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E2563 Specified interface type is not declared (Object Pascal)

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This occurs when you define an interface and in the inheritance you use different type restrictions between the inheritance expression and the methods you implement.


program E2563;
 
{$APPTYPE CONSOLE}
 
uses
  SysUtils;
 
type
  IMyIntf<T> = interface
    procedure IProc(A: T);
  end;
 
  TClass = class(TInterfacedObject, IMyIntf<String>) //E2563
    procedure IMyIntf<Integer>.IProc; //E2563  ImyIntf<Integer> not defined 
                                             // You should use either String or, in the inheritance expression, use class(TInterfacedObject, IMyIntf<Integer>)
  end;
 
begin
 
end.
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