[Webkit-unassigned] [Bug 161408] New: [JSC] ArrowFormalParameters and MethodDefinition parameters do not use StrictFormalParameters restrictions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=161408

            Bug ID: 161408
           Summary: [JSC] ArrowFormalParameters and MethodDefinition
                    parameters do not use StrictFormalParameters
                    restrictions
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: caitp at igalia.com

ArrowFormalParameters and MethodDefinition parameters should be parsed according to the StrictFormalParameters production (https://tc39.github.io/ecma262/#sec-arrow-function-definitions, https://tc39.github.io/ecma262/#prod-MethodDefinition).

Per https://tc39.github.io/ecma262/#sec-function-definitions-static-semantics-early-errors, these functions should not parse successfully when there are duplicate formal parameters.

E.g.

var f = (a, a) => 1 /* should be SyntaxError */
var O = {
  m(a, a) { return 1; } /* should be SyntaxError */
};

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