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Add tests for libstd types

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This commit is contained in:
Oli Scherer 2022-07-08 14:28:19 +00:00
parent 8d9f609d0d
commit 4bfba76a3d
1 changed files with 17 additions and 5 deletions
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22
src/test/ui/layout/unsafe-cell-hides-niche.rs
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@ -5,9 +5,10 @@
// run-pass // run-pass
use std::cell::UnsafeCell; use std::cell::{UnsafeCell, RefCell, Cell};
use std::mem::size_of; use std::mem::size_of;
use std::num::NonZeroU32 as N32; use std::num::NonZeroU32 as N32;
use std::sync::{Mutex, RwLock};
struct Wrapper<T>(T); struct Wrapper<T>(T);
@ -18,12 +19,23 @@ struct NoNiche<T>(UnsafeCell<T>);
fn main() { fn main() {
assert_eq!(size_of::<Option<Wrapper<u32>>>(), 8); assert_eq!(size_of::<Option<Wrapper<u32>>>(), 8);
assert_eq!(size_of::<Option<Wrapper<N32>>>(), 4); assert_eq!(size_of::<Option<Wrapper<N32>>>(), 4); // (✓ niche opt)
assert_eq!(size_of::<Option<Transparent<u32>>>(), 8); assert_eq!(size_of::<Option<Transparent<u32>>>(), 8);
assert_eq!(size_of::<Option<Transparent<N32>>>(), 4); assert_eq!(size_of::<Option<Transparent<N32>>>(), 4); // (✓ niche opt)
assert_eq!(size_of::<Option<NoNiche<u32>>>(), 8); assert_eq!(size_of::<Option<NoNiche<u32>>>(), 8);
assert_eq!(size_of::<Option<NoNiche<N32>>>(), 8); assert_eq!(size_of::<Option<NoNiche<N32>>>(), 8); // (✗ niche opt)
assert_eq!(size_of::<Option<UnsafeCell<u32>>>(), 8); assert_eq!(size_of::<Option<UnsafeCell<u32>>>(), 8);
assert_eq!(size_of::<Option<UnsafeCell<N32>>>(), 8); assert_eq!(size_of::<Option<UnsafeCell<N32>>>(), 8); // (✗ niche opt)
assert_eq!(size_of::< UnsafeCell<&()> >(), 8);
assert_eq!(size_of::<Option<UnsafeCell<&()>>>(), 16); // (✗ niche opt)
assert_eq!(size_of::< Cell<&()> >(), 8);
assert_eq!(size_of::<Option< Cell<&()>>>(), 16); // (✗ niche opt)
assert_eq!(size_of::< RefCell<&()> >(), 16);
assert_eq!(size_of::<Option< RefCell<&()>>>(), 24); // (✗ niche opt)
assert_eq!(size_of::< RwLock<&()> >(), 24);
assert_eq!(size_of::<Option< RwLock<&()>>>(), 32); // (✗ niche opt)
assert_eq!(size_of::< Mutex<&()> >(), 16);
assert_eq!(size_of::<Option< Mutex<&()>>>(), 24); // (✗ niche opt)
} }