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Auto merge of #54596 - mjbshaw:drop, r=RalfJung
Make core::mem::needs_drop a const fn This fixes #51929.
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Original file line number | Diff line number | Diff line change |
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// 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. | ||
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#![feature(const_needs_drop)] | ||
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use std::mem; | ||
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struct Trivial(u8, f32); | ||
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struct NonTrivial(u8, String); | ||
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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>(); | ||
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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>(); | ||
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fn main() { | ||
assert!(!CONST_U8); | ||
assert!(CONST_STRING); | ||
assert!(!CONST_TRIVIAL); | ||
assert!(CONST_NON_TRIVIAL); | ||
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assert!(!STATIC_U8); | ||
assert!(STATIC_STRING); | ||
assert!(!STATIC_TRIVIAL); | ||
assert!(STATIC_NON_TRIVIAL); | ||
} |
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