grammar: guard clause following pattern in lambda (#6)

Author: Tuxified

grammar.js

@@ -494,6 +494,7 @@ module.exports = grammar({
     lambda_clause: ($) =>
       seq(
         field("arguments", args($.pattern)),
+        opt($.guard_clause),
         ARROW,
         field("body", sepBy(COMMA, $.expression))
       ),

src/grammar.json

@@ -2900,6 +2900,18 @@
             }
           }
         },
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "SYMBOL",
+              "name": "guard_clause"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "STRING",
           "value": "->"

src/node-types.json

@@ -4813,6 +4813,16 @@
           }
         ]
       }
+    },
+    "children": {
+      "multiple": false,
+      "required": false,
+      "types": [
+        {
+          "type": "guard_clause",
+          "named": true
+        }
+      ]
     }
   },
   {