io.c: preserve encodings

* io.c (argf_next_argv): preserve encodings in warning messages.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47306 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 0 deletions

diff --git a/test/ruby/test_argf.rb b/test/ruby/test_argf.rb
index fb869561a1..95d694116f 100644
--- a/test/ruby/test_argf.rb
+++ b/test/ruby/test_argf.rb
@@ -212,6 +212,13 @@ class TestArgf < Test::Unit::TestCase
       assert_equal([], r)
       assert_equal("foo\nbar\nbaz\n", File.read(t.path))
     end
+
+    base = "argf-\u{30c6 30b9 30c8}"
+    name = "#{@tmpdir}/#{base}"
+    File.write(name, "foo")
+    argf = ARGF.class.new(name)
+    argf.inplace_mode = '/\\:'
+    assert_warning(/#{base}/) {argf.gets}
   end
 
   def test_inplace_no_backup