-- in.cue --
root: {
	a: {
		$id: "failure"
		val: "foo"
		out: string
	}
	b: {
		$id:    "valToOut"
		$after: a
		val:    "bar"
		out:    string
	}
}
-- out/run/errors --
error: task failed: failure
-- out/run/t0 --
graph TD
  t0("root.a [Ready]")
  t1("root.b [Waiting]")
  t1-->t0

-- out/run/stats/totals --
Leaks:  0
Freed:  0
Reused: 0
Allocs: 0
Retain: 0

Unifications: 0
Conjuncts:    0
Disjuncts:    0