Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

56 files changed, 1185 insertions, 0 deletions

diff --git a/js/src/tests/test262/language/comments/S7.4_A1_T1.js b/js/src/tests/test262/language/comments/S7.4_A1_T1.js
new file mode 100644
index 0000000000..53e7af07f0
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A1_T1.js
@@ -0,0 +1,36 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Correct interpretation of single line comments
+es5id: 7.4_A1_T1
+description: Create comments with any code
+---*/
+
+//CHECK#1
+// Test262Error.thrower('#1: Correct interpretation single line comments');
+
+//CHECK#2
+var x = 0;
+assert.sameValue(x, 0, 'The value of `x` is 0');
+
+//CHECK#3
+var // y = 1; 
+y;
+assert.sameValue(y, undefined, 'The value of `y` is expected to equal `undefined`');
+
+//CHECK#4
+//Test262Error.thrower('#4: Correct interpretation single line comments') //Test262Error.thrower('#4: Correct interpretation single line comments'); //
+
+////CHECK#5
+//var x = 1;
+//if (x === 1) {
+//  Test262Error.thrower('#5: Correct interpretation single line comments');
+//}
+
+//CHECK#6
+//var this.y = 1; 
+this.y++;
+assert.sameValue(isNaN(y), true, 'isNaN(y) returns true');
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A1_T2.js b/js/src/tests/test262/language/comments/S7.4_A1_T2.js
new file mode 100644
index 0000000000..89a71fa68a
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A1_T2.js
@@ -0,0 +1,13 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Correct interpretation of single line comments
+es5id: 7.4_A1_T2
+description: "Simple test, create empty comment: ///"
+---*/
+
+//CHECK#1
+///
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A2_T1.js b/js/src/tests/test262/language/comments/S7.4_A2_T1.js
new file mode 100644
index 0000000000..123041c021
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A2_T1.js
@@ -0,0 +1,65 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Correct interpretation of multi line comments
+es5id: 7.4_A2_T1
+description: Create comments with any code
+---*/
+
+/*CHECK#1*/
+/* Test262Error.thrower('#1: Correct interpretation multi line comments');
+*/
+
+/*CHECK#2*/
+var x = 0;
+/* x = 1;*/
+assert.sameValue(x, 0, 'The value of `x` is 0');
+
+//CHECK#3
+var /* y = 1;*/
+y;
+assert.sameValue(y, undefined, 'The value of `y` is expected to equal `undefined`');
+
+//CHECK#4
+var /* y = 1;*/ y;
+assert.sameValue(y, undefined, 'The value of `y` is expected to equal `undefined`');
+
+/*CHECK#5*/
+/*var x = 1;
+if (x === 1) {
+  Test262Error.thrower('#5: Correct interpretation multi line comments');
+}
+*/
+
+/*CHECK#6*/
+/*var this.y = 1;*/
+this.y++;
+assert.sameValue(isNaN(y), true, 'isNaN(y) returns true');
+
+//CHECK#7
+var string = "/*var y = 0*/" /* y = 1;*/ 
+assert.sameValue(string, "/*var y = 0*/", 'The value of `string` is "/*var y = 0*/"');
+
+//CHECK#8
+var string = "/*var y = 0" /* y = 1;*/ 
+assert.sameValue(string, "/*var y = 0", 'The value of `string` is "/*var y = 0"');
+
+/*CHECK#9*/
+/** Test262Error.thrower('#9: Correct interpretation multi line comments');
+*/
+
+/*CHECK#10*/
+/* Test262Error.thrower('#10: Correct interpretation multi line comments');
+**/
+
+/*CHECK#11*/
+/****** Test262Error.thrower('#11: Correct interpretation multi line comments');*********
+***********
+*
+
+
+**********
+**/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A2_T2.js b/js/src/tests/test262/language/comments/S7.4_A2_T2.js
new file mode 100644
index 0000000000..9367631d47
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A2_T2.js
@@ -0,0 +1,16 @@
+// |reftest| error:SyntaxError
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Correct interpretation of multi line comments
+es5id: 7.4_A2_T2
+description: Try use /*CHECK#1/. This is not closed multi line comment
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+/*CHECK#1/
diff --git a/js/src/tests/test262/language/comments/S7.4_A3.js b/js/src/tests/test262/language/comments/S7.4_A3.js
new file mode 100644
index 0000000000..1022d4e378
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A3.js
@@ -0,0 +1,23 @@
+// |reftest| error:SyntaxError
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Multi line comments cannot nest
+es5id: 7.4_A3
+description: Try use nested comments
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+/*CHECK#1*/
+
+/*
+var
+
+/* x */
+= 1;
+*/
diff --git a/js/src/tests/test262/language/comments/S7.4_A4_T1.js b/js/src/tests/test262/language/comments/S7.4_A4_T1.js
new file mode 100644
index 0000000000..d7c5f9c404
