test(KT-47096): add tests for the uncovered behavior.

compiler/testData/codegen/box/vararg/useSuspendFunResultAsVararg.kt

@@ -0,0 +1,36 @@
+// WITH_RUNTIME
+// WITH_COROUTINES
+
+import helpers.*
+import kotlin.coroutines.*
+
+fun builder(c: suspend () -> Unit) {
+    c.startCoroutine(EmptyContinuation)
+}
+
+class TodoItem(var value: String, var completed: Boolean) {
+    override fun toString(): String {
+        return "TodoItem(value='$value', completed=$completed)"
+    }
+}
+
+suspend fun getFromApi(): TodoItem {
+    return TodoItem("Test", false)
+}
+
+fun emulateLog(vararg strings: String): String {
+    return strings[0]
+}
+
+fun box(): String {
+    var stringifiedResult = ""
+
+    builder {
+        stringifiedResult = emulateLog("Result: " + getFromApi())
+    }
+
+    if (stringifiedResult != "Result: TodoItem(value='Test', completed=false)") {
+        return "Failed: Unexpected result ($stringifiedResult)"
+    }
+    return "OK"
+}