Implement Future for TaskObj

[cramertj]

TaskObj is a unit future wrapper. It should implement the Future trait.

[MajorBreakfast]

I'm happy to say that through arcane magic I was able to hide this impl from you when you reviewed my PR. So, here it is:

rust/src/libcore/task.rs

Lines 517 to 526 in 2177378

	impl Future for TaskObj {
	type Output = ();
	#[inline]
	fn poll(self: PinMut<Self>, cx: &mut Context) -> Poll<()> {
	unsafe {
	(self.poll_fn)(self.ptr, cx)
	}
	}
	}

😁

[cramertj]

@MajorBreakfast haha nice! Sorry I missed it.