Assertion failed
assert("Hello" !in listOf("Hello", "World"))
               |   |
               |   [Hello, World]
               false

Assertion failed
assert(" !in " !in listOf(" !in "))
               |   |
               |   [ !in ]
               false

Assertion failed
assert(
    " !in "

            !in
            |
            false

            listOf(" !in ")
            |
            [ !in ]
)

Assertion failed
assert("Hello"/*!in*/!in/*!in*/listOf("Hello", "World"))
                     |         |
                     |         [Hello, World]
                     false

Assertion failed
assert(("Hello" !in listOf("Hello", "World")) !in listOf(false))
                |   |                         |   |
                |   |                         |   [false]
                |   |                         false
                |   [Hello, World]
                false