Renaming multiple columns with dplyr rename(across(

We can use rename_with instead of rename

library(dplyr)   
library(stringr)
data %>%
      rename_with(~str_c("Last_", .), everything())

Reproducible example

data(iris)
head(iris) %>% 
    rename_with(~str_c("Last_", .), .cols = everything())
#  Last_Sepal.Length Last_Sepal.Width Last_Petal.Length Last_Petal.Width Last_Species
#1               5.1              3.5               1.4              0.2       setosa
#2               4.9              3.0               1.4              0.2       setosa
#3               4.7              3.2               1.3              0.2       setosa
#4               4.6              3.1               1.5              0.2       setosa
#5               5.0              3.6               1.4              0.2       setosa
#6               5.4              3.9               1.7              0.4       setosa

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According to ?rename

rename() changes the names of individual variables using new_name = old_name syntax; rename_with() renames columns using a function.

and in ?across

across() makes it easy to apply the same transformation to multiple columns, allowing you to use select() semantics inside in summarise() and mutate().

The description says its use within mutate/summarise (and transmute?), and no indication of usage with any other functions i.e. it would fail with select