l = msm('leave').scale(2)
leavepath = msm('leavepath').scale(2)
xxp(ama(l,leavepath))
报错：
Exception: Cannot call Mobject.point_from_proportion for a Mobject with no points
需要改成：
l = msm('leave').scale(2)
leavepath = msm('leavepath').scale(2)
xxp(ama(l,leavepath[0]))
Original: https://www.cnblogs.com/daxiangcai/p/16747710.html
Author: 大湘菜
Title: manim movealongpath 的bug
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