mirror of https://github.com/rust-lang/rust
27 lines
956 B
Rust
27 lines
956 B
Rust
//@ check-pass
|
|
use std::ptr;
|
|
|
|
// see https://github.com/rust-lang/rust/issues/125833
|
|
// notionally, taking the address of an extern static is a safe operation,
|
|
// as we only point at it instead of generating a true reference to it
|
|
|
|
// it may potentially induce linker errors, but the safety of that is not about taking addresses!
|
|
// any safety obligation of the extern static's correctness in declaration is on the extern itself,
|
|
// see RFC 3484 for more on that: https://rust-lang.github.io/rfcs/3484-unsafe-extern-blocks.html
|
|
|
|
extern "C" {
|
|
static THERE: u8;
|
|
static mut SOMEWHERE: u8;
|
|
}
|
|
|
|
fn main() {
|
|
let ptr2there = ptr::addr_of!(THERE);
|
|
let ptr2somewhere = ptr::addr_of!(SOMEWHERE);
|
|
let ptr2somewhere = ptr::addr_of_mut!(SOMEWHERE);
|
|
|
|
// testing both addr_of and the expression it directly expands to
|
|
let raw2there = &raw const THERE;
|
|
let raw2somewhere = &raw const SOMEWHERE;
|
|
let raw2somewhere = &raw mut SOMEWHERE;
|
|
}
|