root:
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file:./
               state = STATIC
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file:plan.py
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step:runpy ./plan.py
               state = SUCCEEDED
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             creates   file:sub/part2.tex
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file:sub/
               state = STATIC
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            supplies   file:sub/article.tex
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file:sub/article_structured.tex
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file:sub/part1.tex
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          created by   step:runpy ./plan.py
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            supplies   step:flatten-latex sub/article_structured.tex sub/article.tex

file:sub/part2.tex
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            consumes   file:sub/
            supplies   step:flatten-latex sub/article_structured.tex sub/article.tex

step:flatten-latex sub/article_structured.tex sub/article.tex
               state = SUCCEEDED
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            consumes   file:./
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file:sub/article.tex
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            consumes   step:flatten-latex sub/article_structured.tex sub/article.tex
