* bootstraptest/test_knownbug.rb: add new test. [ruby-dev:31698]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13332 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/test_knownbug.rb

@@ -3,3 +3,13 @@
 # So all tests will cause failure.
 #
 
+assert_equal 1, %q{
+  catch do |t|
+    begin
+      throw t, 1
+      2
+    ensure
+      3
+    end
+  end
+}, "[ruby-dev:31698]"