1 files changed, 41 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/in/private-field-rhs-await-absent.js b/js/src/tests/test262/language/expressions/in/private-field-rhs-await-absent.js
new file mode 100644
index 0000000000..c2b12ad402
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/in/private-field-rhs-await-absent.js
@@ -0,0 +1,41 @@
+// Copyright 2021 the V8 project authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Parsing observes the `Await` production parameter when absent
+info: |
+  Syntax
+    RelationalExpression[In, Yield, Await]:
+    [...]
+    [+In]PrivateIdentifier in ShiftExpression[?Yield, ?Await]
+
+  [...]
+
+  1. Let privateIdentifier be the StringValue of PrivateIdentifier.
+  2. Let rref be the result of evaluating ShiftExpression.
+  3. Let rval be ? GetValue(rref).
+  4. If Type(rval) is not Object, throw a TypeError exception.
+esid: sec-relational-operators-runtime-semantics-evaluation
+features: [class-fields-private, class-fields-private-in]
+---*/
+
+let value;
+function await() {
+  return value;
+}
+
+class C {
+  #field;
+
+  static isNameIn() {
+    return #field in await(null);
+  }
+}
+
+value = new C();
+assert.sameValue(C.isNameIn(), true);
+
+value = {};
+assert.sameValue(C.isNameIn(), false);
+
+reportCompare(0, 0);