17 lines
649 B
Rust
17 lines
649 B
Rust
|
use std::ptr;
|
||
|
|
|
||
|
|
// This code should remain unsafe because of the two unsafe operations here,
|
||
|
|
// even if in a hypothetical future we deem all &raw (const|mut) *ptr exprs safe.
|
||
|
|
|
||
|
|
static mut BYTE: u8 = 0;
|
||
|
|
static mut BYTE_PTR: *mut u8 = ptr::addr_of_mut!(BYTE);
|
||
|
|
// An unsafe static's ident is a place expression in its own right, so despite the above being safe
|
||
|
|
// (it's fine to create raw refs to places!) the following derefs the ptr before creating its ref!
|
||
|
|
static mut DEREF_BYTE_PTR: *mut u8 = ptr::addr_of_mut!(*BYTE_PTR);
|
||
|
|
//~^ ERROR: use of mutable static
|
||
|
|
//~| ERROR: dereference of raw pointer
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let _ = unsafe { DEREF_BYTE_PTR };
|
||
|
|
}
|