root:
             version = v1
             creates   file:./
             creates   file:plan.py
             creates   step:./plan.py

file:plan.py
                path = plan.py
               state = STATIC
          created by   root:
            consumes   file:./
            supplies   step:./plan.py

file:./
                path = ./
               state = STATIC
          created by   root:
            supplies   (file:nonexisting/)
            supplies   file:plan.py
            supplies   step:./demo.py
            supplies   step:./plan.py

step:./plan.py
             workdir = ./
             command = ./plan.py
               state = SUCCEEDED
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   step:./demo.py

step:./demo.py
             workdir = ./
             command = ./demo.py
               state = PENDING
  consumes (amended) = file:nonexisting/
  supplies (amended) = file:nonexisting/foo.out
          created by   step:./plan.py
            consumes   file:./
            consumes   (file:nonexisting/)
             creates   file:nonexisting/foo.out
            supplies   file:nonexisting/foo.out

(file:nonexisting/)
                path = nonexisting/
               state = PENDING
            consumes   file:./
            supplies   file:nonexisting/foo.out
            supplies   step:./demo.py

file:nonexisting/foo.out
                path = nonexisting/foo.out
               state = PENDING
          created by   step:./demo.py
            consumes   (file:nonexisting/)
            consumes   step:./demo.py
