* object.c (rb_mod_attr): make Module#attr to be an alias to

attr_reader.  [RCR#331]

* ruby.h: export classes/modules to implement sandbox.
  [ruby-core:08283]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@10577 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/tracer.rb

@@ -19,9 +19,9 @@ class Tracer
   @stdout = STDOUT
   @verbose = false
   class << self
-    attr :verbose, true
+    attr_accessor :verbose
     alias verbose? verbose
-    attr :stdout, true
+    attr_accessor :stdout
   end
   
   EVENT_SYMBOL = {