Tests for NumericSeparatorLiteral. Closes gh-1051

test/language/literals/numeric/numeric-separator-literal-bil-bd-nsl-bd-err.js

@@ -0,0 +1,32 @@
+// 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 appear adjacent to `0b` | `0B` in a
+  BinaryIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  BinaryIntegerLiteral ::
+    0b BinaryDigits
+    0B BinaryDigits
+
+  BinaryDigits ::
+    BinaryDigit
+    BinaryDigits BinaryDigit
+    BinaryDigits NumericLiteralSeparator BinaryDigit
+
+  BinaryDigit :: one of
+    0 1
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0b_1

test/language/literals/numeric/numeric-separator-literal-bil-bd-nsl-bd.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0b` | `0B` BinaryDigit NumericLiteralSeparator BinaryDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  BinaryIntegerLiteral ::
+    0b BinaryDigits
+    0B BinaryDigits
+
+  BinaryDigits ::
+    BinaryDigit
+    BinaryDigits BinaryDigit
+    BinaryDigits NumericLiteralSeparator BinaryDigit
+
+  BinaryDigit :: one of
+    0 1
+
+---*/
+
+assert.sameValue(0b0_1, 0b01);
+assert.sameValue(0B0_1, 0B01);

test/language/literals/numeric/numeric-separator-literal-bil-bd-nsl-bds.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0b` | `0B` BinaryDigit NumericLiteralSeparator BinaryDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  BinaryIntegerLiteral ::
+    0b BinaryDigits
+    0B BinaryDigits
+
+  BinaryDigits ::
+    BinaryDigit
+    BinaryDigits BinaryDigit
+    BinaryDigits NumericLiteralSeparator BinaryDigit
+
+  BinaryDigit :: one of
+    0 1
+
+---*/
+
+assert.sameValue(0b0_10, 0b010);
+assert.sameValue(0B0_10, 0B010);

test/language/literals/numeric/numeric-separator-literal-bil-bds-nsl-bd.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0b` | `0B` BinaryDigits NumericLiteralSeparator BinaryDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  BinaryIntegerLiteral ::
+    0b BinaryDigits
+    0B BinaryDigits
+
+  BinaryDigits ::
+    BinaryDigit
+    BinaryDigits BinaryDigit
+    BinaryDigits NumericLiteralSeparator BinaryDigit
+
+  BinaryDigit :: one of
+    0 1
+
+---*/
+
+assert.sameValue(0b01_0, 0b010);
+assert.sameValue(0B01_0, 0B010);

test/language/literals/numeric/numeric-separator-literal-bil-bds-nsl-bds.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0b` | `0B` BinaryDigits NumericLiteralSeparator BinaryDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  BinaryIntegerLiteral ::
+    0b BinaryDigits
+    0B BinaryDigits
+
+  BinaryDigits ::
+    BinaryDigit
+    BinaryDigits BinaryDigit
+    BinaryDigits NumericLiteralSeparator BinaryDigit
+
+  BinaryDigit :: one of
+    0 1
+
+---*/
+
+assert.sameValue(0b01_00, 0b0100);
+assert.sameValue(0B01_00, 0B0100);

test/language/literals/numeric/numeric-separator-literal-bil-nsl-bd-dunder-err.js

@@ -0,0 +1,32 @@
+// 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 appear adjacent to another
+  NumericLiteralSeparator in a BinaryIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  BinaryIntegerLiteral ::
+    0b BinaryDigits
+    0B BinaryDigits
+
+  BinaryDigits ::
+    BinaryDigit
+    BinaryDigits BinaryDigit
+    BinaryDigits NumericLiteralSeparator BinaryDigit
+
+  BinaryDigit :: one of
+    0 1
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0b0__0

test/language/literals/numeric/numeric-separator-literal-bil-nsl-bd-err.js

@@ -0,0 +1,32 @@
+// 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
+  BinaryIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  BinaryIntegerLiteral ::
+    0b BinaryDigits
+    0B BinaryDigits
+
+  BinaryDigits ::
+    BinaryDigit
+    BinaryDigits BinaryDigit
+    BinaryDigits NumericLiteralSeparator BinaryDigit
+
+  BinaryDigit :: one of
+    0 1
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0b0_

test/language/literals/numeric/numeric-separator-literal-dd-dot-dd-ep-sign-minus-dd-nsl-dd.js

@@ -0,0 +1,26 @@
+// 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: >
+  DecimalDigits `.` DecimalDigits ExponentPart_opt `-` DecimalDigits
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  SignedInteger ::
+    ...
+    - DecimalDigits
+    ...
+
+---*/
+
+assert.sameValue(1.0e-1_0, 1.0e-10);

test/language/literals/numeric/numeric-separator-literal-dd-dot-dd-ep-sign-minus-dds-nsl-dd.js

