mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-14 01:25:54 +00:00
19 lines
782 B
Rust
19 lines
782 B
Rust
//@ build-fail
|
|
//@ compile-flags: --crate-type lib
|
|
//@ only-32bit Layout computation rejects this layout for different reasons on 64-bit.
|
|
//@ error-pattern: too big for the current architecture
|
|
#![feature(core_intrinsics)]
|
|
#![allow(internal_features)]
|
|
|
|
// isize::MAX is fine, but with the padding for the unsized tail it is too big.
|
|
#[repr(C)]
|
|
pub struct Example([u8; isize::MAX as usize], [u16]);
|
|
|
|
// We guarantee that with length 0, `size_of_val_raw` (which calls the `size_of_val` intrinsic)
|
|
// is safe to call. The compiler aborts compilation if a length of 0 would overflow.
|
|
// So let's construct a case where length 0 just barely overflows, and ensure that
|
|
// does abort compilation.
|
|
pub fn check(x: *const Example) -> usize {
|
|
unsafe { std::intrinsics::size_of_val(x) }
|
|
}
|