Nothing
Code
add_intercept_column(mtcars, name = c("x", "y"))
Condition
Error in `add_intercept_column()`:
! `name` must be a valid name, not a character vector.
Code
add_intercept_column(mtcars, name = 1)
Condition
Error in `add_intercept_column()`:
! `name` must be a valid name, not the number 1.
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