Move attribute enforcement from v9 to preview

[T-Gro]

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[vzarytovskii]

@T-Gro did you confirm that this feature is causing the regression?

[T-Gro]

@T-Gro did you confirm that this feature is causing the regression?

See the modified tests, the "No constructors are available for the type" issue is the same as the original. (and should not be there, because the type does have a constructor)

[edgarfgp]

I do not remember modifying this file as part of my PRs 🧐.

[T-Gro]

The negative typecheck tests do not run with langver=preview, this was only modified when the feature was enabled by default: https://github.com/dotnet/fsharp/pull/17558/files#diff-036387972a5f139a8b0f05f5b702666c5d77d961a15f0b9ac170264d79dd1c11

[edgarfgp]

@vzarytovskii should be this reverted now that #17731 has been fixed ?

[vzarytovskii]

@vzarytovskii should be this reverted now that #17731 has been fixed ?

Yes, it won't make it to release though

[edgarfgp]

@vzarytovskii should be this reverted now that #17731 has been fixed ?

Yes, it won't make it to release though

But it will be in one of the point releases right ?

[vzarytovskii]

@vzarytovskii should be this reverted now that #17731 has been fixed ?

Yes, it won't make it to release though

But it will be in one of the point releases right ?

Yeah