Lazy in racket

How2lazy in DrRacket?

There's the lazy library, but it's not functional, i.e. I define a to be 1, define b as a + a, force b, it gives 2, but then I force set a to be 5, and it gives b as 2 again.

Any way around this?

>>14
Is there even ANY possible way
>>11,13
With that macro, ``b'' gets replaced with a literal (+ a 2).
A function {i is} a value, (+ a b) is just (+ #<variable> #<procedure>). Other than that, no, variables can hold only values.