# File lib/rake.rb, line 1724 1724: def [](task_name, scopes=nil) 1725: task_name = task_name.to_s 1726: self.lookup(task_name, scopes) or 1727: enhance_with_matching_rule(task_name) or 1728: synthesize_file_task(task_name) or 1729: fail "Don't know how to build task '#{task_name}'" 1730: end