rakefile_location

# File lib/rake/application.rb, line 715
    def rakefile_location(backtrace=caller)
      backtrace.map { |t| t[/([^:]+):/, 1] }

      re = /^#{@rakefile}$/
      re = /#{re.source}/ if windows?

      backtrace.find { |str| str =~ re } || ''
    end