Looks like bug in description

[semoro]

interface Item
class Number(val value: Int) : Item
class Variable(val name: String) : Item

object ItemsParser : Grammar<Item>() {
    val num by token("\\d+")
    val word by token("[A-Za-z]")
    val comma by token(",\\s+")

    val numParser = num use { Number(text.toInt()) }
    val varParser = word use { Variable(text) }

    override val <!PROPERTY_TYPE_MISMATCH_ON_OVERRIDE!>rootParser<!> = separatedTerms(numParser or varParser, comma)
}

val result: List<Item> = ItemsParser.<!TYPE_INFERENCE_EXPECTED_TYPE_MISMATCH!>parseToEnd("one, 2, three, 4, five")<!>

Some errors reported on code copied from README

[semoro]

I think, T for Grammar should be List<Item> here

[h0tk3y]

Fixed, thanks.