Assert that an object is NULL — assert_null • assert

Assert that an object is NULL

Usage

assert_null(x, arg = rlang::caller_arg(x), call = rlang::caller_env())

Arguments

x: Object to check.
arg: Name used to refer to x in error messages. Defaults to the name of the expression passed as x.
call: Environment used as the error's call context. Defaults to the calling function, so errors point at the user's code.

Value

The input x, invisibly.

Examples

assert_null(NULL)