root:
             product   file:plan.py
             product   step:./plan.py

file:plan.py
               state = CONFIRMED
             creator   root:
                sink   step:./plan.py

step:./plan.py
               state = SUCCEEDED
                need = PLAN
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   root:
              source   file:plan.py
             product   file:work.py
             product   step:./work.py fast fast.txt
             product   step:./work.py medium medium.txt
             product   step:./work.py slow slow.txt

file:work.py
               state = CONFIRMED
             creator   step:./plan.py
                sink   step:./work.py fast fast.txt
                sink   step:./work.py medium medium.txt
                sink   step:./work.py slow slow.txt

step:./work.py fast fast.txt
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:work.py
             product   file:fast.txt
                sink   file:fast.txt

file:fast.txt
               state = BUILT
             creator   step:./work.py fast fast.txt
              source   step:./work.py fast fast.txt

step:./work.py medium medium.txt
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:work.py
             product   file:medium.txt
                sink   file:medium.txt

file:medium.txt
               state = BUILT
             creator   step:./work.py medium medium.txt
              source   step:./work.py medium medium.txt

step:./work.py slow slow.txt
               state = SUCCEEDED
                need = DEFAULT
           using_env = STEPUP_PATH_FILTER [dynamic]
             creator   step:./plan.py
              source   file:work.py
             product   file:slow.txt
                sink   file:slow.txt

file:slow.txt
               state = BUILT
             creator   step:./work.py slow slow.txt
              source   step:./work.py slow slow.txt
