| // ignore-tidy-linelength |
| #![feature(const_transmute)] |
| #![allow(const_err, invalid_value)] // make sure we cannot allow away the errors tested here |
| |
| use std::mem; |
| |
| const UNALIGNED: &u16 = unsafe { mem::transmute(&[0u8; 4]) }; |
| //~^ ERROR it is undefined behavior to use this value |
| //~^^ type validation failed: encountered unaligned reference (required 2 byte alignment but found 1) |
| |
| const NULL: &u16 = unsafe { mem::transmute(0usize) }; |
| //~^ ERROR it is undefined behavior to use this value |
| |
| // It is very important that we reject this: We do promote `&(4 * REF_AS_USIZE)`, |
| // but that would fail to compile; so we ended up breaking user code that would |
| // have worked fine had we not promoted. |
| const REF_AS_USIZE: usize = unsafe { mem::transmute(&0) }; |
| //~^ ERROR it is undefined behavior to use this value |
| |
| const REF_AS_USIZE_SLICE: &[usize] = &[unsafe { mem::transmute(&0) }]; |
| //~^ ERROR it is undefined behavior to use this value |
| |
| const USIZE_AS_REF: &'static u8 = unsafe { mem::transmute(1337usize) }; |
| //~^ ERROR it is undefined behavior to use this value |
| |
| fn main() {} |
