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

compiler/testData/diagnostics/tests/controlStructures/notAFunctionLabel_after.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!>return@L<!>
+    }
+}
+
+fun testValLabelInReturn() {
+    L@ val fn = { <!NOT_A_FUNCTION_LABEL!>return@L<!> }
+    fn()
+}
+
+fun testHighOrderFunctionCallLabelInReturn() {
+    L@ run {
+        <!NOT_A_FUNCTION_LABEL!>return@L<!>
+    }
+}

compiler/testData/diagnostics/tests/controlStructures/notAFunctionLabel_after.txt

@@ -0,0 +1,20 @@
+package
+
+public fun testAnnotatedLambdaLabel(): () -> kotlin.Unit
+public fun testAnonymousFunctionLabel(): () -> kotlin.Unit
+public fun testFunctionName(): kotlin.Unit
+public fun testHighOrderFunctionCallLabelInReturn(): kotlin.Unit
+public fun testHighOrderFunctionName(): kotlin.Unit
+public fun testLambdaLabel(): () -> kotlin.Unit
+public fun testLambdaMultipleLabels1(): () -> kotlin.Unit
+public fun testLambdaMultipleLabels2(): () -> kotlin.Unit
+public fun testLoopLabelInReturn(/*0*/ xs: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+public fun testParenthesizedLambdaLabel(): () -> kotlin.Unit
+public fun testValLabelInReturn(): kotlin.Unit
+
+@kotlin.annotation.Target(allowedTargets = {AnnotationTarget.EXPRESSION}) @kotlin.annotation.Retention(value = AnnotationRetention.SOURCE) public final annotation class Ann : kotlin.Annotation {
+    public constructor Ann()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}

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<!>
+    }
+}

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

@@ -0,0 +1,20 @@
+package
+
+public fun testAnnotatedLambdaLabel(): () -> kotlin.Unit
+public fun testAnonymousFunctionLabel(): () -> kotlin.Unit
+public fun testFunctionName(): kotlin.Unit
+public fun testHighOrderFunctionCallLabelInReturn(): kotlin.Unit
+public fun testHighOrderFunctionName(): kotlin.Unit
+public fun testLambdaLabel(): () -> kotlin.Unit
+public fun testLambdaMultipleLabels1(): () -> kotlin.Unit
+public fun testLambdaMultipleLabels2(): () -> kotlin.Unit
+public fun testLoopLabelInReturn(/*0*/ xs: kotlin.collections.List<kotlin.Int>): kotlin.Unit
+public fun testParenthesizedLambdaLabel(): () -> kotlin.Unit
+public fun testValLabelInReturn(): kotlin.Unit
+
+@kotlin.annotation.Target(allowedTargets = {AnnotationTarget.EXPRESSION}) @kotlin.annotation.Retention(value = AnnotationRetention.SOURCE) public final annotation class Ann : kotlin.Annotation {
+    public constructor Ann()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}