/usr/lib/mlton/sml/mlrisc-lib/IR/ is in mlton-basis 20130715-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/mlton/sml/mlrisc-lib/IR/README
/usr/lib/mlton/sml/mlrisc-lib/IR/dataflow.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/dataflow.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-branch-chaining.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg-gen.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg-gen.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg-gen2.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg-structuring.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg-structuring.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg-util.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg-util.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cfg2cluster.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-cluster2cfg.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-format-insn.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-idefs.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-idefs.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-ir-optimization.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-ir.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-ir.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-liveness.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-preheaders.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-preheaders.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-reshape-branches.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/mlrisc-reshape-branches.sml
/usr/lib/mlton/sml/mlrisc-lib/IR/sources.cm
/usr/lib/mlton/sml/mlrisc-lib/IR/static-branch-prediction.sig
/usr/lib/mlton/sml/mlrisc-lib/IR/static-branch-prediction.sml