Add 'element' field name to list

grammar.js

@@ -169,7 +169,7 @@ module.exports = grammar({
 
     list_expression: ($) => seq(
       "[",
-      optional(commaSeparated($._expr)),
+      optional(commaSeparated(field("element", $._expr))),
       "]",
     ),
 

src/grammar.json

@@ -682,8 +682,12 @@
               "type": "SEQ",
               "members": [
                 {
+                  "type": "FIELD",
+                  "name": "element",
+                  "content": {
                     "type": "SYMBOL",
                     "name": "_expr"
+                  }
                 },
                 {
                   "type": "REPEAT",
@@ -695,9 +699,13 @@
                         "value": ","
                       },
                       {
+                        "type": "FIELD",
+                        "name": "element",
+                        "content": {
                           "type": "SYMBOL",
                           "name": "_expr"
                         }
+                      }
                     ]
                   }
                 },

src/node-types.json

@@ -158,8 +158,8 @@
   {
     "type": "list_expression",
     "named": true,
-    "fields": {},
+    "fields": {
-    "children": {
+      "element": {
         "multiple": true,
         "required": false,
         "types": [
@@ -197,6 +197,7 @@
           }
         ]
       }
+    }
   },
   {
     "type": "map_expression",