Add assertion messages

12 files changed, 422 insertions, 166 deletions

diff --git a/test/built-ins/RegExp/unicode_identity_escape.js b/test/built-ins/RegExp/unicode_identity_escape.js
index ca32e9031..67be1a0b3 100755
--- a/test/built-ins/RegExp/unicode_identity_escape.js
+++ b/test/built-ins/RegExp/unicode_identity_escape.js
@@ -18,36 +18,36 @@ es6id: 21.1.2
 //   ^ $ \ . * + ? ( ) [ ] { } |
 
 // IdentityEscape in AtomEscape
-assert(/\^/u.test("^"));
-assert(/\$/u.test("$"));
-assert(/\\/u.test("\\"));
-assert(/\./u.test("."));
-assert(/\*/u.test("*"));
-assert(/\+/u.test("+"));
-assert(/\?/u.test("?"));
-assert(/\(/u.test("("));
-assert(/\)/u.test(")"));
-assert(/\[/u.test("["));
-assert(/\]/u.test("]"));
-assert(/\{/u.test("{"));
-assert(/\}/u.test("}"));
-assert(/\|/u.test("|"));
-assert(/\//u.test("/"));
+assert(/\^/u.test("^"), "IdentityEscape in AtomEscape: /\\^/");
+assert(/\$/u.test("$"), "IdentityEscape in AtomEscape: /\\$/");
+assert(/\\/u.test("\\"), "IdentityEscape in AtomEscape: /\\\\/");
+assert(/\./u.test("."), "IdentityEscape in AtomEscape: /\\./");
+assert(/\*/u.test("*"), "IdentityEscape in AtomEscape: /\\*/");
+assert(/\+/u.test("+"), "IdentityEscape in AtomEscape: /\\+/");
+assert(/\?/u.test("?"), "IdentityEscape in AtomEscape: /\\?/");
+assert(/\(/u.test("("), "IdentityEscape in AtomEscape: /\\(/");
+assert(/\)/u.test(")"), "IdentityEscape in AtomEscape: /\\)/");
+assert(/\[/u.test("["), "IdentityEscape in AtomEscape: /\\[/");
+assert(/\]/u.test("]"), "IdentityEscape in AtomEscape: /\\]/");
+assert(/\{/u.test("{"), "IdentityEscape in AtomEscape: /\\{/");
+assert(/\}/u.test("}"), "IdentityEscape in AtomEscape: /\\}/");
+assert(/\|/u.test("|"), "IdentityEscape in AtomEscape: /\\|/");
+assert(/\//u.test("/"), "IdentityEscape in AtomEscape: /\\//");
 
 
 // IdentityEscape in ClassEscape
-assert(/[\^]/u.test("^"));
-assert(/[\$]/u.test("$"));
-assert(/[\\]/u.test("\\"));
-assert(/[\.]/u.test("."));
-assert(/[\*]/u.test("*"));
-assert(/[\+]/u.test("+"));
-assert(/[\?]/u.test("?"));
-assert(/[\(]/u.test("("));
-assert(/[\)]/u.test(")"));
-assert(/[\[]/u.test("["));
-assert(/[\]]/u.test("]"));
-assert(/[\{]/u.test("{"));
-assert(/[\}]/u.test("}"));
-assert(/[\|]/u.test("|"));
-assert(/[\/]/u.test("/"));
+assert(/[\^]/u.test("^"), "IdentityEscape in ClassEscape: /[\\^]/");
+assert(/[\$]/u.test("$"), "IdentityEscape in ClassEscape: /[\\$]/");
+assert(/[\\]/u.test("\\"), "IdentityEscape in ClassEscape: /[\\\\]/");
+assert(/[\.]/u.test("."), "IdentityEscape in ClassEscape: /[\\.]/");
+assert(/[\*]/u.test("*"), "IdentityEscape in ClassEscape: /[\\*]/");
+assert(/[\+]/u.test("+"), "IdentityEscape in ClassEscape: /[\\+]/");
+assert(/[\?]/u.test("?"), "IdentityEscape in ClassEscape: /[\\?]/");
+assert(/[\(]/u.test("("), "IdentityEscape in ClassEscape: /[\\(]/");
+assert(/[\)]/u.test(")"), "IdentityEscape in ClassEscape: /[\\)]/");
+assert(/[\[]/u.test("["), "IdentityEscape in ClassEscape: /[\\[]/");
+assert(/[\]]/u.test("]"), "IdentityEscape in ClassEscape: /[\\]]/");
+assert(/[\{]/u.test("{"), "IdentityEscape in ClassEscape: /[\\{]/");
+assert(/[\}]/u.test("}"), "IdentityEscape in ClassEscape: /[\\}]/");
+assert(/[\|]/u.test("|"), "IdentityEscape in ClassEscape: /[\\|]/");
+assert(/[\/]/u.test("/"), "IdentityEscape in ClassEscape: /[\\/]/");
diff --git a/test/built-ins/RegExp/unicode_restricted_brackets.js b/test/built-ins/RegExp/unicode_restricted_brackets.js
index a58818051..30d245c6f 100755
--- a/test/built-ins/RegExp/unicode_restricted_brackets.js
+++ b/test/built-ins/RegExp/unicode_restricted_brackets.js
@@ -11,9 +11,21 @@ es6id: 21.1.2
 ---*/
 
