From 82955482de3c8c8d54248131710c0497d4ae4168 Mon Sep 17 00:00:00 2001
From: test262-automation <test262-automation@bocoup.com>
Date: Wed, 17 Oct 2018 18:44:44 +0000
Subject: [PATCH] [v8-test262-automation] Changes from
 https://github.com/v8/v8.git at sha d34cbcd7 on Wed Oct 17 2018 18:44:12
 GMT+0000 (Coordinated Universal Time)

---
 .../v8/intl/intl.status                       | 23 ++++++
 .../v8/intl/list-format/constructor.js        | 13 ++--
 .../v8/intl/list-format/format-en.js          | 35 ++-------
 .../v8/intl/list-format/format-to-parts.js    | 16 ++--
 .../v8/intl/list-format/format.js             |  9 ++-
 .../v8/intl/list-format/resolved-options.js   | 38 +++++-----
 .../segmenter/segment-grapheme-following.js   | 38 ++++++++++
 .../segmenter/segment-grapheme-iterable.js    | 45 +++++++++++
 .../intl/segmenter/segment-grapheme-next.js   | 36 +++++++++
 .../segmenter/segment-grapheme-preceding.js   | 44 +++++++++++
 .../v8/intl/segmenter/segment-grapheme.js     | 29 +++++++
 .../segmenter/segment-iterator-breakType.js   | 11 +++
 .../segmenter/segment-iterator-position.js    | 11 +++
 .../v8/intl/segmenter/segment-iterator.js     | 17 +++--
 .../segmenter/segment-line-following-modes.js | 57 ++++++++++++++
 .../intl/segmenter/segment-line-following.js  | 38 ++++++++++
 .../intl/segmenter/segment-line-iterable.js   | 45 +++++++++++
 .../v8/intl/segmenter/segment-line-next.js    | 36 +++++++++
 .../intl/segmenter/segment-line-preceding.js  | 44 +++++++++++
 .../v8/intl/segmenter/segment-line.js         | 29 +++++++
 .../segmenter/segment-sentence-following.js   | 38 ++++++++++
 .../segmenter/segment-sentence-iterable.js    | 45 +++++++++++
 .../intl/segmenter/segment-sentence-next.js   | 36 +++++++++
 .../segmenter/segment-sentence-preceding.js   | 44 +++++++++++
 .../v8/intl/segmenter/segment-sentence.js     | 29 +++++++
 .../intl/segmenter/segment-word-following.js  | 38 ++++++++++
 .../intl/segmenter/segment-word-iterable.js   | 45 +++++++++++
 .../v8/intl/segmenter/segment-word-next.js    | 36 +++++++++
 .../intl/segmenter/segment-word-preceding.js  | 44 +++++++++++
 .../v8/intl/segmenter/supported-locale.js     |  8 +-
 .../mjsunit/array-functions-prototype-misc.js | 14 ----
 .../v8/mjsunit/array-join.js                  | 14 +++-
 .../harmony/public-static-class-fields.js     | 13 ++++
 .../v8/mjsunit/harmony/weakrefs/basics.js     | 76 +++++++++++++++++++
 .../harmony/weakrefs/iterating-weak-cells.js  |  8 +-
 35 files changed, 1013 insertions(+), 89 deletions(-)
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-grapheme-following.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-grapheme-iterable.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-grapheme-next.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-grapheme-preceding.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-grapheme.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-iterator-breakType.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-iterator-position.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-line-following-modes.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-line-following.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-line-iterable.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-line-next.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-line-preceding.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-line.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-sentence-following.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-sentence-iterable.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-sentence-next.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-sentence-preceding.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-sentence.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-word-following.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-word-iterable.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-word-next.js
 create mode 100644 implementation-contributed/v8/intl/segmenter/segment-word-preceding.js

diff --git a/implementation-contributed/v8/intl/intl.status b/implementation-contributed/v8/intl/intl.status
index 42807597a0..799c627c1b 100644
--- a/implementation-contributed/v8/intl/intl.status
+++ b/implementation-contributed/v8/intl/intl.status
@@ -32,10 +32,33 @@
 
   # https://bugs.chromium.org/p/v8/issues/detail?id=6891
   'segmenter/segment': [FAIL],
+  'segmenter/segment-grapheme': [FAIL],
+  'segmenter/segment-grapheme-following': [FAIL],
+  'segmenter/segment-grapheme-iterable': [FAIL],
+  'segmenter/segment-grapheme-next': [FAIL],
+  'segmenter/segment-grapheme-preceding': [FAIL],
   'segmenter/segment-iterator': [FAIL],
+  'segmenter/segment-iterator-breakType': [FAIL],
   'segmenter/segment-iterator-following': [FAIL],
   'segmenter/segment-iterator-next': [FAIL],
+  'segmenter/segment-iterator-position': [FAIL],
   'segmenter/segment-iterator-preceding': [FAIL],
+  'segmenter/segment-line': [FAIL],
+  'segmenter/segment-line-following': [FAIL],
+  'segmenter/segment-line-following-modes': [FAIL],
+  'segmenter/segment-line-iterable': [FAIL],
+  'segmenter/segment-line-next': [FAIL],
+  'segmenter/segment-line-preceding': [FAIL],
+  'segmenter/segment-sentence': [FAIL],
+  'segmenter/segment-sentence-following': [FAIL],
+  'segmenter/segment-sentence-iterable': [FAIL],
+  'segmenter/segment-sentence-next': [FAIL],
+  'segmenter/segment-sentence-preceding': [FAIL],
+  'segmenter/segment-word': [FAIL],
+  'segmenter/segment-word-following': [FAIL],
+  'segmenter/segment-word-iterable': [FAIL],
+  'segmenter/segment-word-next': [FAIL],
+  'segmenter/segment-word-preceding': [FAIL],
 }],  # ALWAYS
 
