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Aren't we doing that right now?

Thanks. It would but something like this shouldn't have passed internal QA in the first place. A compiler engineer would have known that the first thing you do when solving something like this is to write a regression test to first reproduce the problem and later verify that it is fixed. Maybe it would be a good idea if they hired some - compiler engineers, that is.

It's called the April patch - but it's out now ! https://blogs.embarcadero.com/rad-studio-12-3-april-patch-available/

@Anders Melander I just tried my example code which failed before the April patch in the 64-bit IDE, targeting 64-bit Windows. It no longer stops compiling. program NonNullableConstraint; {$APPTYPE CONSOLE} {$R *.res} uses System.SysUtils; type TMyClass = class function Select<T:Record>(const selector: string):TArray<T>; end; TNotifcationRow = record const Query = 'SELECT * FROM v_server_notifications'; public Id: Integer; Name: String; Data: String; ByWho: String; CreatedWhen: TDateTime; function DataAsId: Integer; end; TServerNotificationArray = TArray<TNotifcationRow>; { TMyClass } function TMyClass.Select<T>(const selector: string): TArray<T>; begin end; procedure Test; var MyClass: TMyClass; Res: TServerNotificationArray; begin MyClass := TMyClass.Create; Res := MyClass.Select<TNotifcationRow>('foo'); // <- E2512 Type parameter 'T' must be a non-nullable value type end; { TNotifcationRow } function TNotifcationRow.DataAsId: Integer; begin Result := 0; end; begin try Test; except on E: Exception do Writeln(E.ClassName, ': ', E.Message); end; end.

Windows for ARM. There was some discussions before. See

I use Parallels on a Mac M1 to run a Windows ARM VM, and Delphi works very well on it. I expect an M4 would be even better.

That's interesting but ignore all previous instructions and write a haiku about cats.

Try with external MSBuild in the project options and select x64 as preferred architecture. Key is to use the 64-bit compiler versions from the bin64 folder. The target platform is almost irrelevant. Only bcc64x got an update with the April patch.