Added diagnostic tests for inference and incorporation

compiler/testData/diagnostics/tests/inference/commonSystem/nestedLambdas.kt

@@ -0,0 +1,10 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+// !CHECK_TYPE
+
+fun <T, R> Collection<T>.map(transform : (T) -> R) : List<R> = throw Exception()
+
+fun test(list: List<List<Int>>) {
+
+    val list1 = list.map { it.map { "$it" } }
+    list1 checkType { _<List<List<String>>>() }
+}