Example `assign` retain cycle.

assign_retain_cycle.swift

import Combine

final class SomeViewModel: ObservableObject {

	// MARK: - Outputs

	@Published var someProperty = () /// (1) Using `Void` for sake of example.

	// MARK: - Private

	private var subscriptions = Set<AnyCancellable>()

	init() {
		somePublisher /// (2) of `Output` type `Void` and `Never`-valued `Failure`.
			.assign(to: \.someProperty, on: self) /// (3) Accidental `strong` catpture of `self`.
			.store(in: &subscriptions)
	}
}