fix: grammar

Author: long2ice

.github/workflows/build.yml

@@ -9,7 +9,7 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@v2
         with:
-          node-version: '12'
+          node-version: '16'
           cache: 'npm'
       - name: Install dependencies
         run: npm install

Cargo.lock

@@ -749,7 +749,7 @@ module.exports = grammar({
 
     type_arguments: $ => seq("<", sep1($.type_projection, ","), ">"),
 
-    value_arguments: $ => seq("(", optional(sep1($.value_argument, ",")), ")"),
+    value_arguments: $ => seq("(", optional(sep1($.value_argument, ",")), optional(","), ")"),
 
     value_argument: $ => seq(
       optional($.annotation),