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A4_T1.js
@@ -0,0 +1,19 @@
+// |reftest| error:SyntaxError
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Single and Multi line comments are used together
+es5id: 7.4_A4_T1
+description: Try use 2 close comment tags
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+/*CHECK#1*/
+
+/* var*/
+x*/
diff --git a/js/src/tests/test262/language/comments/S7.4_A4_T2.js b/js/src/tests/test262/language/comments/S7.4_A4_T2.js
new file mode 100644
index 0000000000..40eab2bd54
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A4_T2.js
@@ -0,0 +1,15 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Single and Multi line comments are used together
+es5id: 7.4_A4_T2
+description: Fist Multi line comment, then Single line comment
+---*/
+
+/*CHECK#1*/
+
+/* var
+*///x*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A4_T3.js b/js/src/tests/test262/language/comments/S7.4_A4_T3.js
new file mode 100644
index 0000000000..d11197915b
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A4_T3.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Single and Multi line comments are used together
+es5id: 7.4_A4_T3
+description: Insert Single line comment into Multi line comment
+---*/
+
+/*CHECK#1*/
+
+/* var
+//x
+*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A4_T4.js b/js/src/tests/test262/language/comments/S7.4_A4_T4.js
new file mode 100644
index 0000000000..4c767e1678
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A4_T4.js
@@ -0,0 +1,19 @@
+// |reftest| error:SyntaxError
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Single and Multi line comments are used together
+es5id: 7.4_A4_T4
+description: Try to open Multi line comment at the end of Single comment
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+/*CHECK#1*/
+
+// var /*
+x*/
diff --git a/js/src/tests/test262/language/comments/S7.4_A4_T5.js b/js/src/tests/test262/language/comments/S7.4_A4_T5.js
new file mode 100644
index 0000000000..0e826c180e
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A4_T5.js
@@ -0,0 +1,14 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Single and Multi line comments are used together
+es5id: 7.4_A4_T5
+description: Insert Multi line comment into Single line comment
+---*/
+
+/*CHECK#1*/
+
+// var /* x */
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A4_T6.js b/js/src/tests/test262/language/comments/S7.4_A4_T6.js
new file mode 100644
index 0000000000..cb76b864ee
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A4_T6.js
@@ -0,0 +1,16 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Single and Multi line comments are used together
+es5id: 7.4_A4_T6
+description: >
+    Insert Multi line comment with two closed tags into Single line
+    comment
+---*/
+
+/*CHECK#1*/
+
+// var /* x / = */ 1 */
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A4_T7.js b/js/src/tests/test262/language/comments/S7.4_A4_T7.js
new file mode 100644
index 0000000000..cec333a3ae
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A4_T7.js
@@ -0,0 +1,17 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: Single and Multi line comments are used together
+es5id: 7.4_A4_T7
+description: Insert Multi line comment into Single line comments
+---*/
+
+/*CHECK#1*/
+
+// var /* 
+// x 
+// =
+// 1*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A5.js b/js/src/tests/test262/language/comments/S7.4_A5.js
new file mode 100644
index 0000000000..933e8e4db8
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A5.js
@@ -0,0 +1,42 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    Single line comments can contain any Unicode character without Line
+    Terminators
+es5id: 7.4_A5
+description: >
+    //var " + xx + "yy = -1", insert instead of xx all Unicode
+    characters
+---*/
+
+var hex = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"];
+for (var i1 = 0; i1 < 16; i1++) {
+  for (var i2 = 0; i2 < 16; i2++) {
+    for (var i3 = 0; i3 < 16; i3++) {
+      for (var i4 = 0; i4 < 16; i4++) {
+        try {
+          var uu = hex[i1] + hex[i2] + hex[i3] + hex[i4];
+          var xx = String.fromCharCode("0x" + uu);
+          var LineTerminators = ((uu === "000A") || (uu === "000D") || (uu === "2028") || (uu === "2029"));
+          var yy = 0;
+          eval("//var " + xx + "yy = -1");
+          if (LineTerminators !== true) {
+            if (yy !== 0) {
+              throw new Test262Error('#' + uu + ' ');
+            }
+          } else {
+            if (yy !== -1) {
+              throw new Test262Error('#' + uu + ' ');
