Nothing
Code
freq(c("a", "b"), TRUE)
Condition
Error in `freq()`:
! `...` must be empty.
x Problematic argument:
* ..1 = TRUE
i Did you forget to name an argument?
Code
freq(1:5)
Condition
Error in `freq()`:
! `x` must be a character vector.
Code
freq(c("a", "b"), sort = NA)
Condition
Error in `freq()`:
! `sort` must be `TRUE` or `FALSE`.
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