Nothing
Code
shade(NULL)
Condition
Error in `shade()`:
! Input must not be NULL
Input is <NULL>
Code
shade(numeric(0))
Condition
Error in `shade()`:
! input to shade must have length > 0
Code
shade(list())
Condition
Error in `shade()`:
! input to shade must have length > 0
Code
shade(list(3, list(1), c(2, 3), list()), broken = 3)
Condition
Error in `shade()`:
! additional levels of missing are not available when shade-ing lists column
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