src/tools/clippy/tests/ui/methods.rs

#![warn(clippy::filter_next, clippy::new_ret_no_self)]

use std::collections::{BTreeMap, HashMap, HashSet, VecDeque};
use std::ops::Mul;
use std::rc::{self, Rc};
use std::sync::{self, Arc};

struct Lt<'a> {
    foo: &'a u32,
}

impl<'a> Lt<'a> {
    // The lifetime is different, but that’s irrelevant; see issue #734.
    #[allow(clippy::needless_lifetimes)]
    pub fn new<'b>(s: &'b str) -> Lt<'b> {
        unimplemented!()
    }
}

struct Lt2<'a> {
    foo: &'a u32,
}

impl<'a> Lt2<'a> {
    // The lifetime is different, but that’s irrelevant; see issue #734.
    pub fn new(s: &str) -> Lt2<'_> {
        unimplemented!()
    }
}

struct Lt3<'a> {
    foo: &'a u32,
}

impl<'a> Lt3<'a> {
    // The lifetime is different, but that’s irrelevant; see issue #734.
    pub fn new() -> Lt3<'static> {
        unimplemented!()
    }
}

#[derive(Clone, Copy)]
struct U;

impl U {
    fn new() -> Self {
        U
    }
    // Ok because `U` is `Copy`.
    fn to_something(self) -> u32 {
        0
    }
}

struct V<T> {
    _dummy: T,
}

impl<T> V<T> {
    fn new() -> Option<V<T>> {
        None
    }
}

struct AsyncNew;

impl AsyncNew {
    async fn new() -> Option<Self> {
        None
    }
}

struct BadNew;

impl BadNew {
    fn new() -> i32 {
        //~^ new_ret_no_self
        0
    }
}

struct T;

impl Mul<T> for T {
    type Output = T;
    // No error, obviously.
    fn mul(self, other: T) -> T {
        self
    }
}

fn main() {}