feat: allow reserved identifiers in element_value_pair

Author: amaanq

grammar.js

@@ -729,7 +729,7 @@ module.exports = grammar({
     ),
 
     element_value_pair: $ => seq(
-      field('key', $.identifier),
+      field('key', choice($.identifier, $._reserved_identifier)),
       '=',
       field('value', $._element_value),
     ),

test/corpus/expressions.txt

@@ -512,7 +512,7 @@ annotation
 ================================================================================
 
 @SuppressWarnings(value = "unchecked")
-@GwtCompatible(emulated = true)
+@GwtCompatible(module = "foo", emulated = true)
 class Duck {
 
 }
@@ -532,6 +532,10 @@ class Duck {
       (annotation
         (identifier)
         (annotation_argument_list
+          (element_value_pair
+            (identifier)
+            (string_literal
+              (string_fragment)))
           (element_value_pair
             (identifier)
             (true)))))