Datasets:
File size: 1,135 Bytes
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 48 49 50 51 52 53 54 55 56 57 | use vstd::prelude::*;
fn main() {}
verus!{
spec fn f1_is_ascii_digit_spec(c: char) -> bool {
c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6' || c == '7'
|| c == '8' || c == '9'
}
fn f1_is_ascii_digit(c: char) -> (r: bool)
{
c == '0' || c == '1' || c == '2' || c == '3' || c == '4' || c == '5' || c == '6' || c == '7'
|| c == '8' || c == '9'
}
spec fn f1_all_digits_spec(s: Seq<char>) -> bool {
forall|i: nat| #![auto] i < s.len() ==> f1_is_ascii_digit_spec(s[i as int])
}
fn f1_all_digits(s: String) -> (result: bool)
requires
s.is_ascii(),
{
let mut i = 0;
while i < s.as_str().unicode_len()
{
if !f1_is_ascii_digit(s.as_str().get_char(i)) {
return false;
}
i = i + 1;
}
true
}
spec fn step1(__hp0: String, outp: bool) -> bool {
(f1_all_digits_spec(__hp0@) == outp)
}
fn chain_driver(s: String) -> (r_final: bool)
requires
s.is_ascii(),
ensures
step1(s, r_final),
{
let x1 = f1_all_digits(s);
proof {
assert(step1(s, x1));
}
x1
}
} // verus!
|