0
我有一个功能,它的缩写版本可能看起来像:为什么Rust在读取循环后没有看到变量?
loop {
let mut changed = false;
for p in 0..sys.len() {
k = ...
if k == None { continue; }
// some stuff
for (v, _) in &key.0 {
// some stuff
loop {
if n == 2 {
changed = true;
} else if n % 2 == 0 {
changed = true;
} else if n >= 2 {
changed = true;
} else {
changed = true;
}
}
}
}
if !changed { return; }
}
你可以看到国旗在最后if语句访问。但我收到此警告消息:
warning: value assigned to `changed` is never read
202 | changed = true;
| ^^^^^^^
|
= note: #[warn(unused_assignments)] on by default
而且我没有收到其他警告/错误消息。为什么是这样?
漂亮的智能编译器 – Malice