 // Single parentheses and brackets.
-assert.throws(SyntaxError, function() { RegExp("(", "u"); });
-assert.throws(SyntaxError, function() { RegExp(")", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[", "u"); });
-assert.throws(SyntaxError, function() { RegExp("]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{", "u"); });
-assert.throws(SyntaxError, function() { RegExp("}", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("(", "u");
+}, 'RegExp("(", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp(")", "u");
+}, 'RegExp(")", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[", "u");
+}, 'RegExp("[", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("]", "u");
+}, 'RegExp("]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{", "u");
+}, 'RegExp("{", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("}", "u");
+}, 'RegExp("}", "u"): ');
diff --git a/test/built-ins/RegExp/unicode_restricted_character_class_escape.js b/test/built-ins/RegExp/unicode_restricted_character_class_escape.js
index d2eb4ac82..4dff53927 100755
--- a/test/built-ins/RegExp/unicode_restricted_character_class_escape.js
+++ b/test/built-ins/RegExp/unicode_restricted_character_class_escape.js
@@ -11,27 +11,63 @@ es6id: 21.2.2.15.1
 ---*/
 
 // Leading CharacterClassEscape.
-assert.throws(SyntaxError, function() { RegExp("[\\d-a]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\D-a]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\s-a]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\S-a]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\w-a]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\W-a]", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("[\\d-a]", "u");
+}, 'RegExp("[\\d-a]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\D-a]", "u");
+}, 'RegExp("[\\D-a]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\s-a]", "u");
+}, 'RegExp("[\\s-a]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\S-a]", "u");
+}, 'RegExp("[\\S-a]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\w-a]", "u");
+}, 'RegExp("[\\w-a]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\W-a]", "u");
+}, 'RegExp("[\\W-a]", "u"): ');
 
 
 // Trailing CharacterClassEscape.
-assert.throws(SyntaxError, function() { RegExp("[a-\\d]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[a-\\D]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[a-\\s]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[a-\\S]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[a-\\w]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[a-\\W]", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("[a-\\d]", "u");
+}, 'RegExp("[a-\\d]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[a-\\D]", "u");
+}, 'RegExp("[a-\\D]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[a-\\s]", "u");
+}, 'RegExp("[a-\\s]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[a-\\S]", "u");
+}, 'RegExp("[a-\\S]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[a-\\w]", "u");
+}, 'RegExp("[a-\\w]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[a-\\W]", "u");
+}, 'RegExp("[a-\\W]", "u"): ');
 
