On Sun, Apr 18, 2021 at 09:05:11AM +0200, Dominik Pantůček wrote: ... ... > > I would really like to be able to reason about the Integer bounds (and > therefore signs) dynamically. So that when you have something like: > > (: square (-> Fixnum Nonnegative-Fixnum)) > (define (square x) > (fx* x x)) > > You will get something better than:
> > multiplication.rkt:7:2: Type Checker: type mismatch > expected: Nonnegative-Fixnum > given: Fixnum > in: (fx* x x) > > I will look into the refinements implementation to see what are the > current limits and what the future possibilities might be. Reading the documentation you link to, it seems that the problem is that (fx* x x) is not linear in x. It says that it can reason only about linear expressions. This is a quadratic form. -- hendrik ... ... -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/20210419113103.c4fupxvl6ieb3uub%40topoi.pooq.com.
