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diff --git a/js/src/tests/test262/language/module-code/early-dup-top-function-async-generator.js b/js/src/tests/test262/language/module-code/early-dup-top-function-async-generator.js
new file mode 100644
index 0000000000..9a9b0b5032
--- /dev/null
+++ b/js/src/tests/test262/language/module-code/early-dup-top-function-async-generator.js
@@ -0,0 +1,21 @@
+// |reftest| error:SyntaxError module
+// Copyright 2021 Chengzhong Wu. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-module-semantics-static-semantics-early-errors
+description: >
+    It is a Syntax Error if the LexicallyDeclaredNames of ModuleItemList
+    contains any duplicate entries.
+    At the top level of a Module, function declarations are treated like
+    lexical declarations rather than like var declarations.
+flags: [module]
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+function x() {}
+async function* x() {}