/usr/lib/mlton/targets/x86_64-linux-gnu/sizes is in mlton-runtime-x86-64-linux-gnu 20100608-5.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | cint = 4
cpointer = 8
cptrdiff = 8
csize = 8
header = 8
mplimb = 8
objptr = 8
seqIndex = 8
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