为什么在以下情况下传播无效？

Question

我有以下数据

enter code here
    x = c('012015','012015','070956','070956','074351')
    y = c('011220','G20084','G20547','G20548','G70575')

df = as.data.frame(x)
df$y = y

我尝试了从tidyverse进行传播，但是它抛出错误“错误：行的标识符重复”

temp = df %>% spread(key = x, value = y)

In need result as below