[MLton] _pos aka __FILE__ __LINE__ etc

[Wesley W. Terpstra]

Would anyone else like a _pos language extension that evaluates to the
current file, line, and column? For use in something like: assert (_pos,
"Bad mojo", x < j)

It could return "foo.sml:4.2" or maybe ("foo.sml", 4, 2) or even
("/home/terpstra/BubbleStorm/demo/foo.sml", 4, 2).
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