fix: initializer lists can be the RHS of an assignment expression

grammar.js

@@ -1177,18 +1177,27 @@ module.exports = grammar(C, {
       $.qualified_identifier,
     ),
 
-    assignment_expression: ($, original) => choice(
-      original,
-      prec.right(PREC.ASSIGNMENT, seq(
-        field('left', $._assignment_left_expression),
-        field('operator', choice(
-          'and_eq',
-          'or_eq',
-          'xor_eq',
-        )),
-        field('right', $._expression),
+    assignment_expression: $ => prec.right(PREC.ASSIGNMENT, seq(
+      field('left', $._assignment_left_expression),
+      field('operator', choice(
+        '=',
+        '*=',
+        '/=',
+        '%=',
+        '+=',
+        '-=',
+        '<<=',
+        '>>=',
+        '&=',
+        '^=',
+        '|=',
+        'and_eq',
+        'or_eq',
+        'xor_eq',
       )),
-    ),
+      field('right', choice($._expression, $.initializer_list)),
+    )),
+
 
     operator_name: $ => prec(1, seq(
       'operator',

test/corpus/expressions.txt

@@ -236,6 +236,40 @@ int main() {
               (true)
               (false))))))))
 
+================================================================================
+Initializer list as assignment expression RHS
+================================================================================
+
+void test() {
+    int b = int{1};
+    b = int{2};
+}
+
+--------------------------------------------------------------------------------
+
+(translation_unit
+  (function_definition
+    (primitive_type)
+    (function_declarator
+      (identifier)
+      (parameter_list))
+    (compound_statement
+      (declaration
+        (primitive_type)
+        (init_declarator
+          (identifier)
+          (compound_literal_expression
+            (primitive_type)
+            (initializer_list
+              (number_literal)))))
+      (expression_statement
+        (assignment_expression
+          (identifier)
+          (compound_literal_expression
+            (primitive_type)
+            (initializer_list
+              (number_literal))))))))
+
 ================================================================================
 Lambda expressions
 ================================================================================