Warn missing irb cases

1 files changed, 5 insertions, 1 deletions

diff --git a/prelude.rb b/prelude.rb
index 48d94641bd..02d93efdd9 100644
--- a/prelude.rb
+++ b/prelude.rb
@@ -1,7 +1,11 @@
 class Binding
   # :nodoc:
   def irb
-    force_activate "irb" if defined?(Bundler) && !Gem.loaded_specs["irb"]
+    if defined?(Bundler) && !Gem.loaded_specs["irb"]
+      unless force_activate "irb"
+        warn "irb is not found. Install irb from RubyGems or add irb to Gemfile."
+      end
+    end
     require 'irb'
     irb
   end