Rakefiles are executables, and rake loads rake, not rakefile code

Rakefile

@@ -1,7 +1,7 @@
+#!/usr/bin/env rake
 gem 'rdoc', '>= 2.5.10'
 require 'rdoc'
 
-require 'rake'
 require 'rdoc/task'
 require 'net/http'
 

actionmailer/Rakefile

@@ -1,4 +1,4 @@
-require 'rake'
+#!/usr/bin/env rake
 require 'rake/testtask'
 require 'rake/packagetask'
 require 'rake/gempackagetask'

actionpack/Rakefile

@@ -1,4 +1,4 @@
-require 'rake'
+#!/usr/bin/env rake
 require 'rake/testtask'
 require 'rake/packagetask'
 require 'rake/gempackagetask'

activerecord/Rakefile

@@ -1,4 +1,4 @@
-require 'rake'
+#!/usr/bin/env rake
 require 'rake/testtask'
 require 'rake/packagetask'
 require 'rake/gempackagetask'

activeresource/Rakefile

@@ -1,4 +1,4 @@
-require 'rake'
+#!/usr/bin/env rake
 require 'rake/testtask'
 require 'rake/packagetask'
 require 'rake/gempackagetask'

railties/Rakefile

@@ -1,4 +1,4 @@
-require 'rake'
+#!/usr/bin/env rake
 require 'rake/testtask'
 require 'rake/gempackagetask'
 

railties/lib/rails/generators/rails/app/templates/Rakefile

@@ -1,7 +1,7 @@
+#!/usr/bin/env rake
 # Add your own tasks in files placed in lib/tasks ending in .rake,
 # for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
 
 require File.expand_path('../config/application', __FILE__)
-require 'rake'
 
 <%= app_const %>.load_tasks

railties/lib/rails/generators/rails/plugin/templates/Rakefile.tt

@@ -1,4 +1,4 @@
-require 'rake'
+#!/usr/bin/env rake
 require 'rake/testtask'
 require 'rake/rdoctask'
 

railties/lib/rails/generators/rails/plugin_new/templates/Rakefile

@@ -1,12 +1,10 @@
-# encoding: UTF-8
-require 'rubygems'
+#!/usr/bin/env rake
 begin
   require 'bundler/setup'
 rescue LoadError
   puts 'You must `gem install bundler` and `bundle install` to run rake tasks'
 end
 
-require 'rake'
 require 'rake/rdoctask'
 
 Rake::RDocTask.new(:rdoc) do |rdoc|