Comments (1)
This has been fixed.
The loop invariant is now enforced only in the loop body, after the evaluation of the loop condition. So, the invariant has to be adapted. Working program:
extern crate prusti_contracts;
#[pure]
#[requires="n <= 999999"]
fn closed_form(n: u64) -> u64 {
n * (n + 1) / 2
}
#[requires="n <= 999999"]
#[ensures = "result == closed_form(n)"]
fn iter_form(n: u64) -> u64 {
let mut i = 1;
let mut acc = 0;
#[invariant = "1 <= i && i <= n"] // OLD: `1 <= i && i <= n + 1`
#[invariant = "acc == closed_form(i - 1)"]
while i <= n {
acc += i;
i += 1;
}
acc
}
from prusti-dev.
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