@@ -0,0 +1,26 @@
+// 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: >
+  DecimalDigits `.` DecimalDigits ExponentPart_opt `-` DecimalDigits
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  SignedInteger ::
+    ...
+    - DecimalDigits
+    ...
+
+---*/
+
+assert.sameValue(1.0e-10_0, 1.0e-100);

test/language/literals/numeric/numeric-separator-literal-dd-dot-dd-ep-sign-plus-dd-nsl-dd.js

@@ -0,0 +1,26 @@
+// 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: >
+  DecimalDigits `.` DecimalDigits ExponentPart_opt `+` DecimalDigits
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  SignedInteger ::
+    ...
+    + DecimalDigits
+    ...
+
+---*/
+
+assert.sameValue(1.0e+1_0, 1.0e+10);

test/language/literals/numeric/numeric-separator-literal-dd-dot-dd-ep-sign-plus-dds-nsl-dd.js

@@ -0,0 +1,27 @@
+// 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: >
+  DecimalDigits `.` DecimalDigits ExponentPart_opt `+` DecimalDigits
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  SignedInteger ::
+    ...
+    + DecimalDigits
+    ...
+
+---*/
+
+assert.sameValue(1.0e+10_0, 1.0e+100);
+

test/language/literals/numeric/numeric-separator-literal-dd-nsl-dd-one-of.js

@@ -0,0 +1,34 @@
+// 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: NonZeroDigit NumericLiteralSeparator DecimalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+
+  DecimalDigits ::
+    DecimalDigit
+    ...
+
+  DecimalDigit :: one of
+    0 1 2 3 4 5 6 7 8 9
+
+---*/
+
+assert.sameValue(1_0, 10);
+assert.sameValue(1_1, 11);
+assert.sameValue(1_2, 12);
+assert.sameValue(1_3, 13);
+assert.sameValue(1_4, 14);
+assert.sameValue(1_5, 15);
+assert.sameValue(1_6, 16);
+assert.sameValue(1_7, 17);
+assert.sameValue(1_8, 18);
+assert.sameValue(1_9, 19);

test/language/literals/numeric/numeric-separator-literal-dd-nsl-dds-dunder-err.js

@@ -0,0 +1,24 @@
+// 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 appear adjacent to another
+  NumericLiteralSeparator in a DecimalIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+1__0123456789

test/language/literals/numeric/numeric-separator-literal-dd-nsl-err.js

@@ -0,0 +1,26 @@
+// 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
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+1_

test/language/literals/numeric/numeric-separator-literal-dds-dot-dd-nsl-dd-ep-dd.js

@@ -0,0 +1,25 @@
+// 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: >
+  DecimalDigits `.` DecimalDigits NumericLiteralSeparator DecimalDigits
+  ExponentPart SignedInteger
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+    e E
+
+---*/
+
+assert.sameValue(10.00_01e2, 10.0001e2);

test/language/literals/numeric/numeric-separator-literal-dds-nsl-dd.js

@@ -0,0 +1,26 @@
+// 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: DecimalDigits NumericLiteralSeparator DecimalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+---*/
+
+assert.sameValue(123456789_0, 1234567890);
+assert.sameValue(123456789_1, 1234567891);
+assert.sameValue(123456789_2, 1234567892);
+assert.sameValue(123456789_3, 1234567893);
+assert.sameValue(123456789_4, 1234567894);
+assert.sameValue(123456789_5, 1234567895);
+assert.sameValue(123456789_6, 1234567896);
+assert.sameValue(123456789_7, 1234567897);
+assert.sameValue(123456789_8, 1234567898);
+assert.sameValue(123456789_9, 1234567899);

test/language/literals/numeric/numeric-separator-literal-dds-nsl-dds-dunder-err.js

@@ -0,0 +1,24 @@
+// 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 appear adjacent to another
+  NumericLiteralSeparator in DecimalIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+10__0123456789

test/language/literals/numeric/numeric-separator-literal-dds-nsl-err.js

@@ -0,0 +1,27 @@
+// 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: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+10_

test/language/literals/numeric/numeric-separator-literal-dil-dot-dds-nsl-ep-dd-err.js

