io.c: preserve encodings

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

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47303 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 3 deletions

diff --git a/io.c b/io.c
index 7dc1c8956c..ddd9f1a9ff 100644
--- a/io.c
+++ b/io.c
@@ -8558,9 +8558,7 @@ advice_arg_check(VALUE advice)
 	advice != sym_willneed &&
 	advice != sym_dontneed &&
 	advice != sym_noreuse) {
-	VALUE symname = rb_inspect(advice);
-	rb_raise(rb_eNotImpError, "Unsupported advice: %s",
-		 StringValuePtr(symname));
+	rb_raise(rb_eNotImpError, "Unsupported advice: %+"PRIsVALUE, advice);
     }
 }