Activate irb if irb is bundled gems

Author: hsbt

prelude.rb

@@ -1,17 +1,19 @@
 class Binding
   # :nodoc:
   def irb
-    force_activate 'irb'
-    require 'irb'
+    begin
+      require 'irb'
+    rescue LoadError, Gem::LoadError
+      force_activate 'irb'
+      retry
+    end
     irb
   end
 
   # suppress redefinition warning
   alias irb irb # :nodoc:
 
   private def force_activate(gem)
-    return if !defined?(Bundler) || Gem.loaded_specs.key?(gem)
-
     Bundler.reset!
 
     builder = Bundler::Dsl.new