add a test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14773 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/strscan/test_stringscanner.rb

@@ -541,4 +541,11 @@ class TestStringScanner < Test::Unit::TestCase
     ss = StringScanner.new("\xA1\xA2".force_encoding("euc-jp"))
     assert_equal(Encoding::EUC_JP, ss.scan(/./e).encoding)
   end
+
+  def test_generic_regexp
+    ss = StringScanner.new("\xA1\xA2".force_encoding("euc-jp"))
+    t = ss.scan(/./)
+    assert_equal("\xa1\xa1".force_encoding("euc-jp"), t)
+  end
+
 end