Definition of "foregone"

For with the dream foregone, foregone,The deed forborne for ever,The worm, regret, will canker on,And time will turn him never.

1874, William Henley, O, Gather Me the Rose

I know people are still going through the details but it's not a foregone conclusion that it will get confirmation by the Senate.

2018 October 2, Erik Wasson, quoting John Cornyn, “Senate Approval of New Nafta Not a 'Foregone Conclusion,’ Republican Says”, in Bloomberg‎