110 lines
1.9 KiB
Rust
110 lines
1.9 KiB
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.
|
|
|
|
|
|
|
|
|
|
#![feature(untagged_unions)]
|
|
|
|
#![allow(dead_code)]
|
|
#![warn(clippy::expl_impl_clone_on_copy)]
|
|
|
|
use std::hash::{Hash, Hasher};
|
|
|
|
#[derive(PartialEq, Hash)]
|
|
struct Foo;
|
|
|
|
impl PartialEq<u64> for Foo {
|
|
fn eq(&self, _: &u64) -> bool { true }
|
|
}
|
|
|
|
#[derive(Hash)]
|
|
struct Bar;
|
|
|
|
impl PartialEq for Bar {
|
|
fn eq(&self, _: &Bar) -> bool { true }
|
|
}
|
|
|
|
#[derive(Hash)]
|
|
struct Baz;
|
|
|
|
impl PartialEq<Baz> for Baz {
|
|
fn eq(&self, _: &Baz) -> bool { true }
|
|
}
|
|
|
|
#[derive(PartialEq)]
|
|
struct Bah;
|
|
|
|
impl Hash for Bah {
|
|
fn hash<H: Hasher>(&self, _: &mut H) {}
|
|
}
|
|
|
|
#[derive(Copy)]
|
|
struct Qux;
|
|
|
|
impl Clone for Qux {
|
|
fn clone(&self) -> Self { Qux }
|
|
}
|
|
|
|
// looks like unions don't support deriving Clone for now
|
|
#[derive(Copy)]
|
|
union Union {
|
|
a: u8,
|
|
}
|
|
|
|
impl Clone for Union {
|
|
fn clone(&self) -> Self {
|
|
Union {
|
|
a: 42,
|
|
}
|
|
}
|
|
}
|
|
|
|
// See #666
|
|
#[derive(Copy)]
|
|
struct Lt<'a> {
|
|
a: &'a u8,
|
|
}
|
|
|
|
impl<'a> Clone for Lt<'a> {
|
|
fn clone(&self) -> Self { unimplemented!() }
|
|
}
|
|
|
|
// Ok, `Clone` cannot be derived because of the big array
|
|
#[derive(Copy)]
|
|
struct BigArray {
|
|
a: [u8; 65],
|
|
}
|
|
|
|
impl Clone for BigArray {
|
|
fn clone(&self) -> Self { unimplemented!() }
|
|
}
|
|
|
|
// Ok, function pointers are not always Clone
|
|
#[derive(Copy)]
|
|
struct FnPtr {
|
|
a: fn() -> !,
|
|
}
|
|
|
|
impl Clone for FnPtr {
|
|
fn clone(&self) -> Self { unimplemented!() }
|
|
}
|
|
|
|
// Ok, generics
|
|
#[derive(Copy)]
|
|
struct Generic<T> {
|
|
a: T,
|
|
}
|
|
|
|
impl<T> Clone for Generic<T> {
|
|
fn clone(&self) -> Self { unimplemented!() }
|
|
}
|
|
|
|
fn main() {}
|