rust/tests/ui/temporary_assignment.rs

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#![feature(plugin)]
#![plugin(clippy)]
#![deny(temporary_assignment)]
use std::ops::{Deref, DerefMut};
struct Struct {
field: i32
}
struct Wrapper<'a> {
inner: &'a mut Struct
}
impl<'a> Deref for Wrapper<'a> {
type Target = Struct;
fn deref(&self) -> &Struct { self.inner }
}
impl<'a> DerefMut for Wrapper<'a> {
fn deref_mut(&mut self) -> &mut Struct { self.inner }
}
fn main() {
let mut s = Struct { field: 0 };
let mut t = (0, 0);
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Struct { field: 0 }.field = 1;
(0, 0).0 = 1;
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// no error
s.field = 1;
t.0 = 1;
Wrapper { inner: &mut s }.field = 1;
}