KT-22274 report error/warning on incorrect return target label

compiler/testData/diagnostics/tests/controlStructures/notAFunctionLabel_before.kt

@@ -0,0 +1,62 @@
+// !LANGUAGE: -RestrictReturnStatementTarget
+
+@Target(AnnotationTarget.EXPRESSION)
+@Retention(AnnotationRetention.SOURCE)
+annotation class Ann
+
+fun testFunctionName() {
+    return@testFunctionName
+}
+
+fun testHighOrderFunctionName() {
+    run {
+        return@run
+    }
+}
+
+fun testLambdaLabel() =
+    lambda@ {
+        return@lambda
+    }
+
+fun testParenthesizedLambdaLabel() =
+    lambda@ ( {
+        return@lambda
+    } )
+
+fun testAnnotatedLambdaLabel() =
+    lambda@ @Ann {
+        return@lambda
+    }
+
+fun testLambdaMultipleLabels1() =
+    lambda1@ lambda2@ {
+        return@lambda1
+    }
+
+fun testLambdaMultipleLabels2() =
+    lambda1@ lambda2@ {
+        return@lambda2
+    }
+
+fun testAnonymousFunctionLabel() =
+    anonFun@ fun() {
+        return@anonFun
+    }
+
+fun testLoopLabelInReturn(xs: List<Int>) {
+    L@ for (x in xs) {
+        if (x > 0) <!NOT_A_FUNCTION_LABEL_WARNING!>return@L<!>
+    }
+}
+
+fun testValLabelInReturn() {
+    L@ val fn = { <!NOT_A_FUNCTION_LABEL_WARNING!>return@L<!> }
+    fn()
+}
+
+fun testHighOrderFunctionCallLabelInReturn() {
+    L@ run {
+        <!NOT_A_FUNCTION_LABEL_WARNING!>return@L<!>
+    }
+}