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X1012 Constant expression violates subrange bounds (Delphi)

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This error message occurs when the compiler can determine that a constant is outside the legal range. For example, if you assign a value to an integer variable that is higher than MaxInt, you trigger this error.

Subranges Example

This can occur for instance if you assign a constant to a variable of subrange type.

The following example code triggers this error message:

program Produce;
var
  Digit: 1..9;
begin
  Digit := 0;
end.

To fix this issue, you must either include the assigned value in the range:

program Solve;
var
  Digit: 0..9;
begin
  Digit := 0;
end.

Alternatively, change the assignment so that the assigned value is within the legal range:

program Solve;
var
  Digit: 1..9;
begin
  Digit := 1;
end.
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