This error message occurs when you try to take the address of an expression or a constant.
program Produce; var I: Integer; PI: ^Integer; begin PI := Addr(1); end.
A constant like 1 does not have a memory address, so you cannot apply the operator or the Addr standard function to it.
program Solve; var I: Integer; PI: ^Integer; begin PI := Addr(I); end.
You need to make sure you take the address of variable.
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