1 files changed, 32 insertions, 16 deletions
diff --git a/prelude.rb b/prelude.rb
index a38a578595..b6c610dd58 100644
--- a/prelude.rb
+++ b/prelude.rb
@@ -1,25 +1,41 @@
+class Binding
+  # :nodoc:
+  def irb(...)
+    suppress = Thread.current[:__bundled_gems_warning_suppression]
+    Thread.current[:__bundled_gems_warning_suppression] = ['reline', 'rdoc']
 
-# Mutex
-
-class Mutex
-  def synchronize
-    self.lock
     begin
-      yield
-    ensure
-      self.unlock rescue nil
+      require 'irb'
+    rescue LoadError, Gem::LoadError
+      Gem::BUNDLED_GEMS.force_activate 'irb'
+      require 'irb'
     end
+    irb(...)
+  ensure
+    Thread.current[:__bundled_gems_warning_suppression] = suppress
   end
-end
 
-# Thread
+  # suppress redefinition warning
+  alias irb irb # :nodoc:
+end
 
-class Thread
-  MUTEX_FOR_THREAD_EXCLUSIVE = Mutex.new
-  def self.exclusive
-    MUTEX_FOR_THREAD_EXCLUSIVE.synchronize{
-      yield
-    }
+module Kernel
+  # :stopdoc:
+  def pp(*objs)
+    require 'pp'
+    pp(*objs)
   end
+
+  # suppress redefinition warning
+  alias pp pp
+
+  private :pp
+  # :startdoc:
 end
 
+module Enumerable
+  # Makes a set from the enumerable object with given arguments.
+  def to_set(&block)
+    Set.new(self, &block)
+  end
+end