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c62beea | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | use vstd::prelude::*;
fn main() {}
verus!{
fn f1_element_wise_subtract(arr1: &Vec<i32>, arr2: &Vec<i32>) -> (result: Vec<i32>)
requires
arr1.len() == arr2.len(),
forall|i: int|
(0 <= i < arr1.len()) ==> (i32::MIN <= #[trigger] (arr1[i] - arr2[i]) <= i32::MAX),
{
let mut output_arr = Vec::with_capacity(arr1.len());
let mut index = 0;
while index < arr1.len()
{
output_arr.push((arr1[index] - arr2[index]));
index += 1;
}
output_arr
}
spec fn step1(__hp0: Seq<i32>, __hp1: Seq<i32>, outp: Seq<i32>) -> bool {
(outp.len() == __hp0.len())
&& (forall|i: int|
0 <= i < outp.len() ==> #[trigger] outp[i] == #[trigger] (__hp0[i] - __hp1[i]))
}
fn chain_driver(arr1: &Vec<i32>, arr2: &Vec<i32>) -> (r_final: Vec<i32>)
requires
arr1.len() == arr2.len(),
forall|i: int|
(0 <= i < arr1.len()) ==> (i32::MIN <= #[trigger] (arr1[i] - arr2[i]) <= i32::MAX),
ensures
step1(arr1@, arr2@, r_final@),
{
let x1 = f1_element_wise_subtract(arr1, arr2);
proof {
assert(step1(arr1@, arr2@, x1@));
}
x1
}
} // verus!
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