In this task, the job is to create a new empty file called "output.txt" of size 0 bytes
and an empty directory called "docs". This should be done twice: once "here", i.e. in the current working directory and once in the filesystem root.

every dir := !["./","/"] do {
   close(open(f := dir || "input.txt","w"))  |stop("failure for open ",f)
   mkdir(f := dir || "docs")                 |stop("failure for mkdir ",f)
   }