+            }
+          }
+        } catch (e){
+          throw new Test262Error('#' + uu + ' ');
+        }
+      }
+    }
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/S7.4_A6.js b/js/src/tests/test262/language/comments/S7.4_A6.js
new file mode 100644
index 0000000000..e91a6f5710
--- /dev/null
+++ b/js/src/tests/test262/language/comments/S7.4_A6.js
@@ -0,0 +1,26 @@
+// Copyright 2009 the Sputnik authors.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+info: |
+    If multi line comments csn not nest, they can contain any Unicode
+    character
+es5id: 7.4_A6
+description: "\"var\"+ yy+ \"xx = 1\", insert instead of yy all Unicode characters"
+includes: [decimalToHexString.js]
+---*/
+
+for (var indexI = 0; indexI <= 65535; indexI++) {
+  try {
+    var xx = 0;
+    eval("/*var " + String.fromCharCode(indexI) + "xx = 1*/");
+    var differs = xx !== 0;
+  } catch (e){
+    throw new Test262Error('#' + decimalToHexString(indexI) + ' throws');
+  }
+  if (differs) {
+    throw new Test262Error('#' + decimalToHexString(indexI) + ' differs');
+  }
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/browser.js b/js/src/tests/test262/language/comments/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/comments/browser.js
diff --git a/js/src/tests/test262/language/comments/hashbang/browser.js b/js/src/tests/test262/language/comments/hashbang/browser.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/browser.js
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-bang-041.js b/js/src/tests/test262/language/comments/hashbang/escaped-bang-041.js
new file mode 100644
index 0000000000..c232decb83
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-bang-041.js
@@ -0,0 +1,20 @@
+#\041
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \041
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-bang-u0021.js b/js/src/tests/test262/language/comments/hashbang/escaped-bang-u0021.js
new file mode 100644
index 0000000000..52b012bff0
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-bang-u0021.js
@@ -0,0 +1,20 @@
+#\u0021
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \u0021
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-bang-u21.js b/js/src/tests/test262/language/comments/hashbang/escaped-bang-u21.js
new file mode 100644
index 0000000000..75f7e4d5af
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-bang-u21.js
@@ -0,0 +1,20 @@
+#\u{21}
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \u{21}
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-bang-x21.js b/js/src/tests/test262/language/comments/hashbang/escaped-bang-x21.js
new file mode 100644
index 0000000000..f6233833da
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-bang-x21.js
@@ -0,0 +1,20 @@
+#\x21
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \x21
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-hash-043.js b/js/src/tests/test262/language/comments/hashbang/escaped-hash-043.js
new file mode 100644
index 0000000000..0c9e27d0b6
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-hash-043.js
@@ -0,0 +1,20 @@
+\043!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \043
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-hash-u0023.js b/js/src/tests/test262/language/comments/hashbang/escaped-hash-u0023.js
new file mode 100644
index 0000000000..2cb370a63e
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-hash-u0023.js
@@ -0,0 +1,20 @@
+\u0023!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \u0023
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-hash-u23.js b/js/src/tests/test262/language/comments/hashbang/escaped-hash-u23.js
new file mode 100644
index 0000000000..96859b568b
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-hash-u23.js
@@ -0,0 +1,20 @@
+\u{23}!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \u{23}
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-hash-x23.js b/js/src/tests/test262/language/comments/hashbang/escaped-hash-x23.js
new file mode 100644
index 0000000000..82ae6c48c2
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-hash-x23.js
@@ -0,0 +1,20 @@
+\x23!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters \x23
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/escaped-hashbang.js b/js/src/tests/test262/language/comments/hashbang/escaped-hashbang.js
new file mode 100644
index 0000000000..9cfe30afce
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/escaped-hashbang.js
@@ -0,0 +1,20 @@
+\u0023\u0021
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed to have encoded characters
