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W1009 Redeclaration of '%s' hides a member in the base class (Object Pascal)

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A property has been created in a class with the same name of a variable contained in one of the base classes. One possible, and not altogether apparent, reason for getting this error is that a new version of the base class hierarchy has been installed and it contains new member variables which have names identical to your properties' names. -W


(*$WARNINGS ON*)
program Produce;

  type
    Base = class
      v : integer;
    end;

    Derived = class (Base)
      ch : char;
      property v : char read ch write ch;
    end;

begin
end.

Derived.v overrides, and thus hides, Base.v; it will not be possible to access Base.v in any variable of type Derived without a typecast.


(*$WARNINGS ON*)
program Solve;
  type
    Base = class
      v : integer;
    end;

    Derived = class (Base)
      ch : char;
      property chV : char read ch write ch;
    end;

begin
end.

By changing the name of the property in the derived class, the error is alleviated.

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