def tasks_in_scope(scope)
      prefix = scope.join(":")
      tasks.select { |t|
        /^#{prefix}:/ =~ t.name
      }
    end
def tasks_in_scope(scope)
      prefix = scope.join(":")
      tasks.select { |t|
        /^#{prefix}:/ =~ t.name
      }
    end
List of all the tasks defined in the given scope (and its
 sub-scopes).