From cd6305155b9419d4e1e5caac42fe5820ff82eae9 Mon Sep 17 00:00:00 2001
From: Rick Waldron <waldron.rick@gmail.com>
Date: Wed, 18 Apr 2018 16:56:06 -0400
Subject: [PATCH] BigInt: additional info frontmatter. Validated features
 (#1518)

---
 .../BigInt/asIntN/bigint-tobigint-errors.js   |  2 +-
 .../asIntN/bigint-tobigint-toprimitive.js     |  2 +-
 .../asIntN/bigint-tobigint-wrapped-values.js  |  2 +-
 .../BigInt/asIntN/bits-toindex-errors.js      |  2 +-
 .../BigInt/asIntN/bits-toindex-toprimitive.js |  2 +-
 .../asIntN/bits-toindex-wrapped-values.js     |  2 +-
 .../BigInt/asUintN/bigint-tobigint-errors.js  |  2 +-
 .../asUintN/bigint-tobigint-toprimitive.js    |  2 +-
 .../asUintN/bigint-tobigint-wrapped-values.js |  2 +-
 .../BigInt/asUintN/bits-toindex-errors.js     |  2 +-
 .../asUintN/bits-toindex-toprimitive.js       |  2 +-
 .../asUintN/bits-toindex-wrapped-values.js    |  2 +-
 .../BigInt/constructor-empty-string.js        | 12 +++++++--
 .../BigInt/constructor-from-binary-string.js  | 13 +++++++---
 .../BigInt/constructor-from-decimal-string.js | 13 +++++++---
 .../BigInt/constructor-from-hex-string.js     | 13 +++++++---
 .../BigInt/constructor-from-octal-string.js   | 13 +++++++---
 .../constructor-from-string-syntax-errors.js  | 13 +++++++---
 test/built-ins/BigInt/constructor-integer.js  | 25 +++++++++++--------
 .../constructor-trailing-leading-spaces.js    | 16 +++++++++---
 .../BigInt/prototype/Symbol.toStringTag.js    |  2 +-
 .../thisbigintvalue-not-valid-throws.js       |  2 +-
 ...{value-of-throws.js => tostring-throws.js} | 10 +-------
 test/built-ins/BigInt/valueof-throws.js       | 21 ++++++++++++++++
 24 files changed, 123 insertions(+), 54 deletions(-)
 rename test/built-ins/BigInt/{value-of-throws.js => tostring-throws.js} (72%)
 create mode 100644 test/built-ins/BigInt/valueof-throws.js

diff --git a/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js b/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js
index b1e2d3f7b9..950cda9f6e 100644
--- a/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js
+++ b/test/built-ins/BigInt/asIntN/bigint-tobigint-errors.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asIntN ( bits, bigint )
 
   2. Let bigint ? ToBigInt(bigint).
-features: [BigInt, Symbol, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.throws(TypeError, function() {
diff --git a/test/built-ins/BigInt/asIntN/bigint-tobigint-toprimitive.js b/test/built-ins/BigInt/asIntN/bigint-tobigint-toprimitive.js
index e2663a00b6..fe0a702faf 100644
--- a/test/built-ins/BigInt/asIntN/bigint-tobigint-toprimitive.js
+++ b/test/built-ins/BigInt/asIntN/bigint-tobigint-toprimitive.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asIntN ( bits, bigint )
 
   2. Let bigint ? ToBigInt(bigint).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 function err() {
diff --git a/test/built-ins/BigInt/asIntN/bigint-tobigint-wrapped-values.js b/test/built-ins/BigInt/asIntN/bigint-tobigint-wrapped-values.js
index 2ee3a6c6bb..5b2a3956c3 100644
--- a/test/built-ins/BigInt/asIntN/bigint-tobigint-wrapped-values.js
+++ b/test/built-ins/BigInt/asIntN/bigint-tobigint-wrapped-values.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asIntN ( bits, bigint )
 
   2. Let bigint ? ToBigInt(bigint).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.sameValue(BigInt.asIntN(2, Object(0n)), 0n, "ToPrimitive: unbox object with internal slot");
diff --git a/test/built-ins/BigInt/asIntN/bits-toindex-errors.js b/test/built-ins/BigInt/asIntN/bits-toindex-errors.js
index 892c480175..9f2fabb1c1 100644
--- a/test/built-ins/BigInt/asIntN/bits-toindex-errors.js
+++ b/test/built-ins/BigInt/asIntN/bits-toindex-errors.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asIntN ( bits, bigint )
 