 ['variant == no_wasm_traps', {
diff --git a/implementation-contributed/v8/intl/list-format/constructor.js b/implementation-contributed/v8/intl/list-format/constructor.js
index 33a85fd79f..2ef2c5088b 100644
--- a/implementation-contributed/v8/intl/list-format/constructor.js
+++ b/implementation-contributed/v8/intl/list-format/constructor.js
@@ -54,8 +54,7 @@ assertDoesNotThrow(
 assertDoesNotThrow(
     () => new Intl.ListFormat(['sr'], {style: 'short'}));
 
-assertDoesNotThrow(
-    () => new Intl.ListFormat(['sr'], {style: 'narrow'}));
+assertThrows(() => new Intl.ListFormat(['sr'], {style: 'narrow'}), RangeError);
 
 assertThrows(
     () => new Intl.ListFormat(['sr'], {style: 'giant'}),
@@ -67,8 +66,9 @@ assertDoesNotThrow(
 assertDoesNotThrow(
     () => new Intl.ListFormat(['sr'], {type: 'conjunction', style: 'short'}));
 
-assertDoesNotThrow(
-    () => new Intl.ListFormat(['sr'], {type: 'conjunction', style: 'narrow'}));
+assertThrows(
+    () => new Intl.ListFormat(['sr'], {type: 'conjunction', style: 'narrow'}),
+    RangeError);
 
 assertDoesNotThrow(
     () => new Intl.ListFormat(['sr'], {type: 'disjunction', style: 'long'}));
@@ -76,8 +76,9 @@ assertDoesNotThrow(
 assertDoesNotThrow(
     () => new Intl.ListFormat(['sr'], {type: 'disjunction', style: 'short'}));
 
-assertDoesNotThrow(
-    () => new Intl.ListFormat(['sr'], {type: 'disjunction', style: 'narrow'}));
+assertThrows(
+    () => new Intl.ListFormat(['sr'], {type: 'disjunction', style: 'narrow'}),
+    RangeError);
 
 assertDoesNotThrow(
     () => new Intl.ListFormat(['sr'], {type: 'unit', style: 'long'}));
diff --git a/implementation-contributed/v8/intl/list-format/format-en.js b/implementation-contributed/v8/intl/list-format/format-en.js
index 21eb99d06d..d628537990 100644
--- a/implementation-contributed/v8/intl/list-format/format-en.js
+++ b/implementation-contributed/v8/intl/list-format/format-en.js
@@ -14,13 +14,14 @@ let enLongConjunction = new Intl.ListFormat(
     ["en"], {style: "long", type: 'conjunction'});
 
 assertEquals('', enLongConjunction.format());
- assertEquals('', enLongConjunction.format([]));
+assertEquals('', enLongConjunction.format([]));
 assertEquals('a', enLongConjunction.format(['a']));
 assertEquals('b', enLongConjunction.format(['b']));
 assertEquals('a and b', enLongConjunction.format(['a', 'b']));
 assertEquals('a, b, and c', enLongConjunction.format(['a', 'b', 'c']));
 assertEquals('a, b, c, and d', enLongConjunction.format(['a', 'b', 'c', 'd']));
-assertEquals('a, b, c, d, and and', enLongConjunction.format(['a', 'b', 'c', 'd', 'and']));
+assertEquals('a, b, c, d, and and',
+    enLongConjunction.format(['a', 'b', 'c', 'd', 'and']));
 
 let enLongDisjunction = new Intl.ListFormat(
     ["en"], {style: "long", type: 'disjunction'});
@@ -32,7 +33,8 @@ assertEquals('b', enLongDisjunction.format(['b']));
 assertEquals('a or b', enLongDisjunction.format(['a', 'b']));
 assertEquals('a, b, or c', enLongDisjunction.format(['a', 'b', 'c']));
 assertEquals('a, b, c, or d', enLongDisjunction.format(['a', 'b', 'c', 'd']));
-assertEquals('a, b, c, d, or or', enLongDisjunction.format(['a', 'b', 'c', 'd', 'or']));
+assertEquals('a, b, c, d, or or',
+    enLongDisjunction.format(['a', 'b', 'c', 'd', 'or']));
 
 let enLongUnit = new Intl.ListFormat(
     ["en"], {style: "long", type: 'unit'});
@@ -56,7 +58,8 @@ assertEquals('b', enShortConjunction.format(['b']));
 assertEquals('a and b', enShortConjunction.format(['a', 'b']));
 assertEquals('a, b, and c', enShortConjunction.format(['a', 'b', 'c']));
 assertEquals('a, b, c, and d', enShortConjunction.format(['a', 'b', 'c', 'd']));
-assertEquals('a, b, c, d, and and', enShortConjunction.format(['a', 'b', 'c', 'd', 'and']));
+assertEquals('a, b, c, d, and and',
+   enShortConjunction.format(['a', 'b', 'c', 'd', 'and']));
 
 let enShortDisjunction = new Intl.ListFormat(
     ["en"], {style: "short", type: 'disjunction'});
@@ -82,30 +85,6 @@ assertEquals('a, b, c', enShortUnit.format(['a', 'b', 'c']));
 assertEquals('a, b, c, d', enShortUnit.format(['a', 'b', 'c', 'd']));
 assertEquals('a, b, c, d, or', enShortUnit.format(['a', 'b', 'c', 'd', 'or']));
 