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/eval-indirect.js b/js/src/tests/test262/language/comments/hashbang/eval-indirect.js
new file mode 100644
index 0000000000..2e43a6fd59
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/eval-indirect.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should be available in Script evaluator contexts. (indirect eval)
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+features: [hashbang]
+---*/
+
+assert.sameValue((0, eval)('#!\n'), undefined);
+assert.sameValue((0, eval)('#!\n1'), 1)
+assert.sameValue((0, eval)('#!2\n'), undefined);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/eval.js b/js/src/tests/test262/language/comments/hashbang/eval.js
new file mode 100644
index 0000000000..3d2cc6603a
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/eval.js
@@ -0,0 +1,18 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should be available in Script evaluator contexts. (direct eval)
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+features: [hashbang]
+---*/
+
+assert.sameValue(eval('#!\n'), undefined);
+assert.sameValue(eval('#!\n1'), 1)
+assert.sameValue(eval('#!2\n'), undefined);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/function-body.js b/js/src/tests/test262/language/comments/hashbang/function-body.js
new file mode 100644
index 0000000000..1e2f5f9f63
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/function-body.js
@@ -0,0 +1,21 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at the start of source texts and should not be allowed within function bodies.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+$DONOTEVALUATE();
+
+function fn() {#!
+}
diff --git a/js/src/tests/test262/language/comments/hashbang/function-constructor.js b/js/src/tests/test262/language/comments/hashbang/function-constructor.js
new file mode 100644
index 0000000000..cc75e78e47
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/function-constructor.js
@@ -0,0 +1,29 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be allowed in function evaluator contexts.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+features: [hashbang]
+---*/
+
+const AsyncFunction = (async function (){}).constructor;
+const GeneratorFunction = (function *(){}).constructor;
+const AsyncGeneratorFunction = (async function *(){}).constructor;
+for (const ctor of [
+  Function,
+  AsyncFunction,
+  GeneratorFunction,
+  AsyncGeneratorFunction,
+]) {
+  assert.throws(SyntaxError, () => ctor('#!\n_', ''), `${ctor.name} Call argument`);
+  assert.throws(SyntaxError, () => ctor('#!\n_'), `${ctor.name} Call body`);
+  assert.throws(SyntaxError, () => new ctor('#!\n_', ''), `${ctor.name} Construct argument`);
+  assert.throws(SyntaxError, () => new ctor('#!\n_'), `${ctor.name} Construct body`);
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/line-terminator-carriage-return.js b/js/src/tests/test262/language/comments/hashbang/line-terminator-carriage-return.js
new file mode 100644
index 0000000000..56d66b15d2
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/line-terminator-carriage-return.js
@@ -0,0 +1,30 @@
+#! this comment ends with a Carriage Return (U+000D)
{
+}
+
+// Copyright (C) 2019 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments are terminated by the first LineTerminator: Carriage Return
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+
+    SingleLineCommentChars::
+      SingleLineCommentChar SingleLineCommentChars[opt]
+
+    SingleLineCommentChar::
+      SourceCharacter but not LineTerminator
+
+    LineTerminator::
+      <LF>
+      <CR>
+      <LS>
+      <PS>
+flags: [raw]
+features: [hashbang]
+---*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/line-terminator-line-separator.js b/js/src/tests/test262/language/comments/hashbang/line-terminator-line-separator.js
new file mode 100644
index 0000000000..62829d0f3e
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/line-terminator-line-separator.js
@@ -0,0 +1,30 @@
+#! this comment ends with a Line Separator (U+2028)
{
+}
+
+// Copyright (C) 2019 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments are terminated by the first LineTerminator: Line Separator
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+
+    SingleLineCommentChars::
+      SingleLineCommentChar SingleLineCommentChars[opt]
+
+    SingleLineCommentChar::
+      SourceCharacter but not LineTerminator
+
+    LineTerminator::
+      <LF>
+      <CR>
+      <LS>
+      <PS>
+flags: [raw]
+features: [hashbang]
