Generate parse error on label without name '@'

compiler/testData/cfg/controlStructures/Finally.kt

@@ -20,9 +20,9 @@ fun t2() {
 fun t3() {
   try {
     1
-    @{ () ->
+    @l{ () ->
         if (2 > 3) {
-          return@
+          return@l
         }
     }
   } finally {
@@ -31,11 +31,11 @@ fun t3() {
 }
 
 fun t4() {
-  @{ () ->
+  @l{ () ->
     try {
       1
       if (2 > 3) {
-        return@
+        return@l
       }
     } finally {
       2
@@ -44,11 +44,11 @@ fun t4() {
 }
 
 fun t5() {
-  @ while(true) {
+  @l while(true) {
     try {
       1
       if (2 > 3) {
-        break @
+        break @l
       }
     } finally {
       2
@@ -58,10 +58,10 @@ fun t5() {
 
 fun t6() {
   try {
-    @ while(true) {
+    @l while(true) {
         1
         if (2 > 3) {
-          break @
+          break @l
         }
       }
       5
@@ -72,10 +72,10 @@ fun t6() {
 
 fun t7() {
   try {
-    @ while(true) {
+    @l while(true) {
         1
         if (2 > 3) {
-          break @
+          break @l
         }
       }
   } finally {
@@ -84,11 +84,11 @@ fun t7() {
 }
 
 fun t8(a : Int) {
-  @ for (i in 1..a) {
+  @l for (i in 1..a) {
     try {
       1
       if (2 > 3) {
-        continue @
+        continue @l
       }
     } finally {
       2
@@ -98,10 +98,10 @@ fun t8(a : Int) {
 
 fun t9(a : Int) {
   try {
-    @ for (i in 1..a) {
+    @l for (i in 1..a) {
         1
         if (2 > 3) {
-          continue @
+          continue @l
         }
       }
       5
@@ -112,10 +112,10 @@ fun t9(a : Int) {
 
 fun t10(a : Int) {
   try {
-    @ for (i in 1..a) {
+    @l for (i in 1..a) {
         1
         if (2 > 3) {
-          continue @
+          continue @l
         }
       }
   } finally {