-let enNarrowConjunction = new Intl.ListFormat(
-    ["en"], {style: "narrow", type: 'conjunction'});
-
-assertEquals('', enNarrowConjunction.format());
-assertEquals('', enNarrowConjunction.format([]));
-assertEquals('a', enNarrowConjunction.format(['a']));
-assertEquals('b', enNarrowConjunction.format(['b']));
-assertEquals('a and b', enNarrowConjunction.format(['a', 'b']));
-assertEquals('a, b, and c', enNarrowConjunction.format(['a', 'b', 'c']));
-assertEquals('a, b, c, and d', enNarrowConjunction.format(['a', 'b', 'c', 'd']));
-assertEquals('a, b, c, d, and and', enNarrowConjunction.format(['a', 'b', 'c', 'd', 'and']));
-
-let enNarrowDisjunction = new Intl.ListFormat(
-    ["en"], {style: "narrow", type: 'disjunction'});
-
-assertEquals('', enNarrowDisjunction.format());
-assertEquals('', enNarrowDisjunction.format([]));
-assertEquals('a', enNarrowDisjunction.format(['a']));
-assertEquals('b', enNarrowDisjunction.format(['b']));
-assertEquals('a or b', enNarrowDisjunction.format(['a', 'b']));
-assertEquals('a, b, or c', enNarrowDisjunction.format(['a', 'b', 'c']));
-assertEquals('a, b, c, or d', enNarrowDisjunction.format(['a', 'b', 'c', 'd']));
-assertEquals('a, b, c, d, or or', enNarrowDisjunction.format(['a', 'b', 'c', 'd', 'or']));
-
 let enNarrowUnit = new Intl.ListFormat(
     ["en"], {style: "narrow", type: 'unit'});
 
diff --git a/implementation-contributed/v8/intl/list-format/format-to-parts.js b/implementation-contributed/v8/intl/list-format/format-to-parts.js
index 83473b6d0b..64eac823ba 100644
--- a/implementation-contributed/v8/intl/list-format/format-to-parts.js
+++ b/implementation-contributed/v8/intl/list-format/format-to-parts.js
@@ -77,16 +77,22 @@ testFormatter(new Intl.ListFormat());
 testFormatter(new Intl.ListFormat(["en"]));
 testFormatter(new Intl.ListFormat(["en"], {style: 'long'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'short'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'narrow'}));
+assertThrows(() => new Intl.ListFormat(["en"], {style: 'narrow'}), RangeError);
 testFormatter(new Intl.ListFormat(["en"], {type: 'conjunction'}));
 testFormatter(new Intl.ListFormat(["en"], {type: 'disjunction'}));
 testFormatter(new Intl.ListFormat(["en"], {type: 'unit'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'long', type: 'conjunction'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'short', type: 'conjunction'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'narrow', type: 'conjunction'}));
+testFormatter(
+    new Intl.ListFormat(["en"], {style: 'short', type: 'conjunction'}));
+assertThrows(
+    () => new Intl.ListFormat(
+        ["en"], {style: 'narrow', type: 'conjunction'}), RangeError);
 testFormatter(new Intl.ListFormat(["en"], {style: 'long', type: 'disjunction'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'short', type: 'disjunction'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'narrow', type: 'disjunction'}));
+testFormatter(
+    new Intl.ListFormat(["en"], {style: 'short', type: 'disjunction'}));
+assertThrows(
+    () => new Intl.ListFormat(
+        ["en"], {style: 'narrow', type: 'disjunction'}), RangeError);
 testFormatter(new Intl.ListFormat(["en"], {style: 'long', type: 'unit'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'short', type: 'unit'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'narrow', type: 'unit'}));
diff --git a/implementation-contributed/v8/intl/list-format/format.js b/implementation-contributed/v8/intl/list-format/format.js
index 677cb22496..fef05c38e0 100644
--- a/implementation-contributed/v8/intl/list-format/format.js
+++ b/implementation-contributed/v8/intl/list-format/format.js
@@ -48,16 +48,19 @@ testFormatter(new Intl.ListFormat());
 testFormatter(new Intl.ListFormat(["en"]));
 testFormatter(new Intl.ListFormat(["en"], {style: 'long'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'short'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'narrow'}));
+assertThrows(() => new Intl.ListFormat(
+    ["en"], {style: 'narrow'}), RangeError);
 testFormatter(new Intl.ListFormat(["en"], {type: 'conjunction'}));
 testFormatter(new Intl.ListFormat(["en"], {type: 'disjunction'}));
 testFormatter(new Intl.ListFormat(["en"], {type: 'unit'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'long', type: 'conjunction'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'short', type: 'conjunction'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'narrow', type: 'conjunction'}));
+assertThrows(() => new Intl.ListFormat(
+    ["en"], {style: 'narrow', type: 'conjunction'}), RangeError);
 testFormatter(new Intl.ListFormat(["en"], {style: 'long', type: 'disjunction'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'short', type: 'disjunction'}));
-testFormatter(new Intl.ListFormat(["en"], {style: 'narrow', type: 'disjunction'}));
+assertThrows(() => new Intl.ListFormat(
+    ["en"], {style: 'narrow', type: 'disjunction'}), RangeError);
 testFormatter(new Intl.ListFormat(["en"], {style: 'long', type: 'unit'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'short', type: 'unit'}));
 testFormatter(new Intl.ListFormat(["en"], {style: 'narrow', type: 'unit'}));
diff --git a/implementation-contributed/v8/intl/list-format/resolved-options.js b/implementation-contributed/v8/intl/list-format/resolved-options.js
index 270eb33e45..cca85d2141 100644
--- a/implementation-contributed/v8/intl/list-format/resolved-options.js
+++ b/implementation-contributed/v8/intl/list-format/resolved-options.js
@@ -21,16 +21,6 @@ assertEquals(
     (new Intl.ListFormat(['sr'], {style: 'short'}))
         .resolvedOptions().type);
 
-assertEquals(
-    'narrow',
-    (new Intl.ListFormat(['sr'], {style: 'narrow'}))
-        .resolvedOptions().style);
-
-assertEquals(
-    'conjunction',
-    (new Intl.ListFormat(['sr'], {style: 'narrow'}))
-        .resolvedOptions().type);
-
 assertEquals(
     'long',
     (new Intl.ListFormat(['sr'], {style: 'long'}))
@@ -72,33 +62,43 @@ assertEquals(
         .resolvedOptions().style);
 
 assertEquals(
-    'disjunction',
-    (new Intl.ListFormat(['sr'], {style: 'long', type: 'disjunction'}))
+    'conjunction',
+    (new Intl.ListFormat(['sr'], {style: 'long', type: 'conjunction'}))
         .resolvedOptions().type);
 
 assertEquals(
     'long',
-    (new Intl.ListFormat(['sr'], {style: 'long', type: 'disjunction'}))
+    (new Intl.ListFormat(['sr'], {style: 'long', type: 'conjunction'}))
         .resolvedOptions().style);
 
