Ron Buckton

Are v8-canary builds for Windows still broken? I've been using a build from last September to test out the V8 dev trial for the [Shared Structs proposal](https://github.com/tc39/proposal-structs), but haven't been...

I've added a test to test262 to verify this: https://github.com/tc39/test262/pull/4483/commits/fc3079a585d827fdd094f323674e1e2d66f531d4 This also appears to be a [bug in TypeScript](https://github.com/microsoft/TypeScript/issues/61747): 

I can verify this is parsed incorrectly in V8 13.6.233.8: > ``` > Welcome to Node.js v24.0.2. > Type ".help" for more information. > > for (using x = null;;)...

It matches `var`, `let`, and `const` in the same position.

> Is there a reason we use the `RegularExpressionFlags` production and restrict it with an early error instead of introducing a new, more restricted production? Is there a reason not...

> I believe `RegularExpressionFlags` is not restricted in the grammar because `RegularExpressionLiteral` needs to not change when we add new flags. This is due to the overlap with division. We...

Now that both V8 and SpiderMonkey are shipping regex modifiers, I'm hoping to request Stage 4 at the October plenary. As such I'm working on updating this PR so that...

@michaelficarra I went ahead and added a `RegularExpressionModifiers` production that just restricts the allowed characters to `ims`, and continues to use an early error to check for duplicates.

Outside of updating from `main`, is there anything preventing this from being merged now that it has Stage 4?

Closed in favor of #27