106 lines
1.9 KiB
Rust
106 lines
1.9 KiB
Rust
#![feature(tool_lints)]
|
|
|
|
|
|
#![warn(clippy::map_clone)]
|
|
|
|
#![allow(clippy::clone_on_copy, unused)]
|
|
|
|
use std::ops::Deref;
|
|
|
|
fn map_clone_iter() {
|
|
let x = [1,2,3];
|
|
x.iter().map(|y| y.clone());
|
|
|
|
x.iter().map(|&y| y);
|
|
|
|
x.iter().map(|y| *y);
|
|
|
|
x.iter().map(|y| { y.clone() });
|
|
|
|
x.iter().map(|&y| { y });
|
|
|
|
x.iter().map(|y| { *y });
|
|
|
|
x.iter().map(Clone::clone);
|
|
|
|
}
|
|
|
|
fn map_clone_option() {
|
|
let x = Some(4);
|
|
x.as_ref().map(|y| y.clone());
|
|
|
|
x.as_ref().map(|&y| y);
|
|
|
|
x.as_ref().map(|y| *y);
|
|
|
|
}
|
|
|
|
fn not_linted_option() {
|
|
let x = Some(5);
|
|
|
|
// Not linted: other statements
|
|
x.as_ref().map(|y| {
|
|
println!("y: {}", y);
|
|
y.clone()
|
|
});
|
|
|
|
// Not linted: argument bindings
|
|
let x = Some((6, 7));
|
|
x.map(|(y, _)| y.clone());
|
|
|
|
// Not linted: cloning something else
|
|
x.map(|y| y.0.clone());
|
|
|
|
// Not linted: no dereferences
|
|
x.map(|y| y);
|
|
|
|
// Not linted: multiple dereferences
|
|
let _: Option<(i32, i32)> = x.as_ref().as_ref().map(|&&x| x);
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct Wrapper<T>(T);
|
|
impl<T> Wrapper<T> {
|
|
fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Wrapper<U> {
|
|
Wrapper(f(self.0))
|
|
}
|
|
}
|
|
|
|
fn map_clone_other() {
|
|
let eight = 8;
|
|
let x = Wrapper(&eight);
|
|
|
|
// Not linted: not a linted type
|
|
x.map(|y| y.clone());
|
|
x.map(|&y| y);
|
|
x.map(|y| *y);
|
|
}
|
|
|
|
#[derive(Copy, Clone)]
|
|
struct UnusualDeref;
|
|
static NINE: i32 = 9;
|
|
|
|
impl Deref for UnusualDeref {
|
|
type Target = i32;
|
|
fn deref(&self) -> &i32 { &NINE }
|
|
}
|
|
|
|
fn map_clone_deref() {
|
|
let x = Some(UnusualDeref);
|
|
let _: Option<UnusualDeref> = x.as_ref().map(|y| *y);
|
|
|
|
|
|
// Not linted: using deref conversion
|
|
let _: Option<i32> = x.map(|y| *y);
|
|
|
|
// Not linted: using regular deref but also deref conversion
|
|
let _: Option<i32> = x.as_ref().map(|y| **y);
|
|
}
|
|
|
|
// stuff that used to be a false positive
|
|
fn former_false_positive() {
|
|
vec![1].iter_mut().map(|x| *x); // #443
|
|
}
|
|
|
|
fn main() { }
|