update annotations for formal parameters

Author: TimWhiting

grammar.js

@@ -2555,6 +2555,9 @@ module.exports = grammar({
         ),
         _default_named_parameter: $ => choice(
             seq(
+                optional(
+                    $._metadata
+                ),
                 optional(
                     $._required
                 ),
@@ -2567,6 +2570,9 @@ module.exports = grammar({
                 )
             ),
             seq(
+                optional(
+                    $._metadata
+                ),
                 optional(
                     $._required
                 ),

src/grammar.json

@@ -11232,6 +11232,18 @@
         {
           "type": "SEQ",
           "members": [
+            {
+              "type": "CHOICE",
+              "members": [
+                {
+                  "type": "SYMBOL",
+                  "name": "_metadata"
+                },
+                {
+                  "type": "BLANK"
+                }
+              ]
+            },
             {
               "type": "CHOICE",
               "members": [
@@ -11274,6 +11286,18 @@
         {
           "type": "SEQ",
           "members": [
+            {
+              "type": "CHOICE",
+              "members": [
+                {
+                  "type": "SYMBOL",
+                  "name": "_metadata"
+                },
+                {
+                  "type": "BLANK"
+                }
+              ]
+            },
             {
               "type": "CHOICE",
               "members": [

src/node-types.json

@@ -9146,6 +9146,10 @@
           "type": "additive_expression",
           "named": true
         },
+        {
+          "type": "annotation",
+          "named": true
+        },
         {
           "type": "assignment_expression",
           "named": true