[Webkit-unassigned] [Bug 123506] New: JavaScript parser bug

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=123506

           Summary: JavaScript parser bug
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: https://gist.github.com/mishoo/7230949
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mihai.bazon at gmail.com


// fails with SyntaxError: Expected token ')'
( function(){ return this || eval('this'); }().x = "y" );

// fails with SyntaxError: Unexpected token '='
1, function(){ return this || eval('this'); }().x = "y";

//// weird that we get different error messages

//// The following all work.

// place the function call inside parens
( (function(){ return this || eval('this'); }()).x = "y" );
1, (function(){ return this || eval('this'); }()).x = "y";

// simplify the return expression, keep `then`
( function(){ return this; }().x = "y" );
1, function(){ return this; }().x = "y";

// keep `eval`
( function(){ return eval('this'); }().x = "y" );
1, function(){ return eval('this'); }().x = "y";

// place the return expression inside parens (!!)
( function(){ return ( this || eval('this') ); }().x = "y" );
1, function(){ return ( this || eval('this') ); }().x = "y";

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