/usr/lib/mlton/sml/smlnj-lib/TODO is in mlton-basis 20130715-3.
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 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | Utility library
---------------
  Polymorphic version of dynamic arrays.
  New hash table implementation/API.
HTML Library
------------
  Rewrite parser as recursive descent (the ML-Yacc version doesn't handle
  whitespace in the HEAD element very well).
PP Library
----------
  Add support for tabular layout.
RegExp library
--------------
  Add support for Interval REs to the DFA and Thompson engines
  Add support for "$" to the Thompson engine
  Add support for POSIX character classes to the AWK syntax.  These
  are
	[:alnum:]	Alphanumeric characters. 
	[:alpha:]	Alphabetic characters. 
	[:blank:]	Space and TAB characters. 
	[:cntrl:]	Control characters. 
	[:digit:]	Decimal digits.
	[:graph:]	Characters that are both printable and visible.
			(A space is printable but not visible, whereas an ‘a’ is both.)
	[:lower:]	Lowercase alphabetic characters. 
	[:print:]	Printable characters (characters that are not control characters). 
	[:punct:]	Punctuation characters (characters that are not letters,
			digits, control characters, or space characters). 
	[:space:]	Space characters (such as space, TAB, and formfeed, etc). 
	[:upper:]	Uppercase alphabetic characters. 
	[:xdigit:]	Hexadecimal digits. 
New libraries
-------------
  CGI scripting
 |