shugo

module X
  refine Fixnum do
    def foo; p :foo; end
  end
end

module Y
  refine Fixnum do
    def bar; p :bar; end
  end

shugo

$ ruby -v test/openssl/test_ssl.rb
ruby 2.0.0dev (2012-11-01 trunk 37417) [i686-linux]
Run options: 

# Running tests:

...............test/openssl/test_ssl.rb:24: warning: SSL session is not started yet.
............/home/shugo/local/lib/ruby/2.0.0/openssl/buffering.rb:53: warning: SSL session is not started yet.
..E...

shugo

class C
  def foo
    "original"
  end
end

module M
  refine C do
    def foo
      "refined"

shugo

diff --git a/compile.c b/compile.c
index 16bfcef..eb824ca 100644
--- a/compile.c
+++ b/compile.c
@@ -954,6 +954,7 @@ new_callinfo(rb_iseq_t *iseq, ID mid, int argc, VALUE block, unsigned long flag)
 	}
     }
     ci->vmstat = 0;
+    ci->refinements = Qundef;
     ci->blockptr = 0;

shugo

$ ./ruby test/test_timeout.rb         
Run options: 

# Running tests:

[6/6] TestTimeout#test_timeout_immediate2 = 0.50 s                       
  1) Failure:
test_timeout_immediate2(TestTimeout) [test/test_timeout.rb:65]:
[RuntimeError] exception expected, not
Class: <#<Class:0x21da1fbc>>

shugo

$ ~/src/mspec/bin/mspec -t ruby
ruby 2.0.0dev (2013-01-11 trunk 38771) [i686-linux]
.......................................................................................................................................................................................................................................E....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

shugo

socklen_t
rsock_unix_sockaddr_len(VALUE path)
{
#ifdef __linux__
    if (RSTRING_PTR(path)[0] == '\0') {
        /* abstract namespace; see unix(7) for details. */
        return (socklen_t) offsetof(struct sockaddr_un, sun_path) +
            RSTRING_LEN(path);
    }
    else {

shugo

= $SAFE=4を使わないでください

$SAFE=4は一部の方にサンドボックスとして利用されていますが、ブラックリスト方式であるため潜在的な脆弱性が存在します。
このため、doc/security.rdocにも記述されているとおり、サンドボックスとしての利用は推奨されていません。

また、Ruby 2.1では$SAFE=4の機能は削除され、$SAFEに4以上の値を代入すると例外が発生するようになります。
今後は、$SAFE=4を使用しないようにお願いします。

= Don't use $SAFE=4

shugo

diff --git a/compile.c b/compile.c
index 2285d28..ace1296 100644
--- a/compile.c
+++ b/compile.c
@@ -547,6 +547,10 @@ rb_iseq_compile_node(VALUE self, NODE *node)
 	ADD_INSN1(ret, 0, throw, INT2FIX(0) /* continue throw */ );
     }
     else {
+	if (iseq->type == ISEQ_TYPE_CLASS) {
+	    ADD_INSN(ret, iseq->compile_data->last_line, pop);

shugo

/tmp/ruby-build.20140125230823.3913 ~
HTTP/1.1 200 OK
Content-Type: binary/octet-stream
Content-Length: 15076389
Connection: keep-alive
Date: Sun, 12 Jan 2014 22:08:31 GMT
Last-Modified: Wed, 25 Dec 2013 16:03:08 GMT
ETag: "9e6386d53f5200a3e7069107405b93f7"
Accept-Ranges: bytes
Server: AmazonS3