E2553 Class type constraint cannot be specified more than once (Delphi)

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This occurs when trying to specify the type constraint for the generic type more than once.

program E2553;
 
{$APPTYPE CONSOLE}
 
uses
  SysUtils;
 
type
  TBaseClass = class
  end;
 
  TNewClass = class(TBaseClass)
  end;
 
  TTestClass<TC: TBaseClass, TNewClass> = class //E2553
 
  end;
begin