 
 // Leading and trailing CharacterClassEscape.
-assert.throws(SyntaxError, function() { RegExp("[\\d-\\d]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\D-\\D]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\s-\\s]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\S-\\S]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\w-\\w]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\W-\\W]", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("[\\d-\\d]", "u");
+}, 'RegExp("[\\d-\\d]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\D-\\D]", "u");
+}, 'RegExp("[\\D-\\D]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\s-\\s]", "u");
+}, 'RegExp("[\\s-\\s]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\S-\\S]", "u");
+}, 'RegExp("[\\S-\\S]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\w-\\w]", "u");
+}, 'RegExp("[\\w-\\w]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\W-\\W]", "u");
+}, 'RegExp("[\\W-\\W]", "u"): ');
diff --git a/test/built-ins/RegExp/unicode_restricted_identity_escape.js b/test/built-ins/RegExp/unicode_restricted_identity_escape.js
index a53656122..b601c0f71 100755
--- a/test/built-ins/RegExp/unicode_restricted_identity_escape.js
+++ b/test/built-ins/RegExp/unicode_restricted_identity_escape.js
@@ -46,7 +46,7 @@ for (var cu = 0x00; cu <= 0x7f; ++cu) {
   if (!isAlphaDigit(s) && !isSyntaxCharacter(s) && s !== "/") {
     assert.throws(SyntaxError, function() {
       RegExp("\\" + s, "u");
-    }, "Invalid IdentityEscape '\\" + s + "'");
+    }, "Invalid IdentityEscape in AtomEscape: '\\" + s + "'");
   }
 }
 
@@ -60,6 +60,6 @@ for (var cu = 0x00; cu <= 0x7f; ++cu) {
   if (!isAlphaDigit(s) && !isSyntaxCharacter(s) && s !== "/" && s !== "-") {
     assert.throws(SyntaxError, function() {
       RegExp("[\\" + s + "]", "u");
-    }, "Invalid IdentityEscape '\\" + s + "'");
+    }, "Invalid IdentityEscape in ClassEscape: '\\" + s + "'");
   }
 }
diff --git a/test/built-ins/RegExp/unicode_restricted_identity_escape_alpha.js b/test/built-ins/RegExp/unicode_restricted_identity_escape_alpha.js
index 34322d791..3b6e53bdb 100755
--- a/test/built-ins/RegExp/unicode_restricted_identity_escape_alpha.js
+++ b/test/built-ins/RegExp/unicode_restricted_identity_escape_alpha.js
@@ -68,7 +68,7 @@ for (var cu = 0x41 /* A */; cu <= 0x5a /* Z */; ++cu) {
   if (!isValidAlphaEscapeInAtom(s)) {
     assert.throws(SyntaxError, function() {
       RegExp("\\" + s, "u");
-    }, "IdentityEscape '" + s + "'");
+    }, "IdentityEscape in AtomEscape: '" + s + "'");
   }
 }
 for (var cu = 0x61 /* a */; cu <= 0x7a /* z */; ++cu) {
@@ -76,7 +76,7 @@ for (var cu = 0x61 /* a */; cu <= 0x7a /* z */; ++cu) {
   if (!isValidAlphaEscapeInAtom(s)) {
     assert.throws(SyntaxError, function() {
       RegExp("\\" + s, "u");
-    }, "IdentityEscape '" + s + "'");
+    }, "IdentityEscape in AtomEscape: '" + s + "'");
   }
 }
 
