* test/dl/test_callback.rb (test_callback_with_string): prevents

  temporary string from GC.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33127 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 2 deletions

diff --git a/test/dl/test_callback.rb b/test/dl/test_callback.rb
index ed3be661e7..fb24ff0ca5 100644
--- a/test/dl/test_callback.rb
+++ b/test/dl/test_callback.rb
@@ -48,8 +48,11 @@ module DL
       func = CFunc.new(addr, TYPE_VOID, 'test')
       f = Function.new(func, [TYPE_VOIDP])
 
-      f.call(dlwrap('foo'))
-      assert_equal 'foo', called_with
+      # Don't remove local variable arg.
+      # This necessary to protect objects from GC.
+      arg = 'foo'
+      f.call(dlwrap(arg))
+      assert_equal arg, called_with
     end
 
     def test_call_callback