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Why is this an issue?

  Functions should not leave their result uninitialized, as their return value will then be
  undefined.


  This also includes out parameters, which are designed to populate an uninitialized
  variable outside the routine.

How to fix it
For a function, ensure that Result is initialized by the end of every branch:
function GetWeapon(Ranged: Boolean): TWeapon;
begin
  if Ranged then begin
    Result := TBow.Create;
  end;
end;

function GetWeapon(Ranged: Boolean): TWeapon;
begin
  if Ranged then begin
    Result := TBow.Create;
  end
  else begin
    Result := TSword.Create;
  end;
end;

Ensure that all out parameters are initialized by the end of every branch:
procedure GetOutfit(PersonName: string; out Shirt: TShirt; out Pants: TPants);
begin
  if (PersonName <> '') then begin
    Shirt := GetShirt(PersonName);
    Pants := GetPants(PersonName);
  end;
end;

procedure GetOutfit(PersonName: string; out Shirt: TShirt; out Pants: TPants);
begin
  if (PersonName <> '') then begin
    Shirt := GetShirt(PersonName);
    Pants := GetPants(PersonName);
  end
  else begin
    Shirt := nil;
    Pants := nil;
  end;
end;

Resources

  
    
      RAD Studio documentation: Out Parameters