rust-clippy/tests/ui/temporary_assignment.rs
2018-10-11 12:16:22 +02:00

46 lines
1,015 B
Rust

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#![warn(clippy::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);
Struct { field: 0 }.field = 1;
(0, 0).0 = 1;
// no error
s.field = 1;
t.0 = 1;
Wrapper { inner: &mut s }.field = 1;
}