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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - REGRESSION: Error's "column" property should not be readonly"
href="https://bugs.webkit.org/show_bug.cgi?id=146047">146047</a>
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<th>Summary</th>
<td>REGRESSION: Error's "column" property should not be readonly
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>528+ (Nightly build)
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>JavaScriptCore
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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<th>Reporter</th>
<td>joepeck@webkit.org
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<th>CC</th>
<td>mark.lam@apple.com, webkit-bug-importer@group.apple.com
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<pre>* SUMMARY
Error's "column" property should not be readonly. This used to work in Safari 8, but now fails in ToT WebKit.
* TEST
<script>
"use strict";
var error = new Error('My Error Message');
error.lineNumber = 1;
error.column = 2; // Should not trigger a TypeError.
console.log("SUCCESS", error);
</script>
* STEPS TO REPRODUCE
1. Open attached test case
=> get an error attempting to set error.column, used to work
=> [Error] TypeError: Attempted to assign to readonly property.
* NOTES
- Firefox and Chrome do not throw an error
- This is done in the Esprima JS Library, so there may also be other libraries that do this and expect it to work
* DESCRIPTORS
<span class="quote">> Object.getOwnPropertyDescriptor(error, "column")</span >
< {value: 22, writable: false, enumerable: true, configurable: false} = $2
<span class="quote">> Object.getOwnPropertyDescriptor(error, "lineNumber")</span >
< {value: 1, writable: true, enumerable: true, configurable: true} = $3</pre>
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