 assertEquals(
-    'disjunction',
-    (new Intl.ListFormat(['sr'], {style: 'short', type: 'disjunction'}))
+    'conjunction',
+    (new Intl.ListFormat(['sr'], {style: 'short', type: 'conjunction'}))
         .resolvedOptions().type);
 
 assertEquals(
     'short',
-    (new Intl.ListFormat(['sr'], {style: 'short', type: 'disjunction'}))
+    (new Intl.ListFormat(['sr'], {style: 'short', type: 'conjunction'}))
         .resolvedOptions().style);
 
 assertEquals(
     'disjunction',
-    (new Intl.ListFormat(['sr'], {style: 'narrow', type: 'disjunction'}))
+    (new Intl.ListFormat(['sr'], {style: 'long', type: 'disjunction'}))
         .resolvedOptions().type);
 
 assertEquals(
-    'narrow',
-    (new Intl.ListFormat(['sr'], {style: 'narrow', type: 'disjunction'}))
+    'long',
+    (new Intl.ListFormat(['sr'], {style: 'long', type: 'disjunction'}))
+        .resolvedOptions().style);
+
+assertEquals(
+    'disjunction',
+    (new Intl.ListFormat(['sr'], {style: 'short', type: 'disjunction'}))
+        .resolvedOptions().type);
+
+assertEquals(
+    'short',
+    (new Intl.ListFormat(['sr'], {style: 'short', type: 'disjunction'}))
         .resolvedOptions().style);
 
 assertEquals(
diff --git a/implementation-contributed/v8/intl/segmenter/segment-grapheme-following.js b/implementation-contributed/v8/intl/segmenter/segment-grapheme-following.js
new file mode 100644
index 0000000000..0a824c0fb3
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-grapheme-following.js
@@ -0,0 +1,38 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "grapheme"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = 0;
+  let segments = [];
+  while (!iter.following()) {
+    assertEquals(undefined, iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position > prev);
+    segments.push(text.substring(prev, iter.position));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-grapheme-iterable.js b/implementation-contributed/v8/intl/segmenter/segment-grapheme-iterable.js
new file mode 100644
index 0000000000..50cf5db57f
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-grapheme-iterable.js
@@ -0,0 +1,45 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "grapheme"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  let segments = [];
+  // Create another %SegmentIterator% to compare with result from the one that
+  // created in the for of loop.
+  let iter = seg.segment(text);
+  let prev = 0;
+  for (const v of seg.segment(text)) {
+    assertEquals(undefined, v.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+
+    // manually advance the iter.
+    assertFalse(iter.following());
+    assertEquals(iter.breakType, v.breakType);
+    assertEquals(text.substring(prev, iter.position), v.segment);
+    prev = iter.position;
+  }
+  assertTrue(iter.following());
+  assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-grapheme-next.js b/implementation-contributed/v8/intl/segmenter/segment-grapheme-next.js
new file mode 100644
index 0000000000..f9adc27c13
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-grapheme-next.js
@@ -0,0 +1,36 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "grapheme"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let segments = [];
+  for (let result = iter.next(); !result.done; result = iter.next()) {
+    const v = result.value;
+    assertEquals(undefined, v.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+  }
+  assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-grapheme-preceding.js b/implementation-contributed/v8/intl/segmenter/segment-grapheme-preceding.js
new file mode 100644
index 0000000000..0031c22d2d
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-grapheme-preceding.js
@@ -0,0 +1,44 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "grapheme"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = text.length;
+  let segments = [];
+  iter.preceding(prev)
+  assertEquals(undefined, iter.breakType)
+  assertTrue(iter.position >= 0);
+  assertTrue(iter.position < prev);
+  segments.push(text.substring(iter.position, prev));
+  prev = iter.position;
+  while (!iter.preceding()) {
+    assertEquals(undefined, iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position < prev);
+    segments.push(text.substring(iter.position, prev));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.reverse().join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-grapheme.js b/implementation-contributed/v8/intl/segmenter/segment-grapheme.js
new file mode 100644
index 0000000000..6b7e6eaf10
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-grapheme.js
@@ -0,0 +1,29 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "grapheme"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  assertEquals(undefined, iter.breakType);
+  assertEquals(0, iter.position);
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-iterator-breakType.js b/implementation-contributed/v8/intl/segmenter/segment-iterator-breakType.js
new file mode 100644
index 0000000000..ea5f523519
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-iterator-breakType.js
@@ -0,0 +1,11 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const segmenter = new Intl.Segmenter();
+const text = "Hello World, Test 123! Foo Bar. How are you?";
+const iter = segmenter.segment(text);
+
+assertEquals(undefined, iter.breakType);
diff --git a/implementation-contributed/v8/intl/segmenter/segment-iterator-position.js b/implementation-contributed/v8/intl/segmenter/segment-iterator-position.js
new file mode 100644
index 0000000000..93c529a53e
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-iterator-position.js
@@ -0,0 +1,11 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const segmenter = new Intl.Segmenter();
+const text = "Hello World, Test 123! Foo Bar. How are you?";
+const iter = segmenter.segment(text);
+
+assertEquals(0, iter.position);
diff --git a/implementation-contributed/v8/intl/segmenter/segment-iterator.js b/implementation-contributed/v8/intl/segmenter/segment-iterator.js
index 0d0c31b405..45cb67ab5a 100644
--- a/implementation-contributed/v8/intl/segmenter/segment-iterator.js
+++ b/implementation-contributed/v8/intl/segmenter/segment-iterator.js
@@ -4,10 +4,17 @@
 
 // Flags: --harmony-intl-segmenter
 
-const segmenter = new Intl.Segmenter();
+let descriptor;
 const text = "Hello World, Test 123! Foo Bar. How are you?";
-const iter = segmenter.segment(text);
+for (const granularity of ["grapheme", "word", "sentence", "line"]) {
+  const segmenter = new Intl.Segmenter("en", { granularity });
+  const iter = segmenter.segment(text);
 
