add a test for [ruby-dev:32054].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13698 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

bootstraptest/test_knownbug.rb

@@ -42,3 +42,18 @@ assert_normal_exit %q{
   }
 }, '[ruby-dev:31985]'
 
+assert_normal_exit %q{
+class C
+  def initialize(str)
+    @str = str
+  end
+  def _dump(limit)
+    @str
+  end
+  def C._load(s)
+    C.new(s)
+  end
+end
+Marshal.load("\004\bu:\006C\003\377\377\377a")
+}, '[ruby-dev:32054]'
+