[Webkit-unassigned] [Bug 106176] New: Non-helpful SyntaxError message for duplicate parameters in strict mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=106176

           Summary: Non-helpful SyntaxError message for duplicate
                    parameters in strict mode
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: andre.bargull at gmail.com


The current SyntaxError message isn't really that helpful. 

test cases:
---
> function f(a,a){'use strict'}
Exception: SyntaxError: Unexpected token '}'
> function f(a,a){'use strict'; ''} 
Exception: SyntaxError: Unexpected string ''
> function f(a,a){'use strict'; return a}
Exception: SyntaxError: Return statements are only valid inside functions
---

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