wallclock

type Timer interface {
	C() <-chan time.Time
	Reset(d time.Duration) bool
	Stop() bool
}

type WallClock interface {
	WithTimeoutCause(
		parent context.Context,
		timeout time.Duration,
		cause error,
	) (context.Context, context.CancelFunc)
	After(d time.Duration) <-chan time.Time
	NewTimer(d time.Duration) Timer
	Now() time.Time
}