Add obsolescent alternate return

Author: ZedThree

grammar.js

@@ -1098,7 +1098,11 @@ module.exports = grammar({
           )
         )
       ),
-      caseInsensitive('return'),
+      seq(
+        caseInsensitive('return'),
+        // Obsolescent alternate return
+        optional($._expression),
+      )
     ),
 
     include_statement: $ => seq(

src/grammar.json

@@ -13230,13 +13230,30 @@
           ]
         },
         {
-          "type": "ALIAS",
-          "content": {
-            "type": "PATTERN",
-            "value": "[rR][eE][tT][uU][rR][nN]"
-          },
-          "named": false,
-          "value": "return"
+          "type": "SEQ",
+          "members": [
+            {
+              "type": "ALIAS",
+              "content": {
+                "type": "PATTERN",
+                "value": "[rR][eE][tT][uU][rR][nN]"
+              },
+              "named": false,
+              "value": "return"
+            },
+            {
+              "type": "CHOICE",
+              "members": [
+                {
+                  "type": "SYMBOL",
+                  "name": "_expression"
+                },
+                {
+                  "type": "BLANK"
+                }
+              ]
+            }
+          ]
         }
       ]
     },

src/node-types.json

@@ -14290,11 +14290,11 @@
   },
   {
     "type": "none",
-    "named": true
+    "named": false
   },
   {
     "type": "none",
-    "named": false
+    "named": true
   },
   {
     "type": "nopass",