root:
             creates   file:./
             creates   file:plan.py
             creates   step:runpy ./plan.py

file:./
               state = STATIC
          created by   root:
            supplies   file:copy.txt
            supplies   file:plan.py
            supplies   file:static/
            supplies   step:copy static/sub/foo.txt copy.txt
            supplies   step:runpy ./plan.py

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

step:runpy ./plan.py
               state = SUCCEEDED
             env_var = STEPUP_PATH_FILTER [amended]
          created by   root:
            consumes   file:./
            consumes   file:plan.py
             creates   dg:static/**
             creates   step:copy static/sub/foo.txt copy.txt

dg:static/**
          created by   step:runpy ./plan.py
             creates   file:static/
             creates   file:static/sub/
             creates   file:static/sub/foo.txt

step:copy static/sub/foo.txt copy.txt
               state = SUCCEEDED
          created by   step:runpy ./plan.py
            consumes   file:./
            consumes   file:static/sub/
            consumes   file:static/sub/foo.txt
             creates   file:copy.txt
            supplies   file:copy.txt

file:static/sub/
               state = STATIC
          created by   dg:static/**
            consumes   file:static/
            supplies   file:static/sub/foo.txt
            supplies   step:copy static/sub/foo.txt copy.txt

file:static/
               state = STATIC
          created by   dg:static/**
            consumes   file:./
            supplies   file:static/sub/

file:static/sub/foo.txt
               state = STATIC
          created by   dg:static/**
            consumes   file:static/sub/
            supplies   step:copy static/sub/foo.txt copy.txt

file:copy.txt
               state = BUILT
          created by   step:copy static/sub/foo.txt copy.txt
            consumes   file:./
            consumes   step:copy static/sub/foo.txt copy.txt
