avoid re-using Test262Error

Author: bakkot

test/built-ins/Iterator/prototype/drop/argument-validation-failure-closes-underlying.js

@@ -41,7 +41,8 @@ assert.throws(RangeError, function() {
 assert.sameValue(closed, true);
 
 closed = false;
-assert.throws(Test262Error, function() {
-  closable.drop({ get valueOf() { throw new Test262Error(); }});
+class ShouldNotGetValueOf {}
+assert.throws(ShouldNotGetValueOf, function() {
+  closable.drop({ get valueOf() { throw new ShouldNotGetValueOf(); }});
 });
 assert.sameValue(closed, true);

test/built-ins/Iterator/prototype/take/argument-validation-failure-closes-underlying.js

@@ -41,7 +41,8 @@ assert.throws(RangeError, function() {
 assert.sameValue(closed, true);
 
 closed = false;
-assert.throws(Test262Error, function() {
-  closable.take({ get valueOf() { throw new Test262Error(); }});
+class ShouldNotGetValueOf {}
+assert.throws(ShouldNotGetValueOf, function() {
+  closable.take({ get valueOf() { throw new ShouldNotGetValueOf(); }});
 });
 assert.sameValue(closed, true);