Why is this an issue?

Omitting the type for inline loop variable declarations has a few downsides, including:

The lack of type information can make code harder to follow and understand.
Type inference can lead to unexpected types being inferred, particularly for integers.
Wrapper types that rely on implicit type conversions will not have those conversions invoked.

How to fix it

Explicitly specify the loop variable's type:

procedure Example;
begin
  for var I := 1 to 100 do begin
    Continue;
  end;
end;

procedure Example;
begin
  for var I: Integer := 1 to 100 do begin
    Continue;
  end;
end;