is this parent useless ? (@vue/reactivity effect.ts L90-L97)

[jcc1997]

core/packages/reactivity/src/effect.ts

Lines 90 to 97 in 769e555

	let parent: ReactiveEffect | undefined = activeEffect
	let lastShouldTrack = shouldTrack
	while (parent) {
	if (parent === this) {
	return
	}
	parent = parent.parent
	}

What this parent for? I can't see anywhere using it.

[LinusBorg]

it's just needed for doing this recursive loop - a loop which can potentially return from the run function early.