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diff --git a/js/src/tests/test262/language/literals/numeric/numeric-separators/numeric-separator-literal-dil-dot-nsl-err.js b/js/src/tests/test262/language/literals/numeric/numeric-separators/numeric-separator-literal-dil-dot-nsl-err.js
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index 0000000000..945ff12dab
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+++ b/js/src/tests/test262/language/literals/numeric/numeric-separators/numeric-separator-literal-dil-dot-nsl-err.js
@@ -0,0 +1,30 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2017 the V8 project authors. 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 last digit character of a
+ DecimalLiteral
+info: |
+ NumericLiteralSeparator ::
+ _
+
+ DecimalLiteral ::
+ DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+ DecimalDigits ::
+ ...
+ DecimalDigits NumericLiteralSeparator DecimalDigit
+
+negative:
+ phase: parse
+ type: SyntaxError
+
+features: [numeric-separator-literal]
+---*/
+
+$DONOTEVALUATE();
+
+10._