Parse ranges + concat is "++"

tree-sitter-kerolox/grammar.js

@@ -155,7 +155,7 @@ export default grammar({
     binary_expr: $ => choice(
       expr_prec($.expr, 4, choice("*", "/")),
       expr_prec($.expr, 3, choice("+", "-")),
-      expr_prec($.expr, 2, ".."),
+      expr_prec($.expr, 2, choice("..", "++")),
       expr_prec($.expr, 1, choice("=", "!=", ">=", "<=", "<", ">")),
       expr_prec($.expr, 0, choice("&&", "||")),
     ),

tree-sitter-kerolox/src/grammar.json

@@ -962,8 +962,17 @@
                 "type": "FIELD",
                 "name": "op",
                 "content": {
-                  "type": "STRING",
-                  "value": ".."
+                  "type": "CHOICE",
+                  "members": [
+                    {
+                      "type": "STRING",
+                      "value": ".."
+                    },
+                    {
+                      "type": "STRING",
+                      "value": "++"
+                    }
+                  ]
                 }
               },
               {

tree-sitter-kerolox/src/node-types.json

@@ -131,6 +131,10 @@
             "type": "+",
             "named": false
           },
+          {
+            "type": "++",
+            "named": false
+          },
           {
             "type": "-",
             "named": false
@@ -639,6 +643,10 @@
     "type": "+",
     "named": false
   },
+  {
+    "type": "++",
+    "named": false
+  },
   {
     "type": ",",
     "named": false