diff --git a/harness/sta.js b/harness/sta.js
index 8ad77739e5..42dd47e2eb 100644
--- a/harness/sta.js
+++ b/harness/sta.js
@@ -24,6 +24,5 @@ $ERROR = function $ERROR(message) {
 };
 
 function $DONOTEVALUATE() {
-  // This function MUST NOT throw a Test262Error.
   throw "Test262: This statement should not be evaluated.";
 }
diff --git a/test/built-ins/String/prototype/split/limit-touint32-error.js b/test/built-ins/String/prototype/split/limit-touint32-error.js
index e7b1c9326b..7f9c83ee87 100644
--- a/test/built-ins/String/prototype/split/limit-touint32-error.js
+++ b/test/built-ins/String/prototype/split/limit-touint32-error.js
@@ -9,14 +9,22 @@ info: |
   1. If _lim_ = 0, return _A_.
 ---*/
 
+function ExpectedError(message) {
+  this.message = message || "";
+}
+ExpectedError.prototype.toString = function () {
+  return "ExpectedError: " + this.message;
+};
+
 var nonStringableSeparator = {};
-nonStringableSeparator[Symbol.toPrimitive] = $DONOTEVALUATE;
-nonStringableSeparator.toString = $DONOTEVALUATE;
-nonStringableSeparator.valueOf = $DONOTEVALUATE;
+nonStringableSeparator[Symbol.toPrimitive] =
+  function() { throw new Test262Error("separator[Symbol.toPrimitive]"); };
+nonStringableSeparator.toString = function() { throw new Test262Error("separator.toString"); };
+nonStringableSeparator.valueOf = function() { throw new Test262Error("separator.valueOf"); };
 
 var nonNumberableLimit = {};
-nonStringableSeparator[Symbol.toPrimitive] = function() { throw new Test262Error(); };
+nonNumberableLimit[Symbol.toPrimitive] = function() { throw new ExpectedError(); };
 
-assert.throws(Test262Error, function() {
+assert.throws(ExpectedError, function() {
   "foo".split(nonStringableSeparator, nonNumberableLimit);
 }, 'ToUint32 should be called on the limit before ToString on the separator.');
diff --git a/test/built-ins/String/prototype/split/separator-tostring-error.js b/test/built-ins/String/prototype/split/separator-tostring-error.js
index 1ebaf0ca0d..f96aec5728 100644
--- a/test/built-ins/String/prototype/split/separator-tostring-error.js
+++ b/test/built-ins/String/prototype/split/separator-tostring-error.js
@@ -8,9 +8,16 @@ info: |
   1. If _lim_ = 0, return _A_.
 ---*/
 
-var nonStringableSeparator = {};
-nonStringableSeparator.toString = function() { throw new Test262Error(); };
+function ExpectedError(message) {
+  this.message = message || "";
+}
+ExpectedError.prototype.toString = function () {
+  return "ExpectedError: " + this.message;
+};
 
-assert.throws(Test262Error, function() {
+var nonStringableSeparator = {};
+nonStringableSeparator.toString = function() { throw new ExpectedError(); };
+
+assert.throws(ExpectedError, function() {
   "foo".split(nonStringableSeparator, 0);
 }, 'ToString should be called on the separator before checking if the limit is zero.');
diff --git a/test/built-ins/String/prototype/split/this-value-tostring-error.js b/test/built-ins/String/prototype/split/this-value-tostring-error.js
index 8e87ff3c4a..46b2393d10 100644
--- a/test/built-ins/String/prototype/split/this-value-tostring-error.js
+++ b/test/built-ins/String/prototype/split/this-value-tostring-error.js
@@ -12,10 +12,17 @@ info: |
   1. Let _S_ be ? ToString(_O_).
 ---*/
 
+function ExpectedError(message) {
+  this.message = message || "";
+}
+ExpectedError.prototype.toString = function () {
+  return "ExpectedError: " + this.message;
+};
+
 var split = String.prototype.split;
 
 var nonStringableReceiver = {};
-nonStringableReceiver.toString = function() { throw new Test262Error(); };
+nonStringableReceiver.toString = function() { throw new ExpectedError("receiver.toString"); };
 
 var splitter = {};
 splitter[Symbol.split] = function() {};
@@ -28,10 +35,11 @@ try {
 }
 
 var nonStringableSeparator = {};
-nonStringableSeparator[Symbol.toPrimitive] = $DONOTEVALUATE;
-nonStringableSeparator.toString = $DONOTEVALUATE;
-nonStringableSeparator.valueOf = $DONOTEVALUATE;
+nonStringableSeparator[Symbol.toPrimitive] =
+  function() { throw new Test262Error("separator[Symbol.toPrimitive]"); };
+nonStringableSeparator.toString = function() { throw new Test262Error("separator.toString"); };
+nonStringableSeparator.valueOf = function() { throw new Test262Error("separator.valueOf"); };
 
-assert.throws(Test262Error, function() {
+assert.throws(ExpectedError, function() {
   split.call(nonStringableReceiver, nonStringableSeparator, Symbol());
 }, 'ToString should be called on the receiver before processing the separator or limit.');