chore: generate

src/grammar.json

@@ -4461,12 +4461,20 @@
             "value": "?"
           },
           {
-            "type": "FIELD",
-            "name": "consequence",
-            "content": {
-              "type": "SYMBOL",
-              "name": "_expression"
-            }
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "FIELD",
+                "name": "consequence",
+                "content": {
+                  "type": "SYMBOL",
+                  "name": "_expression"
+                }
+              },
+              {
+                "type": "BLANK"
+              }
+            ]
           },
           {
             "type": "STRING",

src/node-types.json

@@ -1116,7 +1116,7 @@
       },
       "consequence": {
         "multiple": false,
-        "required": true,
+        "required": false,
         "types": [
           {
             "type": "_expression",