+---*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/line-terminator-paragraph-separator.js b/js/src/tests/test262/language/comments/hashbang/line-terminator-paragraph-separator.js
new file mode 100644
index 0000000000..1b6e906046
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/line-terminator-paragraph-separator.js
@@ -0,0 +1,30 @@
+#! this comment ends with a Paragraph Separator (U+2029)
{
+}
+
+// Copyright (C) 2019 Mike Pennisi. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments are terminated by the first LineTerminator: Paragraph Separator
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+
+    SingleLineCommentChars::
+      SingleLineCommentChar SingleLineCommentChars[opt]
+
+    SingleLineCommentChar::
+      SourceCharacter but not LineTerminator
+
+    LineTerminator::
+      <LF>
+      <CR>
+      <LS>
+      <PS>
+flags: [raw]
+features: [hashbang]
+---*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/module.js b/js/src/tests/test262/language/comments/hashbang/module.js
new file mode 100644
index 0000000000..d789ef11d4
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/module.js
@@ -0,0 +1,17 @@
+#!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should be allowed in Modules.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [module, raw]
+features: [hashbang]
+---*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/multi-line-comment.js b/js/src/tests/test262/language/comments/hashbang/multi-line-comment.js
new file mode 100644
index 0000000000..c6956b334e
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/multi-line-comment.js
@@ -0,0 +1,21 @@
+#!/*
+throw "Test262: This statement should not be evaluated.";
+these characters should not be considered within a comment
+*/
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not interpret multi-line comments.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
diff --git a/js/src/tests/test262/language/comments/hashbang/no-line-separator.js b/js/src/tests/test262/language/comments/hashbang/no-line-separator.js
new file mode 100644
index 0000000000..6e9c422f61
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/no-line-separator.js
@@ -0,0 +1,16 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not require a newline afterwards
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+features: [hashbang]
+---*/
+
+assert.sameValue(eval('#!'), undefined);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/not-empty.js b/js/src/tests/test262/language/comments/hashbang/not-empty.js
new file mode 100644
index 0000000000..0be0d4bf1a
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/not-empty.js
@@ -0,0 +1,17 @@
+#! these characters should be treated as a comment
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should be allowed in Scripts and should not be required to be empty.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+features: [hashbang]
+---*/
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/hashbang/preceding-directive-prologue-sc.js b/js/src/tests/test262/language/comments/hashbang/preceding-directive-prologue-sc.js
new file mode 100644
index 0000000000..bc010e7212
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/preceding-directive-prologue-sc.js
@@ -0,0 +1,21 @@
+"use strict";
+#!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at start of source texts and should not be preceded by DirectivePrologues.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/preceding-directive-prologue.js b/js/src/tests/test262/language/comments/hashbang/preceding-directive-prologue.js
new file mode 100644
index 0000000000..42cae8422c
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/preceding-directive-prologue.js
@@ -0,0 +1,21 @@
+"use strict"
+#!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at start of source texts and should not be preceded by DirectivePrologues.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/preceding-empty-statement.js b/js/src/tests/test262/language/comments/hashbang/preceding-empty-statement.js
new file mode 100644
index 0000000000..7a66922372
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/preceding-empty-statement.js
@@ -0,0 +1,20 @@
+;#!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at the start of source texts and should not be preceded by empty statements.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/preceding-hashbang.js b/js/src/tests/test262/language/comments/hashbang/preceding-hashbang.js
new file mode 100644
index 0000000000..166457f37c
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/preceding-hashbang.js
@@ -0,0 +1,21 @@
+#!