   1. Let bits be ? ToIndex(bits).
-features: [BigInt, Symbol, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.throws(RangeError, function() {
diff --git a/test/built-ins/BigInt/asIntN/bits-toindex-toprimitive.js b/test/built-ins/BigInt/asIntN/bits-toindex-toprimitive.js
index c6b874a84e..10ffd610f8 100644
--- a/test/built-ins/BigInt/asIntN/bits-toindex-toprimitive.js
+++ b/test/built-ins/BigInt/asIntN/bits-toindex-toprimitive.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asIntN ( bits, bigint )
 
   1. Let bits be ? ToIndex(bits).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 function err() {
diff --git a/test/built-ins/BigInt/asIntN/bits-toindex-wrapped-values.js b/test/built-ins/BigInt/asIntN/bits-toindex-wrapped-values.js
index cb9a5832a1..94e5635e06 100644
--- a/test/built-ins/BigInt/asIntN/bits-toindex-wrapped-values.js
+++ b/test/built-ins/BigInt/asIntN/bits-toindex-wrapped-values.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asIntN ( bits, bigint )
 
   1. Let bits be ? ToIndex(bits).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.sameValue(BigInt.asIntN(Object(0), 1n), 0n, "ToPrimitive: unbox object with internal slot");
diff --git a/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js b/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js
index 3df6cf7144..924e3decb1 100644
--- a/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js
+++ b/test/built-ins/BigInt/asUintN/bigint-tobigint-errors.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asUintN ( bits, bigint )
 
   2. Let bigint ? ToBigInt(bigint).
-features: [BigInt, Symbol, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.throws(TypeError, function() {
diff --git a/test/built-ins/BigInt/asUintN/bigint-tobigint-toprimitive.js b/test/built-ins/BigInt/asUintN/bigint-tobigint-toprimitive.js
index 15bfa47759..1aff2080c3 100644
--- a/test/built-ins/BigInt/asUintN/bigint-tobigint-toprimitive.js
+++ b/test/built-ins/BigInt/asUintN/bigint-tobigint-toprimitive.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asUintN ( bits, bigint )
 
   2. Let bigint ? ToBigInt(bigint).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 function err() {
diff --git a/test/built-ins/BigInt/asUintN/bigint-tobigint-wrapped-values.js b/test/built-ins/BigInt/asUintN/bigint-tobigint-wrapped-values.js
index 49741b9397..3362b284d9 100644
--- a/test/built-ins/BigInt/asUintN/bigint-tobigint-wrapped-values.js
+++ b/test/built-ins/BigInt/asUintN/bigint-tobigint-wrapped-values.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asUintN ( bits, bigint )
 
   2. Let bigint ? ToBigInt(bigint).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.sameValue(BigInt.asUintN(2, Object(0n)), 0n, "ToPrimitive: unbox object with internal slot");
diff --git a/test/built-ins/BigInt/asUintN/bits-toindex-errors.js b/test/built-ins/BigInt/asUintN/bits-toindex-errors.js
index 9b42b295d1..3967dab25d 100644
--- a/test/built-ins/BigInt/asUintN/bits-toindex-errors.js
+++ b/test/built-ins/BigInt/asUintN/bits-toindex-errors.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asUintN ( bits, bigint )
 
   1. Let bits be ? ToIndex(bits).
-features: [BigInt, Symbol, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.throws(RangeError, function() {
diff --git a/test/built-ins/BigInt/asUintN/bits-toindex-toprimitive.js b/test/built-ins/BigInt/asUintN/bits-toindex-toprimitive.js
index 68a0421a90..4933da2fbf 100644
--- a/test/built-ins/BigInt/asUintN/bits-toindex-toprimitive.js
+++ b/test/built-ins/BigInt/asUintN/bits-toindex-toprimitive.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asUintN ( bits, bigint )
 
   1. Let bits be ? ToIndex(bits).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 function err() {
diff --git a/test/built-ins/BigInt/asUintN/bits-toindex-wrapped-values.js b/test/built-ins/BigInt/asUintN/bits-toindex-wrapped-values.js
index 3b78835cd0..ac754ee4e7 100644
--- a/test/built-ins/BigInt/asUintN/bits-toindex-wrapped-values.js
+++ b/test/built-ins/BigInt/asUintN/bits-toindex-wrapped-values.js
@@ -7,7 +7,7 @@ info: |
   BigInt.asUintN ( bits, bigint )
 
