Remove trailing commas in 'select_value' arguments

grammar.js

@@ -2,6 +2,10 @@ function commaSeparated(elem) {
   return seq(elem, repeat(seq(",", elem)), optional(","))
 }
 
+function commaSeparatedNoTrailing(elem) {
+  return seq(elem, repeat(seq(",", elem)))
+}
+
 function trailingCommaSeparated(elem) {
   return repeat(seq(elem, ","))
 }
@@ -130,7 +134,7 @@ module.exports = grammar({
     select_value: ($) => seq(
       field("name", $.identifier),
       "(",
-      field("arguments", optional(commaSeparated($._string_literal))),
+      field("arguments", optional(commaSeparatedNoTrailing($._string_literal))),
       ")",
     ),
 

src/grammar.json

@@ -529,18 +529,6 @@
                         }
                       ]
                     }
-                  },
-                  {
-                    "type": "CHOICE",
-                    "members": [
-                      {
-                        "type": "STRING",
-                        "value": ","
-                      },
-                      {
-                        "type": "BLANK"
-                      }
-                    ]
                   }
                 ]
               },

test/corpus/select.txt

@@ -226,6 +226,34 @@ foo = select(release_variable("ONE", "TWO"), {
           (default)
           (interpreted_string_literal))))))
 
+================================================================================
+Select (trailing comma in arguments)
+================================================================================
+
+foo = select(some_boolean("VALUE",), {
+    true: "true",
+    false: "false",
+})
+
+--------------------------------------------------------------------------------
+
+(source_file
+  (assignment
+    (identifier)
+    (operator)
+    (select_expression
+      (select_value
+        (identifier)
+        (interpreted_string_literal)
+        (ERROR))
+      (select_cases
+        (select_case
+          (boolean_literal)
+          (interpreted_string_literal))
+        (select_case
+          (boolean_literal)
+          (interpreted_string_literal))))))
+
 ================================================================================
 Select (boolean typed)
 ================================================================================