Bug 5414 – 'SyntaxError: Invalid return statement' in JS console whenever Safari window activated/used

• Status: RESOLVED
• Resolution: INVALID
• Component: JavaScriptCore

[Daniel Udey]

In the WebKit nightly builds (both on the latest CVS nightly and the build from Oct 1), my Javascript 
console fills up with 'SyntaxError: Invalid return statement' errors pretty much instantly. Whenever I Cmd-~ 
back to the Safari window, I get a list of them, if I tab out and back I get more, if I mouse around over 
elements I get more, if I load a new page I get more, and so on.

All of the errors are reported to be on 'line 1', except the first error that is thrown after a page is loaded, 
which is on 'line 300'. This is making it somewhat difficult to debug Javascript issues.

[Daniel Udey]

Created attachment 4403 [details]
Demonstration movie of the bug on about:blank

Here is a small video of this occurring on my system using the latest WebKit
CVS from http://nightly.webkit.org/builds/ - In the movie, I clear the
Javascript console, Cmd-~ to the main window and back, clear the console, and
Cmd-~ again.

[Daniel Udey]

This bug is due to an incompatibility between the latest WebKit CVS builds and the WebDev Additions 
plugin for Safari. Closing and forwarding to them for consideration.