/usr/lib/mlton/sml/mlrisc-lib/visualization/ is in mlton-basis 20130715-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/mlton/sml/mlrisc-lib/visualization/allDisplays.sml
/usr/lib/mlton/sml/mlrisc-lib/visualization/cfgViewer.sml
/usr/lib/mlton/sml/mlrisc-lib/visualization/daVinci.sml
/usr/lib/mlton/sml/mlrisc-lib/visualization/dot.sml
/usr/lib/mlton/sml/mlrisc-lib/visualization/graphDisplay.sig
/usr/lib/mlton/sml/mlrisc-lib/visualization/graphLayout.sml
/usr/lib/mlton/sml/mlrisc-lib/visualization/graphViewer.sig
/usr/lib/mlton/sml/mlrisc-lib/visualization/graphViewer.sml
/usr/lib/mlton/sml/mlrisc-lib/visualization/mlrisc-format-insn.sml
/usr/lib/mlton/sml/mlrisc-lib/visualization/sources.cm
/usr/lib/mlton/sml/mlrisc-lib/visualization/vcg.sml