merge revision(s) 57415,57474: [Backport #13239]

	eval.c: copy special exception

	* eval.c (setup_exception): make unfrozen copy of special
	  exception before setting up a cause.
	test_io.rb: separate a test

	* test/ruby/test_io.rb (test_closed_stream_in_rescue): run in a
	  separated process.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59538 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 23 insertions, 0 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index 9a443318b4..4dd515da39 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -3357,5 +3357,28 @@ End
       end
       assert_equal(true, closed, "#{bug13158}: stream should be closed")
     end
+
+    def test_closed_stream_in_rescue
+      assert_separately([], "#{<<-"begin;"}\n#{<<~"end;"}")
+      begin;
+      10.times do
+        assert_nothing_raised(RuntimeError, /frozen IOError/) do
+          IO.pipe do |r, w|
+            th = Thread.start {r.close}
+            r.gets
+          rescue IOError
+            # swallow pending exceptions
+            begin
+              sleep 0.001
+            rescue IOError
+              retry
+            end
+          ensure
+            th.kill.join
+          end
+        end
+      end
+      end;
+    end
   end
 end