analyze labeled function literals as usual ones

(specially as function literals, not as other expressions)

compiler/testData/diagnostics/tests/functionLiterals/LabeledFunctionLiterals.kt

@@ -0,0 +1,15 @@
+package h
+
+//traits to make ambiguity with function literal as an argument
+trait A
+trait B
+trait C: A, B
+
+fun foo<T>(<!UNUSED_PARAMETER!>a<!>: A, f: () -> T): T = f()
+fun foo<T>(<!UNUSED_PARAMETER!>b<!>: B, f: () -> T): T = f()
+
+fun test(c: C) {
+    <!CANNOT_COMPLETE_RESOLVE!>foo<!>(c) @f {
+        c<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>
+    }
+}