[Webkit-unassigned] [Bug 220517] New: SyntaxError Duplicate parameter in function with destructuring with assignment

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220517

            Bug ID: 220517
           Summary: SyntaxError Duplicate parameter in function with
                    destructuring with assignment
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ychris2010-1 at yahoo.com

Webkit throws a SyntaxError with message "Duplicate parameter <name> not allowed in function with destructuring parameters." when attempting to assign a function to another variable. This does not occur if the function is declared separately from the assignment.

Works:

function a({ test: a }) { console.log(a); }
let b = a;

Throws SyntaxError:

let b = function a({ test: a }) { console.log(a); };


Reproduced with Webkit build 271364

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