1 files changed, 22 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/RegExp/property-escapes/grammar-extension-separator-only.js b/js/src/tests/test262/built-ins/RegExp/property-escapes/grammar-extension-separator-only.js
new file mode 100644
index 0000000000..e23fd43900
--- /dev/null
+++ b/js/src/tests/test262/built-ins/RegExp/property-escapes/grammar-extension-separator-only.js
@@ -0,0 +1,22 @@
+// |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;