   1. Let bits be ? ToIndex(bits).
-features: [BigInt, Symbol.toPrimitive, computed-property-names]
+features: [BigInt, computed-property-names, Symbol, Symbol.toPrimitive]
 ---*/
 
 assert.sameValue(BigInt.asUintN(Object(0), 1n), 0n, "ToPrimitive: unbox object with internal slot");
diff --git a/test/built-ins/BigInt/constructor-empty-string.js b/test/built-ins/BigInt/constructor-empty-string.js
index e8b2fb52b4..5eb5def02c 100644
--- a/test/built-ins/BigInt/constructor-empty-string.js
+++ b/test/built-ins/BigInt/constructor-empty-string.js
@@ -5,9 +5,17 @@
 description: Empty String should in BigInt should result into 0n
 esid: sec-string-to-bigint
 info: |
-  Apply the algorithm in 3.1.3.1 with the following changes:
+  ToBigInt ( argument )
 
-  EDITOR'S NOTE StringToBigInt("") is 0n according to the logic in 3.1.3.1.
+  String:
+
+  Let n be StringToBigInt(prim).
+  If n is NaN, throw a SyntaxError exception.
+  Return n.
+
+  StringToBigInt ( argument )
+
+  Replace the StrUnsignedDecimalLiteral production with DecimalDigits to not allow Infinity, decimal points, or exponents.
 
 features: [BigInt]
 ---*/
diff --git a/test/built-ins/BigInt/constructor-from-binary-string.js b/test/built-ins/BigInt/constructor-from-binary-string.js
index 35cfda0acb..1b675b4727 100644
--- a/test/built-ins/BigInt/constructor-from-binary-string.js
+++ b/test/built-ins/BigInt/constructor-from-binary-string.js
@@ -5,10 +5,17 @@
 description: String should be parsed to BigInt according StringToBigInt
 esid: sec-string-to-bigint
 info: |
-  Apply the algorithm in 3.1.3.1 with the following changes:
+  ToBigInt ( argument )
 
-  - Replace the StrUnsignedDecimalLiteral production with DecimalDigits
-    to not allow decimal points or exponents.
+  String:
+
+  Let n be StringToBigInt(prim).
+  If n is NaN, throw a SyntaxError exception.
+  Return n.
+
+  StringToBigInt ( argument )
+
+  Replace the StrUnsignedDecimalLiteral production with DecimalDigits to not allow Infinity, decimal points, or exponents.
 
 features: [BigInt]
 ---*/
diff --git a/test/built-ins/BigInt/constructor-from-decimal-string.js b/test/built-ins/BigInt/constructor-from-decimal-string.js
index c732b7f7aa..ecb128feed 100644
--- a/test/built-ins/BigInt/constructor-from-decimal-string.js
+++ b/test/built-ins/BigInt/constructor-from-decimal-string.js
@@ -5,10 +5,17 @@
 description: String should be parsed to BigInt according StringToBigInt
 esid: sec-string-to-bigint
 info: |
-  Apply the algorithm in 3.1.3.1 with the following changes:
+  ToBigInt ( argument )
 
-  - Replace the StrUnsignedDecimalLiteral production with DecimalDigits
-    to not allow decimal points or exponents.
+  String:
+
+  Let n be StringToBigInt(prim).
+  If n is NaN, throw a SyntaxError exception.
+  Return n.
+
+  StringToBigInt ( argument )
+
+  Replace the StrUnsignedDecimalLiteral production with DecimalDigits to not allow Infinity, decimal points, or exponents.
 
 features: [BigInt]
 ---*/
diff --git a/test/built-ins/BigInt/constructor-from-hex-string.js b/test/built-ins/BigInt/constructor-from-hex-string.js
index f26b9d2698..1841559d2a 100644
--- a/test/built-ins/BigInt/constructor-from-hex-string.js
+++ b/test/built-ins/BigInt/constructor-from-hex-string.js
@@ -5,10 +5,17 @@
 description: Hexdecimal prefixed String should be parsed to BigInt according StringToBigInt
 esid: sec-string-to-bigint
 info: |
-  Apply the algorithm in 3.1.3.1 with the following changes:
+  ToBigInt ( argument )
 
-  - Replace the StrUnsignedDecimalLiteral production with DecimalDigits
-    to not allow decimal points or exponents.
+  String:
+
+  Let n be StringToBigInt(prim).
+  If n is NaN, throw a SyntaxError exception.
+  Return n.
+
+  StringToBigInt ( argument )
+
+  Replace the StrUnsignedDecimalLiteral production with DecimalDigits to not allow Infinity, decimal points, or exponents.
 
