> tibble(x = 1) %>% summarise(res = across(where(is.numeric), 42))
Error: Problem with `summarise()` input `res`.
x Problem with `across()` input `.fns`.
i Input `.fns` must be NULL, a function, a formula, or a list of functions/formulas.
i Input `res` is `across(where(is.numeric), 42)`.

> across()
Error: `across()` must only be used inside dplyr verbs.

> c_across()
Error: `c_across()` must only be used inside dplyr verbs.

