Change_table undefined with sqlite3 adapter

Hi,

After checking out latest rails edge (Submodule path 'vendor/rails': checked out '7f4171da5e3ed5b3e038b95f8f5ae05ba6e21bef'), I can't make change_table work.

Migration file is:

class ChangePages < ActiveRecord::Migration
  def self.up
    change_table :pages do |t|
      t.references :topic
    end
    add_index :pages, :topic_id
  end

  def self.down
    change_table :pages do |t|
      t.remove_column :topic_id 
    end
  end
end

$ rake db:migrate
(...)
-- change_table(:pages)
rake aborted!
undefined method `change_table' for #<ActiveRecord::ConnectionAdapters::SQLite3Adapter:0x2131e40>