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X1019 For loop control variable must be simple local variable (Delphi)

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Go Up to Error and Warning Messages (Delphi)

This error message is given when the control variable of a for statement is not a simple variable (but a component of a record, for instance), or if it is not local to the procedure containing the for statement.

For backward compatibility reasons, it is legal to use a global variable as the control variable - the compiler gives a warning in this case. Note that using a local variable will also generate more efficient code.


program Produce;

var
  I: Integer;
  A: array [0..9] of Integer;

procedure Init;
begin
  for I := Low(A) to High(a) do  (*<-- Warning given here*)
    A[I] := 0;
end;

begin
  Init;
end.
	program Solve;
var
  A: array [0..9] of Integer;

procedure Init;
var
  I: Integer;
begin
  for I := Low(A) to High(a) do
    A[I] := 0;
end;

begin
  Init;
end.
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