# File lib/rake.rb, line 1532
1532:     def lookup(task_name, initial_scope=nil)
1533:       initial_scope ||= @scope
1534:       task_name = task_name.to_s
1535:       if task_name =~ /^rake:/
1536:         scopes = []
1537:         task_name = task_name.sub(/^rake:/, '')
1538:       elsif task_name =~ /^(\^+)/
1539:         scopes = initial_scope[0, initial_scope.size - $1.size]
1540:         task_name = task_name.sub(/^(\^+)/, '')
1541:       else
1542:         scopes = initial_scope
1543:       end
1544:       lookup_in_scope(task_name, scopes)
1545:     end