added test for nontrivial nested calls

compiler/testData/diagnostics/tests/inference/nestedCalls/nontrivialCallExpression.kt

@@ -0,0 +1,18 @@
+package a
+
+fun foo(l: List<Int>): Int = l.get(0)
+
+fun <T> emptyList(): List<T> = throw Exception()
+
+fun <T: Any> makeNullable(<!UNUSED_PARAMETER!>t<!>: T): T? = null
+
+fun bar(i: Int) = i
+fun bar(a: Any) = a
+
+fun test(array: Array<Int>) {
+    bar(array[foo(emptyList())])
+
+    bar(foo(emptyList()) + foo(a.emptyList()))
+
+    bar(makeNullable(foo(emptyList())) ?: 0)
+}