-assertEquals("number", typeof iter.position);
-assertEquals(0, iter.position);
-assertEquals("strig", typeof iter.breakType);
+  assertEquals("number", typeof iter.position);
+  assertEquals(0, iter.position);
+  if (granularity === "grapheme") {
+    assertEquals(undefined, iter.breakType);
+  } else {
+    assertEquals("string", typeof iter.breakType);
+  }
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-line-following-modes.js b/implementation-contributed/v8/intl/segmenter/segment-line-following-modes.js
new file mode 100644
index 0000000000..75e90f3bf4
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-line-following-modes.js
@@ -0,0 +1,57 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+let breakCounts = {};
+for (const locale of ["en", "fr", "ja", "zh", "ko"]) {
+  for (const lineBreakStyle of ["strict", "normal", "loose"]) {
+    const seg = new Intl.Segmenter(
+        [locale], {granularity: "line", lineBreakStyle: lineBreakStyle});
+    let opportunity = 0;
+    for (const text of [
+      // We know the following data caused different line break results between
+      // different modes.
+      // https://www.w3.org/TR/css-text-3/#propdef-line-break
+      // Japanese small kana or the Katakana-Hiragana prolonged sound mark
+      "あぁーぃーあーいーぁーぃー",
+      // hyphens:
+      // ‐ U+2010, – U+2013, 〜 U+301C, ゠ U+30A0
+      "ABC‐DEF–GHI〜JKL゠MNO",
+      // iteration marks:
+      // 々 U+3005, 〻 U+303B, ゝ U+309D, ゞ U+309E, ヽ U+30FD, ヾ U+30FE
+      "あ々あ〻あゝあゞあヽあヾあ",
+      // centered punctuation marks:
+      // ・ U+30FB, ： U+FF1A, ； U+FF1B, ･ U+FF65, ‼ U+203C
+      "ABC・DEF：GHI；JKL･MNO‼PQR",
+      // centered punctuation marks:
+      // ⁇ U+2047, ⁈ U+2048, ⁉ U+2049, ！ U+FF01, ？ U+FF1F
+      "ABC⁇DEF⁈GHI⁉JKL！MNO？PQR",
+      ]) {
+      const iter = seg.segment(text);
+      while (!iter.following()) {
+        opportunity++;
+      }
+    }
+    breakCounts[locale + "-" + lineBreakStyle] = opportunity;
+  }
+}
+// In Japanese
+// Just test the break count in loose mode is greater than normal mode.
+assertTrue(breakCounts["ja-loose"] > breakCounts["ja-normal"]);
+// and test the break count in normal mode is greater than strict mode.
+assertTrue(breakCounts["ja-normal"] > breakCounts["ja-strict"]);
+// In Chinese
+// Just test the break count in loose mode is greater than normal mode.
+assertTrue(breakCounts["zh-loose"] > breakCounts["zh-normal"]);
+// and test the break count in normal mode is greater than strict mode.
+assertTrue(breakCounts["zh-normal"] > breakCounts["zh-strict"]);
+// In English, French and Korean
+assertEquals(breakCounts["en-loose"], breakCounts["en-normal"]);
+assertEquals(breakCounts["fr-loose"], breakCounts["fr-normal"]);
+assertEquals(breakCounts["ko-loose"], breakCounts["ko-normal"]);
+// and test the break count in normal mode is greater than strict mode.
+assertTrue(breakCounts["en-normal"] > breakCounts["en-strict"]);
+assertTrue(breakCounts["fr-normal"] > breakCounts["fr-strict"]);
+assertTrue(breakCounts["ko-normal"] > breakCounts["ko-strict"]);
diff --git a/implementation-contributed/v8/intl/segmenter/segment-line-following.js b/implementation-contributed/v8/intl/segmenter/segment-line-following.js
new file mode 100644
index 0000000000..010f1cf7bb
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-line-following.js
@@ -0,0 +1,38 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "line"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = 0;
+  let segments = [];
+  while (!iter.following()) {
+    assertTrue(["soft", "hard"].includes(iter.breakType), iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position > prev);
+    segments.push(text.substring(prev, iter.position));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-line-iterable.js b/implementation-contributed/v8/intl/segmenter/segment-line-iterable.js
new file mode 100644
index 0000000000..0fb682c37e
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-line-iterable.js
@@ -0,0 +1,45 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "line"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  let segments = [];
+  // Create another %SegmentIterator% to compare with result from the one that
+  // created in the for of loop.
+  let iter = seg.segment(text);
+  let prev = 0;
+  for (const v of seg.segment(text)) {
+    assertTrue(["soft", "hard"].includes(v.breakType), v.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+
+    // manually advance the iter.
+    assertFalse(iter.following());
+    assertEquals(iter.breakType, v.breakType);
+    assertEquals(text.substring(prev, iter.position), v.segment);
+    prev = iter.position;
+  }
+  assertTrue(iter.following());
+  assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-line-next.js b/implementation-contributed/v8/intl/segmenter/segment-line-next.js
new file mode 100644
index 0000000000..ecfb7eca82
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-line-next.js
@@ -0,0 +1,36 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "line"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let segments = [];
+  for (let result = iter.next(); !result.done; result = iter.next()) {
+    const v = result.value;
+    assertTrue(["soft", "hard"].includes(iter.breakType), iter.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+   }
+   assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-line-preceding.js b/implementation-contributed/v8/intl/segmenter/segment-line-preceding.js
new file mode 100644
index 0000000000..3491a21b9b
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-line-preceding.js
@@ -0,0 +1,44 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "line"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = text.length;
+  let segments = [];
+  iter.preceding(prev)
+  assertTrue(["soft", "hard"].includes(iter.breakType), iter.breakType);
+  assertTrue(iter.position >= 0);
+  assertTrue(iter.position < prev);
+  segments.push(text.substring(iter.position, prev));
+  prev = iter.position;
+  while (!iter.preceding()) {
+    assertTrue(["soft", "hard"].includes(iter.breakType), iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position < prev);
+    segments.push(text.substring(iter.position, prev));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.reverse().join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-line.js b/implementation-contributed/v8/intl/segmenter/segment-line.js
new file mode 100644
index 0000000000..cbaa44356f
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-line.js
@@ -0,0 +1,29 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "line"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  assertTrue(["soft", "hard"].includes(iter.breakType), iter.breakType);
+  assertEquals(0, iter.position);
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-sentence-following.js b/implementation-contributed/v8/intl/segmenter/segment-sentence-following.js
new file mode 100644
index 0000000000..4acae8ba3c
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-sentence-following.js
@@ -0,0 +1,38 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "sentence"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = 0;
+  let segments = [];
+  while (!iter.following()) {
+    assertTrue(["sep", "term"].includes(iter.breakType), iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position > prev);
+    segments.push(text.substring(prev, iter.position));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-sentence-iterable.js b/implementation-contributed/v8/intl/segmenter/segment-sentence-iterable.js
new file mode 100644
index 0000000000..6bd3969c2b
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-sentence-iterable.js
@@ -0,0 +1,45 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "sentence"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  let segments = [];
