[AMPL 1813] Using variable solution in model expression

Hi,

I would like to write a constraint containing an expression with the
value of a variable from a prior solve.
I don't want to define a new parameter to transfer the solution to the
next solve, can I use user defined suffix for that?

For example:

suffix initial;

var X;

subject to test: X>=1+X.initial;
minize obj:X;

let X.initial := 0;
solve;
(>>X=1)
let X.initial := X.val;
solve;
(>>X=2)

This works on this simple example, but in a more complex model, using
user defined suffix inside model expression causes ampl to crash!

Thanks, Benoit.




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