resolve elvis operator as call

compiler/testData/diagnostics/tests/resolve/specialConstructions/elvisAsCall.kt

@@ -0,0 +1,34 @@
+package a
+
+trait A
+fun doList(l: List<Int>) = l
+fun doInt(i: Int) = i
+fun getList(): List<Int>? = null
+fun <T> strangeList(f: (T) -> Unit): List<T> = throw Exception("$f")
+fun <T: A> emptyListOfA(): List<T> = throw Exception()
+
+//-------------------------------
+
+fun testElvis(a: Int?, b: Int?) {
+    if (a != null) {
+        doInt(b ?: a)
+    }
+    doList(getList() ?: <!TYPE_INFERENCE_UPPER_BOUND_VIOLATED!>emptyListOfA<!>()) //should be an error
+    doList(getList() ?: strangeList { doInt(it) }) //lambda was not analyzed
+}
+
+
+fun testDataFlowInfo1(a: Int?, b: Int?) {
+    val c: Int = a ?: b!!
+    doInt(c)
+    b + 1
+}
+
+fun testDataFlowInfo2(a: Int?, b: Int?) {
+    doInt(a ?: b!!)
+    b + 1
+}
+
+fun testTypeMismatch(a: String?, b: Any) {
+    doInt(<!TYPE_MISMATCH!>a<!> ?: <!TYPE_MISMATCH!>b<!>)
+}