Bug 190889 – Throw early ReferenceError for invalid AssignmentTargetType

• Status: RESOLVED
• Resolution: DUPLICATE
• Component: JavaScriptCore

[Leo Balter]

While I was working on new tests for import() I found that JSC is not throwing early ReferenceErrors described in updateexpressions and assignmentexpressions.

This commit lists some examples:

https://github.com/tc39/test262/pull/1897/commits/04d40998568e093c87a887e68029d247e126806e

The ReferenceError happens on runtime evaluation phase, it should happen in the parse phase.

Some examples using dynamic import:

```
import('')--
import('')++
++import('')
--import('')
import('') = 1
import('') *= 1
```

I also found this bug is not only for dynamic import and it's happening with other invalid AssignmentTargetTypes:

```
throw "foo"; (() => 1) = 1
```

The code above should throw a ReferenceError and not "foo".

---

This bug might be a duplicate of Bug 177218, but I didn't have time to fully review this other report, yet.

[Ross Kirsling]

Yeah, bug 177218 appears to be the general bug for "JSC lacks the notion of an early ReferenceError".

[Ross Kirsling]

*** This bug has been marked as a duplicate of bug 197603 ***