why does optimization removes overflow checks?
consider below testcase
$cat test.rs
fn fibonacci(n: u32) -> u32 {
let mut f:u32 = 0;
let mut s:u32 = 1;
let mut next: u32 =f+s;
for _ in 1..n {
f = s;
s= next;
next=f+s;
}
next
}
fn main() {
println!("{}",fibonacci(100));
}
$rustc test.rs -C opt-level=1
$./test
2425370821
$rustc test.rs -C opt-level=0
$./test
thread 'main' panicked at 'attempt to add with overflow', p11.rs:11:7
note: run with `RUST_BACKTRACE=1` environment variable to display a
backtrace.
./Kamlesh
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