bad argument #1 to 'unpack' (table expected, got string)

[xsh005]

Repro: standard kotlin project

// src/test/kotlin/foo/FooTest.kt
package test

import org.junit.Test
import java.io.ByteArrayOutputStream
import java.io.PrintStream
import kotlin.test.assertEquals

class TestTest {
    @Test
    fun `example test`() {
        | <- cursor is here
    }
}

Press assertEquals, 0, and then <Tab>