 features: [BigInt]
 ---*/
diff --git a/test/built-ins/BigInt/constructor-from-octal-string.js b/test/built-ins/BigInt/constructor-from-octal-string.js
index 59d18c64d1..f4093fa96a 100644
--- a/test/built-ins/BigInt/constructor-from-octal-string.js
+++ b/test/built-ins/BigInt/constructor-from-octal-string.js
@@ -5,10 +5,17 @@
 description: Octal prefixed String should be parsed to BigInt according StringToBigInt
 esid: sec-string-to-bigint
 info: |
-  Apply the algorithm in 3.1.3.1 with the following changes:
+  ToBigInt ( argument )
 
-  - Replace the StrUnsignedDecimalLiteral production with DecimalDigits
-    to not allow decimal points or exponents.
+  String:
+
+  Let n be StringToBigInt(prim).
+  If n is NaN, throw a SyntaxError exception.
+  Return n.
+
+  StringToBigInt ( argument )
+
+  Replace the StrUnsignedDecimalLiteral production with DecimalDigits to not allow Infinity, decimal points, or exponents.
 
 features: [BigInt]
 ---*/
diff --git a/test/built-ins/BigInt/constructor-from-string-syntax-errors.js b/test/built-ins/BigInt/constructor-from-string-syntax-errors.js
index 6bdd6f3cbc..0e5defa0d9 100644
--- a/test/built-ins/BigInt/constructor-from-string-syntax-errors.js
+++ b/test/built-ins/BigInt/constructor-from-string-syntax-errors.js
@@ -5,10 +5,17 @@
 description: Invalid String into BigInt constructor should throw SyntaxError
 esid: sec-string-to-bigint
 info: |
-  Apply the algorithm in 3.1.3.1 with the following changes:
+  ToBigInt ( argument )
 
-  - Replace the StrUnsignedDecimalLiteral production with DecimalDigits
-    to not allow decimal points or exponents.
+  String:
+
+  Let n be StringToBigInt(prim).
+  If n is NaN, throw a SyntaxError exception.
+  Return n.
+
+  StringToBigInt ( argument )
+
+  Replace the StrUnsignedDecimalLiteral production with DecimalDigits to not allow Infinity, decimal points, or exponents.
 
 features: [BigInt]
 ---*/
diff --git a/test/built-ins/BigInt/constructor-integer.js b/test/built-ins/BigInt/constructor-integer.js
index 36e37e60e6..b416e43ecc 100644
--- a/test/built-ins/BigInt/constructor-integer.js
+++ b/test/built-ins/BigInt/constructor-integer.js
@@ -3,7 +3,7 @@
 
 /*---
 description: BigInt constructor called with integer argument
-esid: sec-bigint-constructor
+esid: sec-bigint-constructor-number-value
 info: |
   BigInt ( value )
 
@@ -17,15 +17,20 @@ info: |
 features: [BigInt]
 ---*/
 
-assert.sameValue(BigInt(Number.MAX_SAFE_INTEGER), 9007199254740991n);
+assert.sameValue(
+  BigInt(Number.MAX_SAFE_INTEGER), 9007199254740991n,
+  "BigInt(Number.MAX_SAFE_INTEGER) === 9007199254740991n"
+);
 
-assert.sameValue(BigInt(-Number.MAX_SAFE_INTEGER), -9007199254740991n);
+assert.sameValue(
+  BigInt(-Number.MAX_SAFE_INTEGER), -9007199254740991n,
+  "BigInt(-Number.MAX_SAFE_INTEGER) === -9007199254740991n"
+);
 
-var pos = Math.pow(2, 53);
-var neg = -pos;
+assert.throws(RangeError, function() {
+  BigInt(Number.MAX_SAFE_INTEGER + 1);
+}, "BigInt(Number.MAX_SAFE_INTEGER + 1) throws RangeError");
 
-assert.sameValue(BigInt(pos), 9007199254740992n,
-                 "BigInt(2**53) === 9007199254740992n");
-
-assert.sameValue(BigInt(neg), -9007199254740992n,
-                 "BigInt(2**53) === -9007199254740992n");
+assert.throws(RangeError, function() {
+  BigInt(-Number.MAX_SAFE_INTEGER - 1);
+}, "BigInt(-Number.MAX_SAFE_INTEGER - 1) throws RangeError");
diff --git a/test/built-ins/BigInt/constructor-trailing-leading-spaces.js b/test/built-ins/BigInt/constructor-trailing-leading-spaces.js
index 8db1a76ea6..9ffdc45f46 100644
--- a/test/built-ins/BigInt/constructor-trailing-leading-spaces.js
+++ b/test/built-ins/BigInt/constructor-trailing-leading-spaces.js
@@ -2,13 +2,21 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-description: Tariling/Leading spaces should be ignored in BigInt constructor should
+description: Trailing/Leading spaces should be ignored in BigInt constructor
 esid: sec-string-to-bigint
 info: |
-  Apply the algorithm in 3.1.3.1 with the following changes:
+  ToBigInt ( argument )
+
+  String:
+
+  Let n be StringToBigInt(prim).
+  If n is NaN, throw a SyntaxError exception.
+  Return n.
+
+  StringToBigInt ( argument )
+
+  Replace the StrUnsignedDecimalLiteral production with DecimalDigits to not allow Infinity, decimal points, or exponents.
 
