toString
Returns the string representation of this collection.
Implementations of this function should behave like calling the Any.toString function on an Iterable.
Calling from Kotlin
Here's an example of calling this function from Kotlin code:
val collection: NotEmptyCollection<Int> = notEmptyListOf(1, 2, 3)
val actual = "$collection"
val expected = "${listOf(1, 2, 3)}"
assertEquals(expected, actual)
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