Bug 260324 – Incorrect error message in accidental function call

• Status: RESOLVED
• Resolution: FIXED
• Component: JavaScriptCore

[SheetJS]

Reproduction:

```js
console.log("hi")
(async() => {
	console.log("hi");
	console.log("hi");
	console.log("hi");
	console.log("hi");
	console.log("hi");
	console.log("hi");
})();
```

This is interpreted as `console.log("hi")(/*...*/)();` and throws an error since `console.log("hi")` returns `undefined`.

.

V8 correctly diagnoses the error.  Running in the Chrome DevTools shows the error:

```
Uncaught TypeError: console.log(...) is not a function
```

.

Safari 16 and Bun 0.7.3 both misdiagnose the error:

```
TypeError: console.log is not a function. (In 'console.log("hi")', 'console.log' is undefined)
```

To be clear, `console.log` is not undefined in context.

.

This appears to be related to the size of the function body.  For example, if one of the console calls is removed:

```js
console.log("hi")
(async() => {
	console.log("hi");
	console.log("hi");
	console.log("hi");
	console.log("hi");
	console.log("hi");
})();
```

Safari and Bun both show correct error messages:

```
TypeError: console.log("hi")
 is not a function. (In 'console.log("hi")
(async() => {
	console.log("hi");
	console.log("hi");
	console.log("hi");
	console.log("hi");
	console.log("hi");
})', 'console.log("hi")
' is undefined)
```

This message is correct: `console.log("hi")` is undefined.

[Radar WebKit Bug Importer]

<rdar://problem/114357179>

[Mark Lam]

This incorrect error message is an accidental by-product of a truncated error message.  I'll be fixing this by compressing ExpressionInfo as well as changing it to no longer discard divot info.

[Mark Lam]

Pull request: https://github.com/WebKit/WebKit/pull/22880

[EWS]

Committed 273233@main (126d2027f1ce): <https://commits.webkit.org/273233@main>

Reviewed commits have been landed. Closing PR #22880 and removing active labels.