eval.c: preserve errinfo

* eval.c (setup_exception): preserve errinfo across calling #to_s
  method on the exception.  [ruby-core:61091] [Bug #9568]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45180 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 22 insertions, 0 deletions

diff --git a/test/ruby/test_exception.rb b/test/ruby/test_exception.rb
index fc1c209e99..ffcee80ca3 100644
--- a/test/ruby/test_exception.rb
+++ b/test/ruby/test_exception.rb
@@ -78,6 +78,28 @@ class TestException < Test::Unit::TestCase
     assert(!bad)
   end
 
+  def test_errinfo_in_debug
+    bug9568 = EnvUtil.labeled_class("[ruby-core:61091] [Bug #9568]", RuntimeError) do
+      def to_s
+        require '\0'
+      rescue LoadError
+        self.class.to_s
+      end
+    end
+
+    err = EnvUtil.verbose_warning do
+      assert_raise(bug9568) do
+        $DEBUG, debug = true, $DEBUG
+        begin
+          raise bug9568
+        ensure
+          $DEBUG = debug
+        end
+      end
+    end
+    assert_include(err, bug9568.to_s)
+  end
+
   def test_break_ensure
     bad = true
     while true