Bug 157974 – [JSC] incorrectly reports SyntaxError when destructuring `let`

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Caitlin Potter (:caitp)]

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 :)

Pull request: https://github.com/WebKit/WebKit/pull/32212

[EWS]

Committed 283217@main (dbcb33d932fc): <https://commits.webkit.org/283217@main>

Reviewed commits have been landed. Closing PR #32212 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/135353378>