rspec in persistent-dmnd-1.0.3

- old
+ new
@@ -6,15 +6,23 @@
 #
 # The application 'rspec' is installed as part of a gem, and
 # this file is here to facilitate running it.
 #
 
-bundle_binstub = File.expand_path("../bundle", __FILE__)
-load(bundle_binstub) if File.file?(bundle_binstub)
-
 require "pathname"
-ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
+ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../gems.rb",
   Pathname.new(__FILE__).realpath)
+
+bundle_binstub = File.expand_path("../bundle", __FILE__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300) =~ /This file was generated by Bundler/
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
 
 require "rubygems"
 require "bundler/setup"
 
 load Gem.bin_path("rspec-core", "rspec")