compiler/testData/diagnostics/tests/unit/nullableUnit.kt - third_party/github/JetBrains/kotlin - Git at Google

 // FIR_IDENTICAL
 fun foo() {}

 val x: Unit? = <!NO_ELSE_IN_WHEN!>when<!> ("A") {
     "B" -> foo()
 }
	// FIR_IDENTICAL
	fun foo() {}

	val x: Unit? = <!NO_ELSE_IN_WHEN!>when<!> ("A") {
	"B" -> foo()
	}