Nothing
Code
check_factor(NA)
Condition
Error:
! `NA` must be a factor or character vector, not `NA`.
Code
check_factor_list(1)
Condition
Error:
! `1` must be a list, not a number.
Code
check_factor_list(list(1))
Condition
Error:
! All elements of `list(1)` must be factors.
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