@@ -87,7 +87,7 @@ for (var cu = 0x41 /* A */; cu <= 0x5a /* Z */; ++cu) {
   if (!isValidAlphaEscapeInClass(s)) {
     assert.throws(SyntaxError, function() {
       RegExp("[\\" + s + "]", "u");
-    }, "IdentityEscape '" + s + "'");
+    }, "IdentityEscape in ClassEscape: '" + s + "'");
   }
 }
 for (var cu = 0x61 /* a */; cu <= 0x7a /* z */; ++cu) {
@@ -95,6 +95,6 @@ for (var cu = 0x61 /* a */; cu <= 0x7a /* z */; ++cu) {
   if (!isValidAlphaEscapeInClass(s)) {
     assert.throws(SyntaxError, function() {
       RegExp("[\\" + s + "]", "u");
-    }, "IdentityEscape '" + s + "'");
+    }, "IdentityEscape in ClassEscape: '" + s + "'");
   }
 }
diff --git a/test/built-ins/RegExp/unicode_restricted_identity_escape_c.js b/test/built-ins/RegExp/unicode_restricted_identity_escape_c.js
index 74a9239f8..4849a91c4 100755
--- a/test/built-ins/RegExp/unicode_restricted_identity_escape_c.js
+++ b/test/built-ins/RegExp/unicode_restricted_identity_escape_c.js
@@ -25,7 +25,7 @@ for (var cu = 0x00; cu <= 0x7f; ++cu) {
   if (!isAlpha(s)) {
     assert.throws(SyntaxError, function() {
       RegExp("\\c" + s, "u");
-    }, "ControlLetter '" + s + "'");
+    }, "ControlLetter escape in AtomEscape: '" + s + "'");
   }
 }
 
@@ -40,6 +40,6 @@ for (var cu = 0x00; cu <= 0x7f; ++cu) {
   if (!isAlpha(s)) {
     assert.throws(SyntaxError, function() {
       RegExp("[\\c" + s + "]", "u");
-    }, "ControlLetter '" + s + "'");
+    }, "ControlLetter escape in ClassEscape: '" + s + "'");
   }
 }
diff --git a/test/built-ins/RegExp/unicode_restricted_identity_escape_u.js b/test/built-ins/RegExp/unicode_restricted_identity_escape_u.js
index 4795ab400..701a38721 100755
--- a/test/built-ins/RegExp/unicode_restricted_identity_escape_u.js
+++ b/test/built-ins/RegExp/unicode_restricted_identity_escape_u.js
@@ -14,27 +14,63 @@ es6id: 21.1.2
 //
 // AtomEscape[U] :: CharacterEscape[?U]
 // CharacterEscape[U] :: RegExpUnicodeEscapeSequence[?U]
-assert.throws(SyntaxError, function() { RegExp("\\u", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u1", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u12", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u123", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u{", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u{}", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u{1", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u{12", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\u{123", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("\\u", "u");
+}, 'RegExp("\\u", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u1", "u");
+}, 'RegExp("\\u1", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u12", "u");
+}, 'RegExp("\\u12", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u123", "u");
+}, 'RegExp("\\u123", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u{", "u");
+}, 'RegExp("\\u{", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u{}", "u");
+}, 'RegExp("\\u{}", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u{1", "u");
+}, 'RegExp("\\u{1", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u{12", "u");
+}, 'RegExp("\\u{12", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\u{123", "u");
+}, 'RegExp("\\u{123", "u"): ');
 
 
 // Incomplete RegExpUnicodeEscapeSequence in ClassEscape not parsed as IdentityEscape.
 //
 // ClassEscape[U] :: CharacterEscape[?U]
 // CharacterEscape[U] :: RegExpUnicodeEscapeSequence[?U]
-assert.throws(SyntaxError, function() { RegExp("[\\u]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u1]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u12]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u123]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u{]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u{}]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u{1]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u{12]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\u{123]", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u]", "u");
+}, 'RegExp("[\\u]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u1]", "u");
+}, 'RegExp("[\\u1]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u12]", "u");
+}, 'RegExp("[\\u12]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u123]", "u");
+}, 'RegExp("[\\u123]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u{]", "u");
+}, 'RegExp("[\\u{]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u{}]", "u");
+}, 'RegExp("[\\u{}]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u{1]", "u");
+}, 'RegExp("[\\u{1]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u{12]", "u");
+}, 'RegExp("[\\u{12]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\u{123]", "u");
+}, 'RegExp("[\\u{123]", "u"): ');
diff --git a/test/built-ins/RegExp/unicode_restricted_identity_escape_x.js b/test/built-ins/RegExp/unicode_restricted_identity_escape_x.js
index 1b32ac98c..c02c7f85b 100755
--- a/test/built-ins/RegExp/unicode_restricted_identity_escape_x.js
+++ b/test/built-ins/RegExp/unicode_restricted_identity_escape_x.js
@@ -14,13 +14,21 @@ es6id: 21.1.2
 //
 // AtomEscape[U] :: CharacterEscape[?U]
 // CharacterEscape[U] :: HexEscapeSequence
-assert.throws(SyntaxError, function() { RegExp("\\x", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\x1", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("\\x", "u");
+}, 'RegExp("\\x", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\x1", "u");
+}, 'RegExp("\\x1", "u"): ');
 