@@ -0,0 +1,26 @@
+// 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 appear adjacent to ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+10.0_e1

test/language/literals/numeric/numeric-separator-literal-dil-dot-nsl-ep-err.js

@@ -0,0 +1,29 @@
+// 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 appear between `.` and ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    DecimalIntegerLiteral . DecimalDigits_opt ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+   e E
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+10._e1

test/language/literals/numeric/numeric-separator-literal-dil-dot-nsl-err.js

@@ -0,0 +1,27 @@
+// 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: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+10._

test/language/literals/numeric/numeric-separator-literal-dot-dd-nsl-dd-ep.js

@@ -0,0 +1,25 @@
+// 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: >
+  `.` DecimalDigit NumericLiteralSeparator DecimalDigit ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    DecimalDigit
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+    e E
+
+---*/
+
+assert.sameValue(.0_1e2, .01e2);

test/language/literals/numeric/numeric-separator-literal-dot-dd-nsl-dds-ep.js

@@ -0,0 +1,25 @@
+// 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: >
+  `.` DecimalDigit NumericLiteralSeparator DecimalDigits ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    DecimalDigit
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+    e E
+
+---*/
+
+assert.sameValue(.1_01e2, .101e2);

test/language/literals/numeric/numeric-separator-literal-dot-dds-nsl-dd-ep.js

@@ -0,0 +1,25 @@
+// 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: >
+  `.` DecimalDigits NumericLiteralSeparator DecimalDigit ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    DecimalDigit
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+    e E
+
+---*/
+
+assert.sameValue(.10_1e2, .101e2);

test/language/literals/numeric/numeric-separator-literal-dot-dds-nsl-dds-ep.js

@@ -0,0 +1,25 @@
+// 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: >
+  `.` DecimalDigits NumericLiteralSeparator DecimalDigits ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    DecimalDigit
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+    e E
+
+---*/
+
+assert.sameValue(.00_01e2, .0001e2);

test/language/literals/numeric/numeric-separator-literal-dot-dds-nsl-ep-err.js

@@ -0,0 +1,28 @@
+// 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 appear adjacent to ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+    e E
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+.0_e1

test/language/literals/numeric/numeric-separator-literal-dot-nsl-ep-err.js

@@ -0,0 +1,29 @@
+// 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 appear between `.` and ExponentPart
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+  ExponentIndicator :: one of
+    e E
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+._e1

test/language/literals/numeric/numeric-separator-literal-dot-nsl-err.js

@@ -0,0 +1,27 @@
+// 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, nor adjacent to `.`
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalLiteral ::
+    . DecimalDigits ExponentPart_opt
+
+  DecimalDigits ::
+    ...
+    DecimalDigits NumericLiteralSeparator DecimalDigit
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+._

test/language/literals/numeric/numeric-separator-literal-hil-hd-nsl-hd-err.js

@@ -0,0 +1,32 @@
+// 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 appear adjacent to `0x` | `0X` in a
+  HexIntegerLiteral
+info: |
+  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: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0x_1

test/language/literals/numeric/numeric-separator-literal-hil-hd-nsl-hd.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0x` | `0X` HexDigit NumericLiteralSeparator HexDigit
+info: |
+  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
+
+---*/
+
+assert.sameValue(0x0_1, 0x01);
+assert.sameValue(0X0_1, 0X01);

test/language/literals/numeric/numeric-separator-literal-hil-hd-nsl-hds.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0x` | `0X` HexDigit NumericLiteralSeparator HexDigit
+info: |
+  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
+
+---*/
+
+assert.sameValue(0x0_10, 0x010);
+assert.sameValue(0X0_10, 0X010);

test/language/literals/numeric/numeric-separator-literal-hil-hds-nsl-hd.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0x` | `0X` HexDigits NumericLiteralSeparator HexDigit
+info: |
+  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
+
+---*/
+
+assert.sameValue(0x01_0, 0x010);
+assert.sameValue(0X01_0, 0X010);

test/language/literals/numeric/numeric-separator-literal-hil-hds-nsl-hds.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0x` | `0X` HexDigits NumericLiteralSeparator HexDigit
+info: |
+  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
+
+---*/
+
+assert.sameValue(0x01_00, 0x0100);
+assert.sameValue(0X01_00, 0X0100);

test/language/literals/numeric/numeric-separator-literal-hil-nsl-hd-dunder-err.js

