lite_initialize_copy): do not change
  COMPLEX_DAT bit, as the structure does not change.  initialize
  member-wise instead.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65697 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 8 insertions, 0 deletions

diff --git a/test/date/test_date_new.rb b/test/date/test_date_new.rb
index fe9a631ad0..6ea9c69041 100644
--- a/test/date/test_date_new.rb
+++ b/test/date/test_date_new.rb
@@ -267,4 +267,12 @@ class TestDateNew < Test::Unit::TestCase
     assert_in_delta(t, t2, t - z + 2)
   end
 
+  def test_memsize
+    require 'objspace'
+    t = DateTime.now
+    size = ObjectSpace.memsize_of(t)
+    t.__send__(:initialize_copy, Date.today)
+    assert_instance_of(DateTime, t)
+    assert_equal(size, ObjectSpace.memsize_of(t), "not reallocated but memsize changed")
+  end
 end