rust/tests/ui/drop/dropck-eyepatch-manuallydrop.rs
2024-02-16 20:02:50 +00:00

23 lines
483 B
Rust

//@ check-pass
//! This test checks that dropck knows that ManuallyDrop does not drop its field.
#![feature(dropck_eyepatch)]
use std::mem::ManuallyDrop;
struct S<T>(ManuallyDrop<T>);
unsafe impl<#[may_dangle] T> Drop for S<T> {
fn drop(&mut self) {}
}
struct NonTrivialDrop<'a>(&'a str);
impl<'a> Drop for NonTrivialDrop<'a> {
fn drop(&mut self) {}
}
fn main() {
let s = String::from("string");
let _t = S(ManuallyDrop::new(NonTrivialDrop(&s)));
drop(s);
}