######################################################################### A
FileCreationTask is a file task that
when used as a dependency will be needed if and only if the file has not
been created. Once created, it is not re-triggered if any of its
dependencies are newer, nor does trigger any rebuilds of tasks that depend
on it whenever it is updated.
Is this file task needed? Yes
if it doesn‘t exist.
542: def needed?
543: ! File.exist?(name)
544: end
Time stamp for file creation task. This time
stamp is earlier than any other time stamp.
548: def timestamp
549: Rake::EARLY
550: end