+  // Create another %SegmentIterator% to compare with result from the one that
+  // created in the for of loop.
+  let iter = seg.segment(text);
+  let prev = 0;
+  for (const v of seg.segment(text)) {
+    assertTrue(["sep", "term"].includes(v.breakType), v.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+
+    // manually advance the iter.
+    assertFalse(iter.following());
+    assertEquals(iter.breakType, v.breakType);
+    assertEquals(text.substring(prev, iter.position), v.segment);
+    prev = iter.position;
+  }
+  assertTrue(iter.following());
+  assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-sentence-next.js b/implementation-contributed/v8/intl/segmenter/segment-sentence-next.js
new file mode 100644
index 0000000000..071f00cfdf
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-sentence-next.js
@@ -0,0 +1,36 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "sentence"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let segments = [];
+  for (let result = iter.next(); !result.done; result = iter.next()) {
+    const v = result.value;
+    assertTrue(["sep", "term"].includes(iter.breakType), iter.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+  }
+  assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-sentence-preceding.js b/implementation-contributed/v8/intl/segmenter/segment-sentence-preceding.js
new file mode 100644
index 0000000000..291b315312
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-sentence-preceding.js
@@ -0,0 +1,44 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "sentence"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = text.length;
+  let segments = [];
+  iter.preceding(prev);
+  assertTrue(["sep", "term"].includes(iter.breakType), iter.breakType);
+  assertTrue(iter.position >= 0);
+  assertTrue(iter.position < prev);
+  segments.push(text.substring(iter.position, prev));
+  prev = iter.position;
+  while (!iter.preceding()) {
+    assertTrue(["sep", "term"].includes(iter.breakType), iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position < prev);
+    segments.push(text.substring(iter.position, prev));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.reverse().join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-sentence.js b/implementation-contributed/v8/intl/segmenter/segment-sentence.js
new file mode 100644
index 0000000000..b258d61998
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-sentence.js
@@ -0,0 +1,29 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "sentence"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  assertTrue(["sep", "term"].includes(iter.breakType), iter.breakType);
+  assertEquals(0, iter.position);
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-word-following.js b/implementation-contributed/v8/intl/segmenter/segment-word-following.js
new file mode 100644
index 0000000000..5f2872e581
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-word-following.js
@@ -0,0 +1,38 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "word"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = 0;
+  let segments = [];
+  while (!iter.following()) {
+    assertTrue(["word", "none"].includes(iter.breakType), iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position > prev);
+    segments.push(text.substring(prev, iter.position));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-word-iterable.js b/implementation-contributed/v8/intl/segmenter/segment-word-iterable.js
new file mode 100644
index 0000000000..120f46842d
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-word-iterable.js
@@ -0,0 +1,45 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "word"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  let segments = [];
+  // Create another %SegmentIterator% to compare with result from the one that
+  // created in the for of loop.
+  let iter = seg.segment(text);
+  let prev = 0;
+  for (const v of seg.segment(text)) {
+    assertTrue(["word", "none"].includes(v.breakType), v.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+
+    // manually advance the iter.
+    assertFalse(iter.following());
+    assertEquals(iter.breakType, v.breakType);
+    assertEquals(text.substring(prev, iter.position), v.segment);
+    prev = iter.position;
+  }
+  assertTrue(iter.following());
+  assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-word-next.js b/implementation-contributed/v8/intl/segmenter/segment-word-next.js
new file mode 100644
index 0000000000..a88e9366ef
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-word-next.js
@@ -0,0 +1,36 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "word"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let segments = [];
+  for (let result = iter.next(); !result.done; result = iter.next()) {
+    const v = result.value;
+    assertTrue(["word", "none"].includes(iter.breakType), iter.breakType);
+    assertEquals("string", typeof v.segment);
+    assertTrue(v.segment.length > 0);
+    segments.push(v.segment);
+  }
+  assertEquals(text, segments.join(''));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/segment-word-preceding.js b/implementation-contributed/v8/intl/segmenter/segment-word-preceding.js
new file mode 100644
index 0000000000..fee750f345
--- /dev/null
+++ b/implementation-contributed/v8/intl/segmenter/segment-word-preceding.js
@@ -0,0 +1,44 @@
+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-intl-segmenter
+
+const seg = new Intl.Segmenter([], {granularity: "word"})
+for (const text of [
+    "Hello world!", // English
+    " Hello world! ",  // English with space before/after
+    " Hello world? Foo bar!", // English
+    "Jedovatou mambu objevila žena v zahrádkářské kolonii.", // Czech
+    "Việt Nam: Nhất thể hóa sẽ khác Trung Quốc?",  // Vietnamese
+    "Σοβαρές ενστάσεις Κομισιόν για τον προϋπολογισμό της Ιταλίας", // Greek
+    "Решение Индии о покупке российских С-400 расценили как вызов США",  // Russian
+    "הרופא שהציל נשים והנערה ששועבדה ע",  // Hebrew,
+    "ترامب للملك سلمان: أنا جاد للغاية.. عليك دفع المزيد", // Arabic
+    "भारत की एस 400 मिसाइल के मुकाबले पाक की थाड, जानें कौन कितना ताकतवर",  //  Hindi
+    "ரெட் அலர்ட் எச்சரிக்கை; புதுச்சேரியில் நாளை அரசு விடுமுறை!", // Tamil
+    "'ఉత్తర్వులు అందే వరకు ఓటర్ల తుది జాబితాను వెబ్‌సైట్లో పెట్టవద్దు'", // Telugu
+    "台北》抹黑柯P失敗？朱學恒酸：姚文智氣pupu嗆大老闆", // Chinese
+    "วัดไทรตีระฆังเบาลงช่วงเข้าพรรษา เจ้าอาวาสเผยคนร้องเรียนรับผลกรรมแล้ว",  // Thai
+    "九州北部の一部が暴風域に入りました(日直予報士 2018年10月06日) - 日本気象協会 tenki.jp",  // Japanese
+    "법원 “다스 지분 처분권·수익권 모두 MB가 보유”", // Korean
+    ]) {
+  const iter = seg.segment(text);
+  let prev = text.length;
+  let segments = [];
+  iter.preceding(prev);
+  assertTrue(["word", "none"].includes(iter.breakType), iter.breakType);
+  assertTrue(iter.position >= 0);
+  assertTrue(iter.position < prev);
+  segments.push(text.substring(iter.position, prev));
+  prev = iter.position;
+  while (!iter.preceding()) {
+    assertTrue(["word", "none"].includes(iter.breakType), iter.breakType);
+    assertTrue(iter.position >= 0);
+    assertTrue(iter.position <= text.length);
+    assertTrue(iter.position < prev);
+    segments.push(text.substring(iter.position, prev));
+    prev = iter.position;
+  }
+  assertEquals(text, segments.reverse().join(""));
+}
diff --git a/implementation-contributed/v8/intl/segmenter/supported-locale.js b/implementation-contributed/v8/intl/segmenter/supported-locale.js
index 24825a2759..9197b6a815 100644
--- a/implementation-contributed/v8/intl/segmenter/supported-locale.js
+++ b/implementation-contributed/v8/intl/segmenter/supported-locale.js
@@ -9,14 +9,14 @@ assertEquals(
     "Intl.Segmenter.supportedLocalesOf should be a function"
 );
 
