And allow them as macro identifiers

Author: calixteman

grammar.js

@@ -129,7 +129,10 @@ module.exports = grammar({
 
       return seq(
         'macro_rules!',
-        field('name', $.identifier),
+        field('name', choice(
+          $.identifier,
+          $._reserved_identifier,
+        )),
         choice(
           seq('(', rules, ')', ';'),
           seq('{', rules, '}')
@@ -877,7 +880,8 @@ module.exports = grammar({
     macro_invocation: $ => seq(
       field('macro', choice(
         $.scoped_identifier,
-        $.identifier
+        $.identifier,
+        $._reserved_identifier,
       )),
       '!',
       $.token_tree

src/grammar.json

@@ -152,8 +152,17 @@
           "type": "FIELD",
           "name": "name",
           "content": {
-            "type": "SYMBOL",
-            "name": "identifier"
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "identifier"
+              },
+              {
+                "type": "SYMBOL",
+                "name": "_reserved_identifier"
+              }
+            ]
           }
         },
         {
@@ -4852,6 +4861,10 @@
               {
                 "type": "SYMBOL",
                 "name": "identifier"
+              },
+              {
+                "type": "SYMBOL",
+                "name": "_reserved_identifier"
               }
             ]
           }