Nothing
Code
user_facing_function(NULL)
Condition
Error in `check_is_named_list()`:
x `somevar` must be a list, not NULL.
Code
user_facing_function(c(a = "a", b = "b"))
Condition
Error in `check_is_named_list()`:
x `somevar` must be a list, not a character vector.
Code
user_facing_function(list("a", b = 2))
Condition
Error in `check_is_named_list()`:
x Names of `somevar` must be non-missing, non-empty, and non-duplicated.
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