anchor.diff:          inRootDir = true;
         }
         ''
  -        dumpdir="$1"
  +        dumpdir="''${1:?dumpdir not set}"
           tmpdir="$(mktemp -d)"
           mkdir -p "$dumpdir"
           ${cabal-install}/bin/cabal v2-build ${devCabalOptions} \
  
positive.code:         name = "postgrest-hsie-graph-symbols";
          docs = "Create a PNG graph of symbols imported within the codebase.";
        }
        ''${hsieMinimalImports} graph-symbols | ${graphviz}/bin/dot -Tpng -o "$1"'';
  in
  buildEnv {
    name = "postgrest-devtools";
  
negative.code:         name = "postgrest-hsie-graph-modules";
          docs = "Create a PNG graph of modules imported within the codebase.";
        }
        ''
          outfile="''${1:?outfile not set}"
          ${hsie} graph-modules main src | ${graphviz}/bin/dot -Tpng -o "$outfile"
        '';
  
    hsieGraphSymbols =
      checkedShellScript
  