《太平广记·卷四百七十四·昆虫二》
上都浑瑊的家里，在大门外有一棵小槐树，树上有个洞象铜钱那么大。
上都浑瑊宅，戟门外一小槐树，树有穴大如钱。
There was a small locust tree outside the gate of Shangdu Hunfan's house, and there was a hole in the tree as big as a copper coin.