# assert/nil? Assert a value is nil. Used inside `deftest` blocks. ## Syntax

[assert/nil? $x]

## Parameters - `$x` — the value to check. ## Examples

[assert/nil? $result]
[assert/nil? ($items first)]

## Returns `true` on success; raises a runtime error on failure. ## See Also `assert/not-nil?`, `assert/falsy`, `deftest`