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diff --git a/js/src/tests/test262/built-ins/RegExp/property-escapes/grammar-extension-unopened-negated.js b/js/src/tests/test262/built-ins/RegExp/property-escapes/grammar-extension-unopened-negated.js
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+++ b/js/src/tests/test262/built-ins/RegExp/property-escapes/grammar-extension-unopened-negated.js
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+// |reftest| error:SyntaxError
+// Copyright 2018 Mathias Bynens. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+author: Mathias Bynens
+description: >
+ This tests violations of the grammar starting here:
+
+ CharacterClassEscape[U]::
+ [+U] p{ UnicodePropertyValueExpression }
+ [+U] P{ UnicodePropertyValueExpression }
+esid: prod-CharacterClassEscape
+negative:
+ phase: parse
+ type: SyntaxError
+features: [regexp-unicode-property-escapes]
+---*/
+
+$DONOTEVALUATE();
+
+/\P}/u;