+#!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at the start of source texts and should not be preceded by Hashbang comments.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/preceding-line-comment.js b/js/src/tests/test262/language/comments/hashbang/preceding-line-comment.js
new file mode 100644
index 0000000000..f30e609487
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/preceding-line-comment.js
@@ -0,0 +1,21 @@
+//
+#!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at the start of source texts and should not be preceded by line comments.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/preceding-multi-line-comment.js b/js/src/tests/test262/language/comments/hashbang/preceding-multi-line-comment.js
new file mode 100644
index 0000000000..f582e29996
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/preceding-multi-line-comment.js
@@ -0,0 +1,21 @@
+/*
+*/#!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at the start of source texts and should not be preceded by multi-line comments.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/preceding-whitespace.js b/js/src/tests/test262/language/comments/hashbang/preceding-whitespace.js
new file mode 100644
index 0000000000..03afd1b872
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/preceding-whitespace.js
@@ -0,0 +1,20 @@
+ #!
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at the start of source texts and should not be preceded by whitespace.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+throw "Test262: This statement should not be evaluated.";
diff --git a/js/src/tests/test262/language/comments/hashbang/shell.js b/js/src/tests/test262/language/comments/hashbang/shell.js
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/shell.js
diff --git a/js/src/tests/test262/language/comments/hashbang/statement-block.js b/js/src/tests/test262/language/comments/hashbang/statement-block.js
new file mode 100644
index 0000000000..3d322fc700
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/statement-block.js
@@ -0,0 +1,22 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should only be allowed at the start of source texts and should not be allowed within blocks.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+negative:
+  phase: parse
+  type: SyntaxError
+features: [hashbang]
+---*/
+
+$DONOTEVALUATE();
+
+{
+  #!
+}
diff --git a/js/src/tests/test262/language/comments/hashbang/use-strict.js b/js/src/tests/test262/language/comments/hashbang/use-strict.js
new file mode 100644
index 0000000000..7c86b066a0
--- /dev/null
+++ b/js/src/tests/test262/language/comments/hashbang/use-strict.js
@@ -0,0 +1,19 @@
+#!"use strict"
+
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: pending
+description: >
+    Hashbang comments should not be interpreted and should not generate DirectivePrologues.
+info: |
+    HashbangComment::
+      #! SingleLineCommentChars[opt]
+flags: [raw]
+features: [hashbang]
+---*/
+
+with ({}) {}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/mongolian-vowel-separator-multi.js b/js/src/tests/test262/language/comments/mongolian-vowel-separator-multi.js
new file mode 100644
index 0000000000..7c2ba00efa
--- /dev/null
+++ b/js/src/tests/test262/language/comments/mongolian-vowel-separator-multi.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2016 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-unicode-format-control-characters
+description: >
+  Mongolian Vowel Separator can appear in multi-line comments.
+info: |
+  11.1 Unicode Format-Control Characters
+
+  The Unicode format-control characters (i.e., the characters in category “Cf”
+  in the Unicode Character Database such as LEFT-TO-RIGHT MARK or RIGHT-TO-LEFT
+  MARK) are control codes used to control the formatting of a range of text in
+  the absence of higher-level protocols for this (such as mark-up languages).
+
+  It is useful to allow format-control characters in source text to facilitate
+  editing and display. All format control characters may be used within comments,
+  and within string literals, template literals, and regular expression literals.
+features: [u180e]
+---*/
+
+// U+180E in comments; UTF8(0x180E) = 0xE1 0xA0 0x8E
+assert.sameValue(
+  0, /*᠎  multi-line comment with U+180E */
+  0
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/mongolian-vowel-separator-single-eval.js b/js/src/tests/test262/language/comments/mongolian-vowel-separator-single-eval.js
new file mode 100644
index 0000000000..e51d44fd6f
--- /dev/null
+++ b/js/src/tests/test262/language/comments/mongolian-vowel-separator-single-eval.js
@@ -0,0 +1,24 @@
+// Copyright (C) 2016 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-unicode-format-control-characters
+description: >
+  Mongolian Vowel Separator can appear in single-line comments (eval code).