@@ -0,0 +1,32 @@
+// 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 appear adjacent to another
+  NumericLiteralSeparator in a HexIntegerLiteral
+info: |
+  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: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0x0__0

test/language/literals/numeric/numeric-separator-literal-hil-nsl-hd-err.js

@@ -0,0 +1,32 @@
+// 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
+  HexIntegerLiteral
+info: |
+  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: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0x0_

test/language/literals/numeric/numeric-separator-literal-hil-od-nsl-od-one-of.js

@@ -0,0 +1,47 @@
+// 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: >
+  `0x` | `0X` HexDigit NumericLiteralSeparator HexDigit
+info: |
+  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
+
+---*/
+
+assert.sameValue(0x0_0, 0x00);
+assert.sameValue(0x1_1, 0x11);
+assert.sameValue(0x2_2, 0x22);
+assert.sameValue(0x3_3, 0x33);
+assert.sameValue(0x4_4, 0x44);
+assert.sameValue(0x5_5, 0x55);
+assert.sameValue(0x6_6, 0x66);
+assert.sameValue(0x7_7, 0x77);
+assert.sameValue(0x8_8, 0x88);
+assert.sameValue(0x9_9, 0x99);
+assert.sameValue(0xa_a, 0xaa);
+assert.sameValue(0xb_b, 0xbb);
+assert.sameValue(0xc_c, 0xcc);
+assert.sameValue(0xd_d, 0xdd);
+assert.sameValue(0xe_e, 0xee);
+assert.sameValue(0xf_f, 0xff);
+assert.sameValue(0xA_A, 0xAA);
+assert.sameValue(0xB_B, 0xBB);
+assert.sameValue(0xC_C, 0xCC);
+assert.sameValue(0xD_D, 0xDD);
+assert.sameValue(0xE_E, 0xEE);
+assert.sameValue(0xF_F, 0xFF);

test/language/literals/numeric/numeric-separator-literal-nzd-nsl-dd-one-of.js

@@ -0,0 +1,38 @@
+// 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: NonZeroDigit NumericLiteralSeparator DecimalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+  NonZeroDigit :: one of
+    1 2 3 4 5 6 7 8 9
+
+  DecimalDigits ::
+    DecimalDigit
+    ...
+
+  DecimalDigit :: one of
+    0 1 2 3 4 5 6 7 8 9
+
+---*/
+
+assert.sameValue(1_0, 10);
+assert.sameValue(1_1, 11);
+assert.sameValue(2_2, 22);
+assert.sameValue(3_3, 33);
+assert.sameValue(4_4, 44);
+assert.sameValue(5_5, 55);
+assert.sameValue(6_6, 66);
+assert.sameValue(7_7, 77);
+assert.sameValue(8_8, 88);
+assert.sameValue(9_9, 99);
+
+

test/language/literals/numeric/numeric-separator-literal-nzd-nsl-dd.js

@@ -0,0 +1,25 @@
+// 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: NonZeroDigit NumericLiteralSeparator DecimalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+  NonZeroDigit :: one of
+    1 2 3 4 5 6 7 8 9
+
+  DecimalDigits ::
+    ...
+    DecimalDigits DecimalDigit
+    ...
+
+---*/
+
+assert.sameValue(1_1, 11);

test/language/literals/numeric/numeric-separator-literal-nzd-nsl-dds-dunder-err.js

@@ -0,0 +1,27 @@
+// 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 appear adjacent to another
+  NumericLiteralSeparator in DecimalIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+  NonZeroDigit :: one of
+    1 2 3 4 5 6 7 8 9
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0__0123456789

test/language/literals/numeric/numeric-separator-literal-nzd-nsl-dds-leading-zero-err.js

@@ -0,0 +1,25 @@
+// 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: NonZeroDigit NumericLiteralSeparator DecimalDigits
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator DecimalDigits
+
+  NonZeroDigit :: one of
+    1 2 3 4 5 6 7 8 9
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0_0123456789

test/language/literals/numeric/numeric-separator-literal-nzd-nsl-dds.js

@@ -0,0 +1,25 @@
+// 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: NonZeroDigit NumericLiteralSeparator DecimalDigits
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  DecimalIntegerLiteral ::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+  NonZeroDigit :: one of
+    1 2 3 4 5 6 7 8 9
+
+  DecimalDigits ::
+    ...
+    DecimalDigits DecimalDigit
+    ...
+
+---*/
+
+assert.sameValue(1_0123456789, 10123456789);

test/language/literals/numeric/numeric-separator-literal-oil-nsl-od-dunder-err.js

