createdAt:  nowFunc(),
		returnedAt: nowFunc(),
		ci:         ci,
		inUse:      true,
	}
	db.addDepLocked(dc, dc)
	db.mu.Unlock()
	return dc, nil
}

// putConnHook is a hook for testing.
var putConnHook func(*DB, *driverConn)

// noteUnusedDriverStatement notes that ds is no longer used and should
// be closed whenever possible (when c is next not in use), unless c is
// already closed.

	getFreedFrom := func(c dbConn) string {
		mu.Lock()
		defer mu.Unlock()
		return freedFrom[c]
	}
	setFreedFrom := func(c dbConn, s string) {
		mu.Lock()
		defer mu.Unlock()
		freedFrom[c] = s
	}
	putConnHook = func(db *DB, c *driverConn) {
		if slices.Contains(db.freeConn, c) {
			// print before panic, as panic may get lost due to conflicting panic
			// (all goroutines asleep) elsewhere, since we might not unlock