49 lines
1.3 KiB
Rust
49 lines
1.3 KiB
Rust
// check-pass
|
|
//! The presence of an `align(X)` annotation must be accounted for.
|
|
|
|
#![crate_type = "lib"]
|
|
#![feature(transmutability)]
|
|
#![allow(dead_code, incomplete_features, non_camel_case_types)]
|
|
|
|
mod assert {
|
|
use std::mem::{Assume, BikeshedIntrinsicFrom};
|
|
pub struct Context;
|
|
|
|
pub fn is_maybe_transmutable<Src, Dst>()
|
|
where
|
|
Dst: BikeshedIntrinsicFrom<Src, Context, {
|
|
Assume {
|
|
alignment: true,
|
|
lifetimes: true,
|
|
safety: true,
|
|
validity: true,
|
|
}
|
|
}>
|
|
{}
|
|
}
|
|
|
|
fn should_pad_explicitly_packed_field() {
|
|
#[derive(Clone, Copy)] #[repr(u8)] enum V0u8 { V = 0 }
|
|
#[derive(Clone, Copy)] #[repr(u8)] enum V1u8 { V = 1 }
|
|
#[derive(Clone, Copy)] #[repr(u8)] enum V2u8 { V = 2 }
|
|
#[derive(Clone, Copy)] #[repr(u32)] enum V3u32 { V = 3 }
|
|
|
|
#[repr(C)]
|
|
pub union Uninit {
|
|
a: (),
|
|
b: V1u8,
|
|
}
|
|
|
|
#[repr(C, packed(2))]
|
|
pub union Packed {
|
|
a: [V3u32; 0],
|
|
b: V0u8,
|
|
}
|
|
|
|
#[repr(C)] struct ImplicitlyPadded(Packed, V2u8);
|
|
#[repr(C)] struct ExplicitlyPadded(V0u8, Uninit, V2u8);
|
|
|
|
assert::is_maybe_transmutable::<ImplicitlyPadded, ExplicitlyPadded>();
|
|
assert::is_maybe_transmutable::<ExplicitlyPadded, ImplicitlyPadded>();
|
|
}
|