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-rw-r--r--railties/lib/initializer.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/railties/lib/initializer.rb b/railties/lib/initializer.rb
index b5bf9266f5..e36f917b15 100644
--- a/railties/lib/initializer.rb
+++ b/railties/lib/initializer.rb
@@ -160,6 +160,10 @@ module Rails
# ActiveResource. This allows Gem plugins to depend on Rails even when
# the Gem version of Rails shouldn't be loaded.
def install_gem_spec_stubs
+ unless Rails.respond_to?(:vendor_rails?)
+ abort "Your config/boot.rb is outdated: Run 'rake rails:update'."
+ end
+
if Rails.vendor_rails?
begin; require "rubygems"; rescue LoadError; return; end