Fix using qualified this with labeled function literals

#KT-9251 Fixed

compiler/frontend/src/org/jetbrains/kotlin/types/expressions/LabelResolver.kt

@@ -182,19 +182,14 @@ object LabelResolver {
         }
         else if (size == 0) {
             val element = resolveNamedLabel(labelName, targetLabel, context.trace)
-            if (element is KtFunctionLiteral) {
-                val declarationDescriptor = context.trace.bindingContext.get(BindingContext.DECLARATION_TO_DESCRIPTOR, element)
-                if (declarationDescriptor is FunctionDescriptor) {
-                    val thisReceiver = declarationDescriptor.extensionReceiverParameter
-                    if (thisReceiver != null) {
-                        context.trace.record(LABEL_TARGET, targetLabel, element)
-                        context.trace.record(REFERENCE_TARGET, referenceExpression, declarationDescriptor)
-                    }
-                    return LabeledReceiverResolutionResult.labelResolutionSuccess(thisReceiver)
-                }
-                else {
-                    context.trace.report(UNRESOLVED_REFERENCE.on(targetLabel, targetLabel))
+            val declarationDescriptor = context.trace.bindingContext[BindingContext.DECLARATION_TO_DESCRIPTOR, element]
+            if (declarationDescriptor is FunctionDescriptor) {
+                val thisReceiver = declarationDescriptor.extensionReceiverParameter
+                if (thisReceiver != null) {
+                    context.trace.record(LABEL_TARGET, targetLabel, element)
+                    context.trace.record(REFERENCE_TARGET, referenceExpression, declarationDescriptor)
                 }
+                return LabeledReceiverResolutionResult.labelResolutionSuccess(thisReceiver)
             }
             else {
                 context.trace.report(UNRESOLVED_REFERENCE.on(targetLabel, targetLabel))

compiler/testData/diagnostics/tests/labels/labeledFunctionLiteral.kt

@@ -0,0 +1,17 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE
+
+val funLit = lambda@ fun String.() {
+    val d1 = this@lambda
+}
+
+fun test() {
+    val funLit = lambda@ fun String.(): String {
+        return this@lambda
+    }
+}
+
+fun lambda() {
+    val funLit = lambda@ fun String.(): String {
+        return <!NO_THIS!>this@lambda<!>
+    }
+}

compiler/testData/diagnostics/tests/labels/labeledFunctionLiteral.txt

@@ -0,0 +1,5 @@
+package
+
+public val funLit: kotlin.String.() -> kotlin.Unit
+public fun lambda(): kotlin.Unit
+public fun test(): kotlin.Unit

compiler/tests/org/jetbrains/kotlin/checkers/DiagnosticsTestGenerated.java

@@ -12670,6 +12670,12 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("labeledFunctionLiteral.kt")
+            public void testLabeledFunctionLiteral() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/labels/labeledFunctionLiteral.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("labelsMustBeNamed.kt")
             public void testLabelsMustBeNamed() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/diagnostics/tests/labels/labelsMustBeNamed.kt");