run (Rake::Application)

          # File lib/rake.rb, line 1897
    1897:     def run
    1898:       handle_options
    1899:       begin
    1900:         tasks = collect_tasks
    1901:         load_rakefile
    1902:         if options.show_tasks
    1903:           display_tasks_and_comments
    1904:         elsif options.show_prereqs
    1905:           display_prerequisites
    1906:         else
    1907:           tasks.each { |task_name| Rake::Task[task_name].invoke }
    1908:         end
    1909:       rescue Exception => ex
    1910:         puts "rake aborted!"
    1911:         puts ex.message
    1912:         if options.trace
    1913:           puts ex.backtrace.join("\n")
    1914:         else
    1915:           puts ex.backtrace.find {|str| str =~ /#{@rakefile}/ } || ""
    1916:           puts "(See full trace by running task with --trace)"
    1917:         end
    1918:         exit(1)
    1919:       end
    1920:     end