rust/tests/ui/self/self-in-mut-slot-immediate-value.rs
2024-02-16 20:02:50 +00:00

24 lines
388 B
Rust

//@ run-pass
// Assert that `mut self` on an immediate value doesn't
// allow mutating the original - issue #10615.
#[derive(Copy, Clone)]
struct Value {
n: isize
}
impl Value {
fn squared(mut self) -> Value {
self.n *= self.n;
self
}
}
pub fn main() {
let x = Value { n: 3 };
let y = x.squared();
assert_eq!(x.n, 3);
assert_eq!(y.n, 9);
}