rust/tests/ui/derive.rs

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#![feature(untagged_unions)]
#![allow(dead_code)]
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#![warn(clippy::expl_impl_clone_on_copy)]
#[derive(Copy)]
struct Qux;
impl Clone for Qux {
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fn clone(&self) -> Self {
Qux
}
}
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// looks like unions don't support deriving Clone for now
#[derive(Copy)]
union Union {
a: u8,
}
impl Clone for Union {
fn clone(&self) -> Self {
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Union { a: 42 }
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}
}
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// See #666
#[derive(Copy)]
struct Lt<'a> {
a: &'a u8,
}
impl<'a> Clone for Lt<'a> {
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fn clone(&self) -> Self {
unimplemented!()
}
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}
// Ok, `Clone` cannot be derived because of the big array
#[derive(Copy)]
struct BigArray {
a: [u8; 65],
}
impl Clone for BigArray {
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fn clone(&self) -> Self {
unimplemented!()
}
}
// Ok, function pointers are not always Clone
#[derive(Copy)]
struct FnPtr {
a: fn() -> !,
}
impl Clone for FnPtr {
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fn clone(&self) -> Self {
unimplemented!()
}
}
// Ok, generics
#[derive(Copy)]
struct Generic<T> {
a: T,
}
impl<T> Clone for Generic<T> {
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fn clone(&self) -> Self {
unimplemented!()
}
}
fn main() {}