Code
as_shadow(0)
Condition
Error in `as_shadow()`:
! Input must inherit from <data.frame>
We see class: <numeric>
Code
as_shadow("a")
Condition
Error in `as_shadow()`:
! Input must inherit from <data.frame>
We see class: <character>
Code
as_shadow(matrix(airquality))
Condition
Error in `as_shadow()`:
! Input must inherit from <data.frame>
We see class: <matrix/array>
Code
as_shadow(NULL)
Condition
Error in `as_shadow()`:
! Input must not be NULL
Input is <NULL>
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