Created automatic labeling of function expression.

compiler/testData/diagnostics/tests/functionAsExpression/AutoLabels.kt

@@ -0,0 +1,15 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
+
+fun <T, R> Iterable<T>.map(transform: (T) -> R): List<R> = null!!
+
+fun autolabel(l: List<Int>) = l.map (fun (i: Int): Int {
+    return@map 4
+})
+
+fun unresolvedMapLabel(l: List<Int>) = l.map (fun test(i: Int): Int {
+    return<!UNRESOLVED_REFERENCE!>@map<!> 4
+})
+
+fun labelToFunName(l: List<Int>) = l.map (fun test(i: Int): Int {
+    return@test 4
+})