1 files changed, 27 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/expressions/in/private-field-invalid-rhs.js b/js/src/tests/test262/language/expressions/in/private-field-invalid-rhs.js
new file mode 100644
index 0000000000..fb8783d019
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/in/private-field-invalid-rhs.js
@@ -0,0 +1,27 @@
+// |reftest| error:SyntaxError
+// Copyright 2021 the V8 project authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Syntactic grammar restricts right-hand side
+info: |
+  Syntax
+    RelationalExpression[In, Yield, Await]:
+    [...]
+    [+In]PrivateIdentifier in ShiftExpression[?Yield, ?Await]
+esid: sec-relational-operators-runtime-semantics-evaluation
+negative:
+  phase: parse
+  type: SyntaxError
+features: [class-fields-private, class-fields-private-in]
+---*/
+
+$DONOTEVALUATE();
+
+class C {
+  #field;
+
+  constructor() {
+    #field in () => {};
+  }
+}