[Webkit-unassigned] [Bug 272524] New: Should throw syntax error for logical assignment that LHS is function call

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=272524

            Bug ID: 272524
           Summary: Should throw syntax error for logical assignment that
                    LHS is function call
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aosukeke at gmail.com

According to the spec[1], syntax error should be thrown for logical assignment expressions that LHS is a function call.

```js
function foo() {}
foo() &&= 3;
```

According to https://commits.webkit.org/223412@main, it was intentional that JSC not throw a syntax error for this.
However, four years have passed since then, and the related specifications have not been updated. Also V8 and SpiderMonkey throw his Syntax Error.

```
$ cat ./logical-assignment-syntax-error.js 
function foo() {}
foo() ??= 3;

$ eshost ./logical-assignment-syntax-error.js 
#### JavaScriptCore

ReferenceError: Left side of assignment is not a reference.

#### SpiderMonkey

SyntaxError: invalid assignment left-hand side:

#### V8

SyntaxError: Invalid left-hand side in assignment
```

So I think JSC should also follow the specifications.

[1]: https://tc39.es/ecma262/#sec-assignment-operators-static-semantics-early-errors

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