 
 // Incomplete HexEscapeSequence in ClassEscape not parsed as IdentityEscape.
 //
 // ClassEscape[U] :: CharacterEscape[?U]
 // CharacterEscape[U] :: HexEscapeSequence
-assert.throws(SyntaxError, function() { RegExp("[\\x]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\x1]", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("[\\x]", "u");
+}, 'RegExp("[\\x]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\x1]", "u");
+}, 'RegExp("[\\x1]", "u"): ');
diff --git a/test/built-ins/RegExp/unicode_restricted_incomple_quantifier.js b/test/built-ins/RegExp/unicode_restricted_incomple_quantifier.js
index a75c3ab3f..93858feda 100755
--- a/test/built-ins/RegExp/unicode_restricted_incomple_quantifier.js
+++ b/test/built-ins/RegExp/unicode_restricted_incomple_quantifier.js
@@ -11,14 +11,30 @@ es6id: 21.1.2
 ---*/
 
 // Incomplete quantifier with atom.
-assert.throws(SyntaxError, function() { RegExp("a{", "u"); });
-assert.throws(SyntaxError, function() { RegExp("a{1", "u"); });
-assert.throws(SyntaxError, function() { RegExp("a{1,", "u"); });
-assert.throws(SyntaxError, function() { RegExp("a{1,2", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("a{", "u");
+}, 'RegExp("a{", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("a{1", "u");
+}, 'RegExp("a{1", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("a{1,", "u");
+}, 'RegExp("a{1,", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("a{1,2", "u");
+}, 'RegExp("a{1,2", "u"): ');
 
 
 // Incomplete quantifier without atom.
-assert.throws(SyntaxError, function() { RegExp("{", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1,", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1,2", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("{", "u");
+}, 'RegExp("{", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1", "u");
+}, 'RegExp("{1", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1,", "u");
+}, 'RegExp("{1,", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1,2", "u");
+}, 'RegExp("{1,2", "u"): ');
diff --git a/test/built-ins/RegExp/unicode_restricted_octal_escape.js b/test/built-ins/RegExp/unicode_restricted_octal_escape.js
index e2b075a24..3e08e7a15 100755
--- a/test/built-ins/RegExp/unicode_restricted_octal_escape.js
+++ b/test/built-ins/RegExp/unicode_restricted_octal_escape.js
@@ -14,59 +14,135 @@ es6id: 21.1.2
 //
 // AtomEscape[U] :: DecimalEscape
 // DecimalEscape :: DecimalIntegerLiteral [lookahead /= DecimalDigit]
-assert.throws(SyntaxError, function() { RegExp("\\1", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\2", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\3", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\4", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\5", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\6", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\7", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\8", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\9", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("\\1", "u");
+}, 'RegExp("\\1", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\2", "u");
+}, 'RegExp("\\2", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\3", "u");
+}, 'RegExp("\\3", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\4", "u");
+}, 'RegExp("\\4", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\5", "u");
+}, 'RegExp("\\5", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\6", "u");
+}, 'RegExp("\\6", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\7", "u");
+}, 'RegExp("\\7", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\8", "u");
+}, 'RegExp("\\8", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\9", "u");
+}, 'RegExp("\\9", "u"): ');
 
