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Internal error 2012101001 with generic Tbar<_A> = type class

fpc 3.3.1 from early December 2023 Win 10 64 bit

program Project1;
type
  generic Tbar<_A> = type class
    f:_A;
  end;

  tabc = specialize TBar<integer>; // Internal error 2012101001

begin
end.
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