-var undef = Intl.Segmenter.supportedLocalesOf();
+const undef = Intl.Segmenter.supportedLocalesOf();
 assertEquals([], undef);
 
-var empty = Intl.Segmenter.supportedLocalesOf([]);
+const empty = Intl.Segmenter.supportedLocalesOf([]);
 assertEquals([], empty);
 
-var strLocale = Intl.Segmenter.supportedLocalesOf("sr");
+const strLocale = Intl.Segmenter.supportedLocalesOf("sr");
 assertEquals("sr", strLocale[0]);
 
-var multiLocale = ["sr-Thai-RS", "de", "zh-CN"];
+const multiLocale = ["sr-Thai-RS", "de", "zh-CN"];
 assertEquals(multiLocale, Intl.Segmenter.supportedLocalesOf(multiLocale));
diff --git a/implementation-contributed/v8/mjsunit/array-functions-prototype-misc.js b/implementation-contributed/v8/mjsunit/array-functions-prototype-misc.js
index dd95e2d266..0aff0a2304 100644
--- a/implementation-contributed/v8/mjsunit/array-functions-prototype-misc.js
+++ b/implementation-contributed/v8/mjsunit/array-functions-prototype-misc.js
@@ -170,20 +170,6 @@ for (var use_real_arrays = 0; use_real_arrays <= 1; use_real_arrays++) {
       assertEquals("concat", join);
       join = ba.join('');
       assertEquals("catcon", join);
-
-      var sparse = [];
-      sparse[pos + 1000] = 'is ';
-      sparse[pos + 271828] = 'time ';
-      sparse[pos + 31415] = 'the ';
-      sparse[pos + 012260199] = 'all ';
-      sparse[-1] = 'foo';
-      sparse[pos + 22591927] = 'good ';
-      sparse[pos + 1618033] = 'for ';
-      sparse[pos + 91] = ': Now ';
-      sparse[pos + 86720199] = 'men.';
-      sparse.hest = 'fisk';
-
-      assertEquals("baz: Now is the time for all good men.", sparse.join(''));
     }
 
     a = new_function(pos);
diff --git a/implementation-contributed/v8/mjsunit/array-join.js b/implementation-contributed/v8/mjsunit/array-join.js
index 0c949e769a..1d5ab30ebc 100644
--- a/implementation-contributed/v8/mjsunit/array-join.js
+++ b/implementation-contributed/v8/mjsunit/array-join.js
@@ -25,6 +25,17 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+assertSame(',', [null, undefined].join());
+assertSame('1.5,2.5', [1.5, 2.5].join());
+assertSame(',1.5,', [,1.5,,].join());
+
+var obj = {
+  toString() {
+    return 'a';
+  }
+};
+assertSame('1,1.5,a,', [1, 1.5, obj, ,].join());
+
 // Test that array join calls toString on subarrays.
 var a = [[1,2],3,4,[5,6]];
 assertEquals('1,2345,6', a.join(''));
@@ -82,9 +93,6 @@ assertEquals(246244, a.join("oo").length);
 
 a = new Array(Math.pow(2,32) - 1);  // Max length.
 assertEquals("", a.join(""));
-a[123123123] = "o";
-a[1255215215] = "p";
-assertEquals("op", a.join(""));
 
 a = new Array(100001);
 for (var i = 0; i < a.length; i++) a[i] = undefined;
diff --git a/implementation-contributed/v8/mjsunit/harmony/public-static-class-fields.js b/implementation-contributed/v8/mjsunit/harmony/public-static-class-fields.js
index 3de3e2d9d2..0334a87786 100644
--- a/implementation-contributed/v8/mjsunit/harmony/public-static-class-fields.js
+++ b/implementation-contributed/v8/mjsunit/harmony/public-static-class-fields.js
@@ -457,3 +457,16 @@ y()();
 
