rust-clippy/tests/ui/trait_duplication_in_bounds.rs

#![deny(clippy::trait_duplication_in_bounds)]

use std::collections::BTreeMap;
use std::ops::{Add, AddAssign, Div, DivAssign, Mul, MulAssign, Sub, SubAssign};

fn bad_foo<T: Clone + Default, Z: Copy>(arg0: T, arg1: Z)
where
    T: Clone,
    T: Default,
{
    unimplemented!();
}

fn good_bar<T: Clone + Default>(arg: T) {
    unimplemented!();
}

fn good_foo<T>(arg: T)
where
    T: Clone + Default,
{
    unimplemented!();
}

fn good_foobar<T: Default>(arg: T)
where
    T: Clone,
{
    unimplemented!();
}

trait T: Default {
    fn f()
    where
        Self: Default;
}

trait U: Default {
    fn f()
    where
        Self: Clone;
}

trait ZZ: Default {
    fn g();
    fn h();
    fn f()
    where
        Self: Default + Clone;
}

trait BadTrait: Default + Clone {
    fn f()
    where
        Self: Default + Clone;
    fn g()
    where
        Self: Default;
    fn h()
    where
        Self: Copy;
}

#[derive(Default, Clone)]
struct Life;

impl T for Life {
    // this should not warn
    fn f() {}
}

impl U for Life {
    // this should not warn
    fn f() {}
}

// should not warn
trait Iter: Iterator {
    fn into_group_btreemap<K, V>(self) -> BTreeMap<K, Vec<V>>
    where
        Self: Iterator<Item = (K, V)> + Sized,
        K: Ord + Eq,
    {
        unimplemented!();
    }
}

struct Foo;

trait FooIter: Iterator<Item = Foo> {
    fn bar()
    where
        Self: Iterator<Item = Foo>,
    {
    }
}

// This should not lint
fn impl_trait(_: impl AsRef<str>, _: impl AsRef<str>) {}

fn main() {}