<How to check if a (constrained once) sequence is ...

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How to check if a (constrained once) sequence is empty in Kotlin
How do I check if a sequence is (not) empty, without assuming it can be consumed twice?
In most cases values.any() and values.none() would work (see also here):
fun doSomething(values: Sequence) {
if (values.any()) {
println("We have these values: " + values.joinToString(", "))
} else {
println("We have no values")
}
}

but this fails if the sequence can only be...