+info: |
+  11.1 Unicode Format-Control Characters
+
+  The Unicode format-control characters (i.e., the characters in category “Cf”
+  in the Unicode Character Database such as LEFT-TO-RIGHT MARK or RIGHT-TO-LEFT
+  MARK) are control codes used to control the formatting of a range of text in
+  the absence of higher-level protocols for this (such as mark-up languages).
+
+  It is useful to allow format-control characters in source text to facilitate
+  editing and display. All format control characters may be used within comments,
+  and within string literals, template literals, and regular expression literals.
+features: [u180e]
+---*/
+
+assert.sameValue(eval("0 //\u180E"), 0);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/mongolian-vowel-separator-single.js b/js/src/tests/test262/language/comments/mongolian-vowel-separator-single.js
new file mode 100644
index 0000000000..d367c5846a
--- /dev/null
+++ b/js/src/tests/test262/language/comments/mongolian-vowel-separator-single.js
@@ -0,0 +1,28 @@
+// Copyright (C) 2016 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-unicode-format-control-characters
+description: >
+  Mongolian Vowel Separator can appear in single-line comments.
+info: |
+  11.1 Unicode Format-Control Characters
+
+  The Unicode format-control characters (i.e., the characters in category “Cf”
+  in the Unicode Character Database such as LEFT-TO-RIGHT MARK or RIGHT-TO-LEFT
+  MARK) are control codes used to control the formatting of a range of text in
+  the absence of higher-level protocols for this (such as mark-up languages).
+
+  It is useful to allow format-control characters in source text to facilitate
+  editing and display. All format control characters may be used within comments,
+  and within string literals, template literals, and regular expression literals.
+features: [u180e]
+---*/
+
+// U+180E in comments; UTF8(0x180E) = 0xE1 0xA0 0x8E
+assert.sameValue(
+  0, //᠎  single-line comment with U+180E
+  0
+);
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/multi-line-asi-carriage-return.js b/js/src/tests/test262/language/comments/multi-line-asi-carriage-return.js
new file mode 100644
index 0000000000..b8d35fa410
--- /dev/null
+++ b/js/src/tests/test262/language/comments/multi-line-asi-carriage-return.js
@@ -0,0 +1,19 @@
+// Copyright (c) 2018 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 7.4
+esid: sec-comments
+description: >
+  A multi-line comment containing a carriage return should be considered a
+  LineTerminator
+info: >
+  Comments behave like white space and are discarded except that, if a
+  MultiLineComment contains a line terminator code point, then the entire
+  comment is considered to be a LineTerminator for purposes of parsing by the
+  syntactic grammar.
+---*/
+
+''/*
*/''
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/multi-line-asi-line-feed.js b/js/src/tests/test262/language/comments/multi-line-asi-line-feed.js
new file mode 100644
index 0000000000..af99e055a4
--- /dev/null
+++ b/js/src/tests/test262/language/comments/multi-line-asi-line-feed.js
@@ -0,0 +1,20 @@
+// Copyright (c) 2018 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 7.4
+esid: sec-comments
+description: >
+  A multi-line comment containing a line feed should be considered a
+  LineTerminator
+info: >
+  Comments behave like white space and are discarded except that, if a
+  MultiLineComment contains a line terminator code point, then the entire
+  comment is considered to be a LineTerminator for purposes of parsing by the
+  syntactic grammar.
+---*/
+
+''/*
+*/''
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/multi-line-asi-line-separator.js b/js/src/tests/test262/language/comments/multi-line-asi-line-separator.js
new file mode 100644
index 0000000000..b4f9e98051
--- /dev/null
+++ b/js/src/tests/test262/language/comments/multi-line-asi-line-separator.js
@@ -0,0 +1,19 @@
+// Copyright (c) 2018 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 7.4
+esid: sec-comments
+description: >
+  A multi-line comment containing a line separator should be considered a
+  LineTerminator
+info: >
+  Comments behave like white space and are discarded except that, if a
+  MultiLineComment contains a line terminator code point, then the entire
+  comment is considered to be a LineTerminator for purposes of parsing by the
+  syntactic grammar.
