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| Predicate delete_directory/2 |
if_nonempty(Value), which controls the behavior
when OldName is not empty. Value may be ignore (silently
succeed without deleting anything), fail (silently fail
without deleting anything), error (throw an error - default
behavior), and delete (recursively delete the directory and
its contents, as if by delete_directory_and_contents/1 from
library(filesex)).