 
 // DecimalEscape without leading 0 in ClassEscape.
 //
 // ClassEscape[U] :: DecimalEscape
 // DecimalEscape :: DecimalIntegerLiteral [lookahead /= DecimalDigit]
-assert.throws(SyntaxError, function() { RegExp("[\\1]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\2]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\3]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\4]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\5]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\6]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\7]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\8]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\9]", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("[\\1]", "u");
+}, 'RegExp("[\\1]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\2]", "u");
+}, 'RegExp("[\\2]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\3]", "u");
+}, 'RegExp("[\\3]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\4]", "u");
+}, 'RegExp("[\\4]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\5]", "u");
+}, 'RegExp("[\\5]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\6]", "u");
+}, 'RegExp("[\\6]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\7]", "u");
+}, 'RegExp("[\\7]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\8]", "u");
+}, 'RegExp("[\\8]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\9]", "u");
+}, 'RegExp("[\\9]", "u"): ');
 
 
 // DecimalEscape with leading 0 in AtomEscape.
 //
 // Atom[U] :: DecimalEscape
 // DecimalEscape :: DecimalIntegerLiteral [lookahead /= DecimalDigit]
-assert.throws(SyntaxError, function() { RegExp("\\00", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\01", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\02", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\03", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\04", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\05", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\06", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\07", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\08", "u"); });
-assert.throws(SyntaxError, function() { RegExp("\\09", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("\\00", "u");
+}, 'RegExp("\\00", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\01", "u");
+}, 'RegExp("\\01", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\02", "u");
+}, 'RegExp("\\02", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\03", "u");
+}, 'RegExp("\\03", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\04", "u");
+}, 'RegExp("\\04", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\05", "u");
+}, 'RegExp("\\05", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\06", "u");
+}, 'RegExp("\\06", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\07", "u");
+}, 'RegExp("\\07", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\08", "u");
+}, 'RegExp("\\08", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("\\09", "u");
+}, 'RegExp("\\09", "u"): ');
 
 
 // DecimalEscape with leading 0 in ClassEscape.
 //
 // ClassEscape[U] :: DecimalEscape
 // DecimalEscape :: DecimalIntegerLiteral [lookahead /= DecimalDigit]
-assert.throws(SyntaxError, function() { RegExp("[\\00]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\01]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\02]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\03]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\04]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\05]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\06]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\07]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\08]", "u"); });
-assert.throws(SyntaxError, function() { RegExp("[\\09]", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("[\\00]", "u");
+}, 'RegExp("[\\00]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\01]", "u");
+}, 'RegExp("[\\01]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\02]", "u");
+}, 'RegExp("[\\02]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\03]", "u");
+}, 'RegExp("[\\03]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\04]", "u");
+}, 'RegExp("[\\04]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\05]", "u");
+}, 'RegExp("[\\05]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\06]", "u");
+}, 'RegExp("[\\06]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\07]", "u");
+}, 'RegExp("[\\07]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\08]", "u");
+}, 'RegExp("[\\08]", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("[\\09]", "u");
+}, 'RegExp("[\\09]", "u"): ');
diff --git a/test/built-ins/RegExp/unicode_restricted_quantifiable_assertion.js b/test/built-ins/RegExp/unicode_restricted_quantifiable_assertion.js
index 75530772d..45c281d09 100755
--- a/test/built-ins/RegExp/unicode_restricted_quantifiable_assertion.js
+++ b/test/built-ins/RegExp/unicode_restricted_quantifiable_assertion.js
@@ -11,36 +11,84 @@ es6id: 21.1.2
 ---*/
 
 // Positive lookahead with quantifier.
-assert.throws(SyntaxError, function() { RegExp("(?=.)*", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.)+", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.)?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.){1}", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.){1,}", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.){1,2}", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.)*", "u");
+}, 'RegExp("(?=.)*", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.)+", "u");
+}, 'RegExp("(?=.)+", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.)?", "u");
+}, 'RegExp("(?=.)?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.){1}", "u");
+}, 'RegExp("(?=.){1}", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.){1,}", "u");
+}, 'RegExp("(?=.){1,}", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.){1,2}", "u");
+}, 'RegExp("(?=.){1,2}", "u"): ');
 
