| // Copyright 2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // 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. |
| |
| // Check we reject structs that mix a `Drop` impl with `#[repr(C)]`. |
| // |
| // As a special case, also check that we do not warn on such structs |
| // if they also are declared with `#[unsafe_no_drop_flag]` |
| |
| #![feature(unsafe_no_drop_flag)] |
| #![deny(drop_with_repr_extern)] |
| //~^ NOTE lint level defined here |
| //~| NOTE lint level defined here |
| |
| #[repr(C)] struct As { x: Box<i8> } |
| #[repr(C)] enum Ae { Ae(Box<i8>), _None } |
| |
| struct Bs { x: Box<i8> } |
| enum Be { Be(Box<i8>), _None } |
| |
| #[repr(C)] struct Cs { x: Box<i8> } |
| //~^ NOTE the `#[repr(C)]` attribute is attached here |
| |
| impl Drop for Cs { fn drop(&mut self) { } } |
| //~^ ERROR implementing Drop adds hidden state to types, possibly conflicting with `#[repr(C)]` |
| |
| #[repr(C)] enum Ce { Ce(Box<i8>), _None } |
| //~^ NOTE the `#[repr(C)]` attribute is attached here |
| |
| impl Drop for Ce { fn drop(&mut self) { } } |
| //~^ ERROR implementing Drop adds hidden state to types, possibly conflicting with `#[repr(C)]` |
| |
| #[unsafe_no_drop_flag] |
| #[repr(C)] struct Ds { x: Box<i8> } |
| |
| impl Drop for Ds { fn drop(&mut self) { } } |
| |
| #[unsafe_no_drop_flag] |
| #[repr(C)] enum De { De(Box<i8>), _None } |
| |
| impl Drop for De { fn drop(&mut self) { } } |
| |
| fn main() { |
| let a = As { x: Box::new(3) }; |
| let b = Bs { x: Box::new(3) }; |
| let c = Cs { x: Box::new(3) }; |
| let d = Ds { x: Box::new(3) }; |
| |
| println!("{:?}", (*a.x, *b.x, *c.x, *d.x)); |
| |
| let _a = Ae::Ae(Box::new(3)); |
| let _b = Be::Be(Box::new(3)); |
| let _c = Ce::Ce(Box::new(3)); |
| let _d = De::De(Box::new(3)); |
| } |