usa	2017-05-12 20:49:05 +0900 (Fri, 12 May 2017)

  New Revision: 58687

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=58687

  Log:
    Encoding.default_internal should affect ENV on Windows like other platforms
    
    * hash.c (env_str_transcode): call rb_external_str_with_enc() if
      default_internal is available.

  Modified files:
    trunk/hash.c
Index: hash.c
===================================================================
--- hash.c	(revision 58686)
+++ hash.c	(revision 58687)
@@ -3070,8 +3070,15 @@ extern char **environ; https://github.com/ruby/ruby/blob/trunk/hash.c#L3070
 static VALUE
 env_str_transcode(VALUE str, rb_encoding *enc)
 {
-    return rb_str_conv_enc_opts(str, NULL, enc,
-				ECONV_INVALID_REPLACE | ECONV_UNDEF_REPLACE, Qnil);
+    rb_encoding *internal = rb_default_internal_encoding();
+    if (!internal) {
+	return rb_str_conv_enc_opts(str, NULL, enc,
+				    ECONV_INVALID_REPLACE | ECONV_UNDEF_REPLACE,
+				    Qnil);
+    }
+    else {
+	return rb_external_str_with_enc(str, rb_utf8_encoding());
+    }
 }
 #endif
 

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