 
 // Positive lookahead with reluctant quantifier.
-assert.throws(SyntaxError, function() { RegExp("(?=.)*?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.)+?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.)??", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.){1}?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.){1,}?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?=.){1,2}?", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.)*?", "u");
+}, 'RegExp("(?=.)*?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.)+?", "u");
+}, 'RegExp("(?=.)+?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.)??", "u");
+}, 'RegExp("(?=.)??", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.){1}?", "u");
+}, 'RegExp("(?=.){1}?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.){1,}?", "u");
+}, 'RegExp("(?=.){1,}?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?=.){1,2}?", "u");
+}, 'RegExp("(?=.){1,2}?", "u"): ');
 
 
 // Negative lookahead with quantifier.
-assert.throws(SyntaxError, function() { RegExp("(?!.)*", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.)+", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.)?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.){1}", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.){1,}", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.){1,2}", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.)*", "u");
+}, 'RegExp("(?!.)*", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.)+", "u");
+}, 'RegExp("(?!.)+", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.)?", "u");
+}, 'RegExp("(?!.)?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.){1}", "u");
+}, 'RegExp("(?!.){1}", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.){1,}", "u");
+}, 'RegExp("(?!.){1,}", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.){1,2}", "u");
+}, 'RegExp("(?!.){1,2}", "u"): ');
 
 
 // Negative lookahead with reluctant quantifier.
-assert.throws(SyntaxError, function() { RegExp("(?!.)*?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.)+?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.)??", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.){1}?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.){1,}?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("(?!.){1,2}?", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.)*?", "u");
+}, 'RegExp("(?!.)*?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.)+?", "u");
+}, 'RegExp("(?!.)+?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.)??", "u");
+}, 'RegExp("(?!.)??", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.){1}?", "u");
+}, 'RegExp("(?!.){1}?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.){1,}?", "u");
+}, 'RegExp("(?!.){1,}?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("(?!.){1,2}?", "u");
+}, 'RegExp("(?!.){1,2}?", "u"): ');
diff --git a/test/built-ins/RegExp/unicode_restricted_quantifier_without_atom.js b/test/built-ins/RegExp/unicode_restricted_quantifier_without_atom.js
index 371cc7181..0a584bb91 100755
--- a/test/built-ins/RegExp/unicode_restricted_quantifier_without_atom.js
+++ b/test/built-ins/RegExp/unicode_restricted_quantifier_without_atom.js
@@ -11,18 +11,42 @@ es6id: 21.1.2
 ---*/
 
 // Quantifier without atom.
-assert.throws(SyntaxError, function() { RegExp("*", "u"); });
-assert.throws(SyntaxError, function() { RegExp("+", "u"); });
-assert.throws(SyntaxError, function() { RegExp("?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1}", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1,}", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1,2}", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("*", "u");
+}, 'RegExp("*", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("+", "u");
+}, 'RegExp("+", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("?", "u");
+}, 'RegExp("?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1}", "u");
+}, 'RegExp("{1}", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1,}", "u");
+}, 'RegExp("{1,}", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1,2}", "u");
+}, 'RegExp("{1,2}", "u"): ');
 
 
 // Reluctant quantifier without atom.
-assert.throws(SyntaxError, function() { RegExp("*?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("+?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("??", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1}?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1,}?", "u"); });
-assert.throws(SyntaxError, function() { RegExp("{1,2}?", "u"); });
+assert.throws(SyntaxError, function() {
+  RegExp("*?", "u");
+}, 'RegExp("*?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("+?", "u");
+}, 'RegExp("+?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("??", "u");
+}, 'RegExp("??", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1}?", "u");
+}, 'RegExp("{1}?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1,}?", "u");
+}, 'RegExp("{1,}?", "u"): ');
+assert.throws(SyntaxError, function() {
+  RegExp("{1,2}?", "u");
+}, 'RegExp("{1,2}?", "u"): ');