   assertEquals(1, X.p);
 }
+
+{
+  let p = { z: class { static y = this.name } }
+  assertEquals(p.z.y, 'z');
+
+  let q = { ["z"]: class { static y = this.name } }
+  assertEquals(q.z.y, 'z');
+
+  const C = class {
+    static x = this.name;
+  }
+  assertEquals(C.x, 'C');
+}
diff --git a/implementation-contributed/v8/mjsunit/harmony/weakrefs/basics.js b/implementation-contributed/v8/mjsunit/harmony/weakrefs/basics.js
index 4cd80cff6d..3402bbec2e 100644
--- a/implementation-contributed/v8/mjsunit/harmony/weakrefs/basics.js
+++ b/implementation-contributed/v8/mjsunit/harmony/weakrefs/basics.js
@@ -31,8 +31,84 @@
   assertEquals(wc.toString(), "[object WeakCell]");
   assertNotSame(wc.__proto__, Object.prototype);
   assertSame(wc.__proto__.__proto__, Object.prototype);
+  assertEquals(wc.holdings, undefined);
+  let desc = Object.getOwnPropertyDescriptor(wc.__proto__, "holdings");
+  assertEquals(true, desc.configurable);
+  assertEquals(false, desc.enumerable);
+  assertEquals("function", typeof desc.get);
+  assertEquals(undefined, desc.set);
+})();
+
+(function TestMakeCellWithHoldings() {
+  let wf = new WeakFactory();
+  let obj = {a: 1};
+  let holdings = {b: 2};
+  let wc = wf.makeCell(obj, holdings);
+  assertSame(wc.holdings, holdings);
+})();
+
+(function TestMakeCellWithHoldingsSetHoldings() {
+  let wf = new WeakFactory();
+  let obj = {a: 1};
+  let holdings = {b: 2};
+  let wc = wf.makeCell(obj, holdings);
+  assertSame(wc.holdings, holdings);
+  wc.holdings = 5;
+  assertSame(wc.holdings, holdings);
+})();
+
+(function TestMakeCellWithHoldingsSetHoldingsStrict() {
+  "use strict";
+  let wf = new WeakFactory();
+  let obj = {a: 1};
+  let holdings = {b: 2};
+  let wc = wf.makeCell(obj, holdings);
+  assertSame(wc.holdings, holdings);
+  assertThrows(() => { wc.holdings = 5; }, TypeError);
+  assertSame(wc.holdings, holdings);
+})();
+
+(function TestMakeCellWithNonObject() {
+  let wf = new WeakFactory();
+  let message = "WeakFactory.makeCell: target must be an object";
+  assertThrows(() => wf.makeCell(), TypeError, message);
+  assertThrows(() => wf.makeCell(1), TypeError, message);
+  assertThrows(() => wf.makeCell(false), TypeError, message);
+  assertThrows(() => wf.makeCell("foo"), TypeError, message);
+  assertThrows(() => wf.makeCell(Symbol()), TypeError, message);
+})();
+
+(function TestMakeCellWithProxy() {
+  let handler = {};
+  let obj = {};
+  let proxy = new Proxy(obj, handler);
+  let wf = new WeakFactory();
+  let wc = wf.makeCell(proxy);
+})();
+
+(function TestMakeCellTargetAndHoldingsSameValue() {
+  let wf = new WeakFactory();
+  let obj = {a: 1};
+  // SameValue(target, holdings) not ok
+  assertThrows(() => wf.makeCell(obj, obj), TypeError,
+               "WeakFactory.makeCell: target and holdings must not be same");
+  // target == holdings ok
+  let holdings = {a: 1};
+  let wc = wf.makeCell(obj, holdings);
 })();
 
 (function TestMakeCellWithoutWeakFactory() {
   assertThrows(() => WeakFactory.prototype.makeCell.call({}, {}), TypeError);
+  // Does not throw:
+  let wf = new WeakFactory();
+  WeakFactory.prototype.makeCell.call(wf, {});
+})();
+
+(function TestHoldingsWithoutWeakCell() {
+  let wf = new WeakFactory();
+  let wc = wf.makeCell({});
+  let holdings_getter = Object.getOwnPropertyDescriptor(wc.__proto__, "holdings").get;
+  assertThrows(() => holdings_getter.call({}), TypeError);
+  // Does not throw:
+  holdings_getter.call(wc);
 })();
diff --git a/implementation-contributed/v8/mjsunit/harmony/weakrefs/iterating-weak-cells.js b/implementation-contributed/v8/mjsunit/harmony/weakrefs/iterating-weak-cells.js
index 4761a2840e..3dd10d3ee6 100644
--- a/implementation-contributed/v8/mjsunit/harmony/weakrefs/iterating-weak-cells.js
+++ b/implementation-contributed/v8/mjsunit/harmony/weakrefs/iterating-weak-cells.js
@@ -13,10 +13,14 @@ let cleanup = function(iter) {
   }
   assertEquals(cells.length, 2);
   if (cells[0] == wc1) {
+    assertEquals(cells[0].holdings, 1);
     assertEquals(cells[1], wc2);
+    assertEquals(cells[1].holdings, 2);
   } else {
     assertEquals(cells[0], wc2);
+    assertEquals(cells[0].holdings, 2);
     assertEquals(cells[1], wc1);
+    assertEquals(cells[1].holdings, 1);
   }
   cleanup_called = true;
 }
@@ -24,8 +28,8 @@ let cleanup = function(iter) {
 let wf = new WeakFactory(cleanup);
 let o1 = {};
 let o2 = {};
-let wc1 = wf.makeCell(o1);
-let wc2 = wf.makeCell(o2);
+let wc1 = wf.makeCell(o1, 1);
+let wc2 = wf.makeCell(o2, 2);
 
 gc();
 assertFalse(cleanup_called);
-- 
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