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Fix memory leak in test "mem::uninit_write_slice_cloned_no_drop" #80123

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merged 2 commits into from
Dec 20, 2020
Merged

Fix memory leak in test "mem::uninit_write_slice_cloned_no_drop" #80123

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01f36c5
fix memory leak in test
beepster4096 Dec 17, 2020
28e0d2f
Fix unused import error on wasm
beepster4096 Dec 18, 2020
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16 changes: 11 additions & 5 deletions library/core/tests/mem.rs
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
use core::mem::*;

#[cfg(panic = "unwind")]
use std::rc::Rc;

#[test]
Expand Down Expand Up @@ -250,14 +251,19 @@ fn uninit_write_slice_cloned_mid_panic() {

#[test]
fn uninit_write_slice_cloned_no_drop() {
let rc = Rc::new(());
#[derive(Clone)]
struct Bomb;

impl Drop for Bomb {
fn drop(&mut self) {
panic!("dropped a bomb! kaboom")
}
}

let mut dst = [MaybeUninit::uninit()];
let src = [rc.clone()];
let src = [Bomb];

MaybeUninit::write_slice_cloned(&mut dst, &src);

drop(src);

assert_eq!(Rc::strong_count(&rc), 2);
forget(src);
}