-  - Replace the StrUnsignedDecimalLiteral production with DecimalDigits
-    to not allow decimal points or exponents.
 
 features: [BigInt]
 ---*/
diff --git a/test/built-ins/BigInt/prototype/Symbol.toStringTag.js b/test/built-ins/BigInt/prototype/Symbol.toStringTag.js
index ab55f21253..a64ff70bf2 100644
--- a/test/built-ins/BigInt/prototype/Symbol.toStringTag.js
+++ b/test/built-ins/BigInt/prototype/Symbol.toStringTag.js
@@ -11,7 +11,7 @@ info: |
     This property has the attributes { [[Writable]]: false, [[Enumerable]]:
     false, [[Configurable]]: true }.
 includes: [propertyHelper.js]
-features: [Symbol.toStringTag, BigInt, Symbol]
+features: [BigInt, Symbol, Symbol.toStringTag]
 ---*/
 
 verifyProperty(BigInt.prototype, Symbol.toStringTag, {
diff --git a/test/built-ins/BigInt/prototype/toString/thisbigintvalue-not-valid-throws.js b/test/built-ins/BigInt/prototype/toString/thisbigintvalue-not-valid-throws.js
index 92eee1c683..1e4a1bd6b2 100644
--- a/test/built-ins/BigInt/prototype/toString/thisbigintvalue-not-valid-throws.js
+++ b/test/built-ins/BigInt/prototype/toString/thisbigintvalue-not-valid-throws.js
@@ -16,7 +16,7 @@ info: |
   2. If Type(value) is Object and value has a [[BigIntData]] internal slot, then
     ...
   3. Throw a TypeError exception.
-features: [BigInt, Symbol.toPrimitive]
+features: [BigInt, Symbol, Symbol.toPrimitive]
 ---*/
 
 var toString = BigInt.prototype.toString;
diff --git a/test/built-ins/BigInt/value-of-throws.js b/test/built-ins/BigInt/tostring-throws.js
similarity index 72%
rename from test/built-ins/BigInt/value-of-throws.js
rename to test/built-ins/BigInt/tostring-throws.js
index 671a9b94ca..031a85e1ea 100644
--- a/test/built-ins/BigInt/value-of-throws.js
+++ b/test/built-ins/BigInt/tostring-throws.js
@@ -2,7 +2,7 @@
 // This code is governed by the BSD license found in the LICENSE file.
 
 /*---
-description: Throws exception in BigIntConstructor if valueOf/toString does that
+description: Throws exception in BigIntConstructor if toString throws
 esid: sec-bigint-constructor-number-value
 info: |
   1. If NewTarget is not undefined, throw a TypeError exception.
@@ -12,14 +12,6 @@ info: |
 features: [BigInt]
 ---*/
 
-assert.throws(Test262Error, function() {
-  BigInt({
-    valueOf: function() {
-      throw new Test262Error();
-    }
-  });
-});
-
 assert.throws(Test262Error, function() {
   BigInt({
     toString: function() {
diff --git a/test/built-ins/BigInt/valueof-throws.js b/test/built-ins/BigInt/valueof-throws.js
new file mode 100644
index 0000000000..7e3cef1f39
--- /dev/null
+++ b/test/built-ins/BigInt/valueof-throws.js
@@ -0,0 +1,21 @@
+// Copyright (C) 2017 Caio Lima. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: Throws exception in BigIntConstructor if valueOf throws
+esid: sec-bigint-constructor-number-value
+info: |
+  1. If NewTarget is not undefined, throw a TypeError exception.
+  2. Let prim be ? ToPrimitive(value, hint Number).
+  3. If Type(prim) is Number, return ? NumberToBigInt(prim).
+  4. Otherwise, return ? ToBigInt(value).
+features: [BigInt]
+---*/
+
+assert.throws(Test262Error, function() {
+  BigInt({
+    valueOf: function() {
+      throw new Test262Error();
+    }
+  });
+});