Which @angular/* package(s) are the source of the bug?

Don't known / other

Is this a regression?

Yes

Description

The control-flow migration changes code like this:
<div *ngFor="let foo of foos; index as $index;"></div>
into:
@for (foo of foos; track foo; let $index = $index) { <div></div> }
This code, while odd, compiled ok in Angular 17. It no longer compiles in Angular 18. The migration should leave off index variables that are aliased to $index.

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

No response

Please provide the environment you discovered this bug in (run ng version)

No response

Anything else?

No response