string.c: respect the actual encoding

* string.c (rb_enc_str_coderange): respect the actual encoding of
  if a BOM presents, and scan for the actual code range.
  [ruby-core:91662] [Bug #15635]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67167 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_m17n.rb b/test/ruby/test_m17n.rb
index c1184c551f..75daf61376 100644
--- a/test/ruby/test_m17n.rb
+++ b/test/ruby/test_m17n.rb
@@ -269,6 +269,13 @@ class TestM17N < Test::Unit::TestCase
     assert_empty(encs, bug10598)
   end
 
+  def test_utf_without_bom_valid
+    encs = [Encoding::UTF_16, Encoding::UTF_32].find_all {|enc|
+      !(+"abcd").encode!(enc).force_encoding(enc).valid_encoding?
+    }
+    assert_empty(encs)
+  end
+
   def test_object_utf16_32_inspect
     EnvUtil.suppress_warning do
       begin