# File lib/rake.rb, line 1468 1468: def [](task_name, scopes=nil) 1469: task_name = task_name.to_s 1470: self.lookup(task_name, scopes) or 1471: enhance_with_matching_rule(task_name) or 1472: synthesize_file_task(task_name) or 1473: fail "Don't know how to build task '#{task_name}'" 1474: end