| #![crate_type = "lib"] |
| #![feature(no_core)] |
| #![feature(lang_items)] |
| #![no_core] |
| // { dg-options "-w" } |
| |
| #[lang = "sized"] |
| pub trait Sized {} |
| |
| #[lang = "clone"] |
| pub trait Clone: Sized { |
| fn clone(&self) -> Self; |
| } |
| |
| #[lang = "copy"] |
| pub trait Copy: Clone {} |
| |
| #[derive(Clone)] // { dg-error "derive may only be applied to structs, enums and unions" } |
| fn foo() {} |
| |
| #[derive(Clone)] // { dg-error "derive may only be applied to structs, enums and unions" } |
| trait Bar {} |
| |
| // Valid test: Derive Copy and Clone on a unit struct |
| #[derive(Copy, Clone)] |
| struct TupleStruct; |
| |
| // { dg-prune-output "could not resolve" } |