@@ -0,0 +1,32 @@
+// 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 appear adjacent to another
+  NumericLiteralSeparator in a OctalIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0o0__0

test/language/literals/numeric/numeric-separator-literal-oil-nsl-od-err.js

@@ -0,0 +1,32 @@
+// 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 an
+  OctalIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0o0_

test/language/literals/numeric/numeric-separator-literal-oil-od-nsl-od-err.js

@@ -0,0 +1,32 @@
+// 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 appear adjacent to `0o` | `0O` in a
+  OctalIntegerLiteral
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+0o_1

test/language/literals/numeric/numeric-separator-literal-oil-od-nsl-od-one-of.js

@@ -0,0 +1,33 @@
+// 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: >
+  `0o` | `0O` OctalDigit NumericLiteralSeparator OctalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+---*/
+
+assert.sameValue(0o0_0, 0o00);
+assert.sameValue(0o1_1, 0o11);
+assert.sameValue(0o2_2, 0o22);
+assert.sameValue(0o3_3, 0o33);
+assert.sameValue(0o4_4, 0o44);
+assert.sameValue(0o5_5, 0o55);
+assert.sameValue(0o6_6, 0o66);
+assert.sameValue(0o7_7, 0o77);

test/language/literals/numeric/numeric-separator-literal-oil-od-nsl-od.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0o` | `0O` OctalDigit NumericLiteralSeparator OctalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+---*/
+
+assert.sameValue(0o0_1, 0o01);
+assert.sameValue(0O0_1, 0O01);

test/language/literals/numeric/numeric-separator-literal-oil-od-nsl-ods.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0o` | `0O` OctalDigit NumericLiteralSeparator OctalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+---*/
+
+assert.sameValue(0o0_10, 0o010);
+assert.sameValue(0O0_10, 0O010);

test/language/literals/numeric/numeric-separator-literal-oil-ods-nsl-od.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0o` | `0O` OctalDigits NumericLiteralSeparator OctalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+---*/
+
+assert.sameValue(0o01_0, 0o010);
+assert.sameValue(0O01_0, 0O010);

test/language/literals/numeric/numeric-separator-literal-oil-ods-nsl-ods.js

@@ -0,0 +1,27 @@
+// 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: >
+  `0o` | `0O` OctalDigits NumericLiteralSeparator OctalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  OctalIntegerLiteral ::
+    0o OctalDigits
+    0O OctalDigits
+
+  OctalDigits ::
+    OctalDigit
+    OctalDigits OctalDigit
+    OctalDigits NumericLiteralSeparator OctalDigit
+
+  OctalDigit :: one of
+    0 1 2 3 4 5 6 7
+
+---*/
+
+assert.sameValue(0o01_00, 0o0100);
+assert.sameValue(0O01_00, 0O0100);

test/language/literals/numeric/numeric-separator-literal-sign-minus-dds-nsl-dd.js

@@ -0,0 +1,26 @@
+// 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: DecimalDigits NumericLiteralSeparator DecimalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  SignedInteger ::
+    ...
+    - DecimalDigits
+
+---*/
+
+assert.sameValue(-123456789_0, -1234567890);
+assert.sameValue(-123456789_1, -1234567891);
+assert.sameValue(-123456789_2, -1234567892);
+assert.sameValue(-123456789_3, -1234567893);
+assert.sameValue(-123456789_4, -1234567894);
+assert.sameValue(-123456789_5, -1234567895);
+assert.sameValue(-123456789_6, -1234567896);
+assert.sameValue(-123456789_7, -1234567897);
+assert.sameValue(-123456789_8, -1234567898);
+assert.sameValue(-123456789_9, -1234567899);

test/language/literals/numeric/numeric-separator-literal-sign-plus-dds-nsl-dd.js

@@ -0,0 +1,27 @@
+// 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: DecimalDigits NumericLiteralSeparator DecimalDigit
+info: |
+  NumericLiteralSeparator ::
+    _
+
+  SignedInteger ::
+    ...
+    + DecimalDigits
+    ...
+
+---*/
+
+assert.sameValue(+123456789_0, 1234567890);
+assert.sameValue(+123456789_1, 1234567891);
+assert.sameValue(+123456789_2, 1234567892);
+assert.sameValue(+123456789_3, 1234567893);
+assert.sameValue(+123456789_4, 1234567894);
+assert.sameValue(+123456789_5, 1234567895);
+assert.sameValue(+123456789_6, 1234567896);
+assert.sameValue(+123456789_7, 1234567897);
+assert.sameValue(+123456789_8, 1234567898);
+assert.sameValue(+123456789_9, 1234567899);

test/language/literals/numeric/numeric-separator-literal-unicode-err.js

@@ -0,0 +1,24 @@
+// 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: >
+  NonZeroDigit NumericLiteralSeparator DecimalDigits sequence expressed with
+  unicode escape sequence
+info: |
+  NumericLiteralSeparator::
+    _
+
+  DecimalIntegerLiteral::
+    ...
+    NonZeroDigit NumericLiteralSeparator_opt DecimalDigits
+
+negative:
+  phase: early
+  type: SyntaxError
+---*/
+
+throw "Test262: This statement should not be evaluated.";
+
+1\u005F0123456789