| // Copyright 2018 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. |
| |
| #![feature(const_needs_drop)] |
| |
| use std::mem; |
| |
| struct Trivial(u8, f32); |
| |
| struct NonTrivial(u8, String); |
| |
| const CONST_U8: bool = mem::needs_drop::<u8>(); |
| const CONST_STRING: bool = mem::needs_drop::<String>(); |
| const CONST_TRIVIAL: bool = mem::needs_drop::<Trivial>(); |
| const CONST_NON_TRIVIAL: bool = mem::needs_drop::<NonTrivial>(); |
| |
| static STATIC_U8: bool = mem::needs_drop::<u8>(); |
| static STATIC_STRING: bool = mem::needs_drop::<String>(); |
| static STATIC_TRIVIAL: bool = mem::needs_drop::<Trivial>(); |
| static STATIC_NON_TRIVIAL: bool = mem::needs_drop::<NonTrivial>(); |
| |
| fn main() { |
| assert!(!CONST_U8); |
| assert!(CONST_STRING); |
| assert!(!CONST_TRIVIAL); |
| assert!(CONST_NON_TRIVIAL); |
| |
| assert!(!STATIC_U8); |
| assert!(STATIC_STRING); |
| assert!(!STATIC_TRIVIAL); |
| assert!(STATIC_NON_TRIVIAL); |
| } |