1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/literals/bigint/numeric-separators/numeric-separator-literal-hil-hd-nsl-hd-err.js b/js/src/tests/test262/language/literals/bigint/numeric-separators/numeric-separator-literal-hil-hd-nsl-hd-err.js
new file mode 100644
index 0000000000..4c4b465f6c
--- /dev/null
+++ b/js/src/tests/test262/language/literals/bigint/numeric-separators/numeric-separator-literal-hil-hd-nsl-hd-err.js
@@ -0,0 +1,45 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: prod-NumericLiteralSeparator
+description: >
+  NumericLiteralSeparator may not be the appear adjacent to `0x` | `0X` in a
+  HexIntegerLiteral
+info: |
+  NumericLiteral ::
+    DecimalIntegerLiteral BigIntLiteralSuffix
+    NumericLiteralBase BigIntLiteralSuffix
+
+  NumericLiteralBase ::
+    BinaryIntegerLiteral
+    OctalIntegerLiteral
+    HexIntegerLiteral
+
+  BigIntLiteralSuffix :: n
+
+  NumericLiteralSeparator ::
+    _
+
+  HexIntegerLiteral ::
+    0x HexDigits
+    0X HexDigits
+
+  HexDigits ::
+    HexDigit
+    HexDigits HexDigit
+    HexDigits NumericLiteralSeparator HexDigit
+
+  HexDigit::one of
+    0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F
+
+negative:
+  phase: parse
+  type: SyntaxError
+features: [BigInt, numeric-separator-literal]
+---*/
+
+$DONOTEVALUATE();
+
+0x_1n;