* transcode.c (str_transcode0): don't scrub invalid chars if

  str.encode doesn't have explicit invalid: :replace.
  workaround fix for see #8995

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43802 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 0 deletions

diff --git a/test/ruby/test_transcode.rb b/test/ruby/test_transcode.rb
index db91010c94..25c9d24663 100644
--- a/test/ruby/test_transcode.rb
+++ b/test/ruby/test_transcode.rb
@@ -2071,4 +2071,13 @@ class TestTranscode < Test::Unit::TestCase
       assert_equal(4, 'aaa'.encode(enc).length, "should count in #{enc} with BOM")
     end
   end
+
+  def test_encode_with_invalid_chars
+    bug8995 = '[ruby-dev:47747]'
+    EnvUtil.with_default_internal(Encoding::UTF_8) do
+      str = "\xff".force_encoding('utf-8')
+      assert_equal str, str.encode, bug8995
+      assert_equal "\ufffd", str.encode(invalid: :replace), bug8995
+    end
+  end
 end