hash.c: set encoding

* hash.c (env_assoc): the encoding of the value should be the
  locale, as well as other methods, [], fetch, values, etc.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55811 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Thu Aug  4 11:54:30 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* hash.c (env_assoc): the encoding of the value should be the
+	  locale, as well as other methods, [], fetch, values, etc.
+
 Wed Aug  3 21:31:23 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (reg_fragment_enc_error): compile_error is different

hash.c

@@ -3899,7 +3899,7 @@ env_assoc(VALUE env, VALUE key)
 
     s = env_name(key);
     e = getenv(s);
-    if (e) return rb_assoc_new(key, rb_tainted_str_new2(e));
+    if (e) return rb_assoc_new(key, env_str_new2(e));
     return Qnil;
 }
 

test/ruby/test_env.rb

@@ -319,6 +319,8 @@ class TestEnv < Test::Unit::TestCase
       assert_equal("foo", v)
     end
     assert_invalid_env {|var| ENV.assoc(var)}
+    assert_predicate(v, :tainted?)
+    assert_equal(Encoding.find("locale"), v.encoding)
   end
 
   def test_has_value2