From 6f484e4930be69c58462dd11c97663e6c8488b8e Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 3 Sep 2002 05:20:14 +0000
Subject: 	* variable.c (rb_copy_generic_ivar): remove old generic
 instance 	  variable table if it existes.

	* class.c (rb_make_metaclass): metaclass of a metaclass is a
	  metaclass itself.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2784 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 io.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'io.c')

diff --git a/io.c b/io.c
index 7de74befde..28cb8a51c7 100644
--- a/io.c
+++ b/io.c
@@ -177,6 +177,7 @@ rb_io_taint_check(io)
 {
     if (!OBJ_TAINTED(io) && rb_safe_level() >= 4)
 	rb_raise(rb_eSecurityError, "Insecure: operation on untainted IO");
+    rb_check_frozen(io);
     return io;
 }
 
@@ -2270,6 +2271,7 @@ rb_io_become(clone, io)
     char *mode;
 
     io = rb_io_get_io(io);
+    if (clone == io) return clone;
     GetOpenFile(io, orig);
     MakeOpenFile(clone, fptr);
 
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