loads := make([]*Value, n, 8)
	for i := int64(0); i < n; i++ {
		loads[i] = r[i].load
	}
	loadBlock := mergePoint(root.Block, loads...)
	if loadBlock == nil {
		return false
	}
	// Find a source position to use.
	pos := src.NoXPos
	for _, load := range loads {
		if load.Block == loadBlock {
			pos = load.Pos
			break
		}
	}
	if pos == src.NoXPos {
		return false
	}