vm.c: avoid inadvertent pin-down

* vm.c (vm_stat): get rid of inadvertent dynamic symbol pin-down,
  and preserve encoding in error messages.  also should not use
  RSTRING_PTR macro on function calls.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45482 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 2 deletions

diff --git a/vm.c b/vm.c
index 5b4aa6fae0..1742cc5008 100644
--- a/vm.c
+++ b/vm.c
@@ -173,8 +173,9 @@ vm_stat(int argc, VALUE *argv, VALUE self)
     SET(class_serial, ruby_vm_class_serial);
 #undef SET
 
-    if (key != Qnil) /* matched key should return above */
-	rb_raise(rb_eArgError, "unknown key: %s", RSTRING_PTR(rb_id2str(SYM2ID(key))));
+    if (!NIL_P(key)) { /* matched key should return above */
+	rb_raise(rb_eArgError, "unknown key: %"PRIsVALUE, rb_sym2str(key));
+    }
 
     return hash;
 }