+---*/
+
+''/*
*/''
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/multi-line-asi-paragraph-separator.js b/js/src/tests/test262/language/comments/multi-line-asi-paragraph-separator.js
new file mode 100644
index 0000000000..104a1beb51
--- /dev/null
+++ b/js/src/tests/test262/language/comments/multi-line-asi-paragraph-separator.js
@@ -0,0 +1,19 @@
+// Copyright (c) 2018 Mike Pennisi.  All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es5id: 7.4
+esid: sec-comments
+description: >
+  A multi-line comment containing a paragrah separator should be considered a
+  LineTerminator
+info: >
+  Comments behave like white space and are discarded except that, if a
+  MultiLineComment contains a line terminator code point, then the entire
+  comment is considered to be a LineTerminator for purposes of parsing by the
+  syntactic grammar.
+---*/
+
+''/*
*/''
+
+reportCompare(0, 0);
diff --git a/js/src/tests/test262/language/comments/multi-line-html-close-extra.js b/js/src/tests/test262/language/comments/multi-line-html-close-extra.js
new file mode 100644
index 0000000000..c31542da2b
--- /dev/null
+++ b/js/src/tests/test262/language/comments/multi-line-html-close-extra.js
@@ -0,0 +1,26 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-html-like-comments
+description: >
+    Arbitrary character sequence not permitted before HTMLCloseComment token
+info: |
+    Comment ::
+      MultiLineComment
+      SingleLineComment
+      SingleLineHTMLOpenComment
+      SingleLineHTMLCloseComment
+      SingleLineDelimitedComment
+
+    MultiLineComment ::
+      /* FirstCommentLine[opt] LineTerminator MultiLineCommentChars[opt] * / HTMLCloseComment[opt]
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+/*
+*/ the comment should not include these characters, regardless of AnnexB extensions -->
diff --git a/js/src/tests/test262/language/comments/shell.js b/js/src/tests/test262/language/comments/shell.js
new file mode 100644
index 0000000000..a8ffe3a680
--- /dev/null
+++ b/js/src/tests/test262/language/comments/shell.js
@@ -0,0 +1,28 @@
+// GENERATED, DO NOT EDIT
+// file: decimalToHexString.js
+// Copyright (C) 2017 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+description: |
+    Collection of functions used to assert the correctness of various encoding operations.
+defines: [decimalToHexString, decimalToPercentHexString]
+---*/
+
+function decimalToHexString(n) {
+  var hex = "0123456789ABCDEF";
+  n >>>= 0;
+  var s = "";
+  while (n) {
+    s = hex[n & 0xf] + s;
+    n >>>= 4;
+  }
+  while (s.length < 4) {
+    s = "0" + s;
+  }
+  return s;
+}
+
+function decimalToPercentHexString(n) {
+  var hex = "0123456789ABCDEF";
+  return "%" + hex[(n >> 4) & 0xf] + hex[n & 0xf];
+}
diff --git a/js/src/tests/test262/language/comments/single-line-html-close-without-lt.js b/js/src/tests/test262/language/comments/single-line-html-close-without-lt.js
new file mode 100644
index 0000000000..f8accff32e
--- /dev/null
+++ b/js/src/tests/test262/language/comments/single-line-html-close-without-lt.js
@@ -0,0 +1,24 @@
+// |reftest| error:SyntaxError
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-html-like-comments
+description: An HTMLCloseComment must be preceded by a LineTerminator
+info: |
+    Comment ::
+      MultiLineComment
+      SingleLineComment
+      SingleLineHTMLOpenComment
+      SingleLineHTMLCloseComment
+      SingleLineDelimitedComment
+
+    HTMLCloseComment ::
+      WhiteSpaceSequence[opt] SingleLineDelimitedCommentSequence[opt] --> SingleLineCommentChars[opt]
+negative:
+  phase: parse
+  type: SyntaxError
+---*/
+
+$DONOTEVALUATE();
+
+;-->