1 files changed, 37 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/literals/bigint/numeric-separators/numeric-separator-literal-dd-nsl-dds-dunder-err.js b/js/src/tests/test262/language/literals/bigint/numeric-separators/numeric-separator-literal-dd-nsl-dds-dunder-err.js
new file mode 100644
index 0000000000..39c50502c0
--- /dev/null
+++ b/js/src/tests/test262/language/literals/bigint/numeric-separators/numeric-separator-literal-dd-nsl-dds-dunder-err.js
@@ -0,0 +1,37 @@
+// |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 appear adjacent to another
+  NumericLiteralSeparator in a DecimalIntegerLiteral
+info: |
+  NumericLiteral ::
+    DecimalIntegerLiteral BigIntLiteralSuffix
+    NumericLiteralBase BigIntLiteralSuffix
+
+  NumericLiteralBase ::
+    BinaryIntegerLiteral
+    OctalIntegerLiteral
+    HexIntegerLiteral
+
+  BigIntLiteralSuffix :: n
+
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+negative:
+  phase: parse
+  type: SyntaxError
+features: [BigInt, numeric-separator-literal]
+---*/
+
+$DONOTEVALUATE();
+
+1__0123456789n;