Code
fct_c(1)
Condition
Error in `fct_c()`:
! All elements of `...` must be factors.
Code
fct_unify(list(1))
Condition
Error in `fct_unify()`:
! All elements of `fs` must be factors.
Code
fct_unify(list(factor()), levels = 1)
Condition
Error in `fct_unify()`:
! `levels` must be a character vector, not the number 1.
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