[Webkit-unassigned] [Bug 157974] New: [JSC] incorrectly reports SyntaxError when destructuring `let`

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Sat May 21 14:01:56 PDT 2016


            Bug ID: 157974
           Summary: [JSC] incorrectly reports SyntaxError when
                    destructuring `let`
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: caitp at igalia.com

Right now, the parser eagerly reports an error when parsing an ObjectPattern (with DestructuringKind::DestructureToLet), as soon as it encounters the identifier "let" is encountered, without knowing if "let" is the intended destructuring target / binding identifier or not.

Example code:

let {let: a} = {let: 1 }

This should declare a lexical variable `a` initialized to `1`, but instead reports a SyntaxError. It's just a case of reporting the error a bit too early, before it's known whether it's the binding target or not. Easy fix, good first bug :)

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