1564825 - Misleading Syntax Error when re-declaring an ES6 class

Status: REOPENED

(Core :: JavaScript Engine, enhancement, P3)

Description

[Nicolas Chevobbe [:nchevobbe][PTO - back January 2nd]]

Steps to reproduce

1. Go to data:text/html,<meta charset=utf8><script>class A{}</script><script>class A{}</script>
2. Open the webconsole

Expected results

I see the following message:

SyntaxError: redeclaration of class A

Actual results

SyntaxError: redeclaration of let A

---

Opening the following page does give me the expected error message though: data:text/html,<meta charset=utf8><script>class A{};class A{}</script>

Comment 2

[Matthew Gaudet (he/him) [:mgaudet]]

Reopening this instead of Bug 1428672, which the original bug was resolved.

Future attempts to solve this one should nevertheless reference that bug, as there's valuable information in there.