19 lines
602 B
Rust
19 lines
602 B
Rust
// A callee may not read the destination of our `&mut` without
|
|
// us noticing.
|
|
|
|
fn main() {
|
|
let mut x = 15;
|
|
let xraw = &mut x as *mut _;
|
|
let xref = unsafe { &mut *xraw }; // derived from raw, so using raw is still okay...
|
|
callee(xraw);
|
|
let _val = *xref; // ...but any use of raw will invalidate our ref.
|
|
//~^ ERROR: mutable reference with non-reactivatable tag
|
|
}
|
|
|
|
fn callee(xraw: *mut i32) {
|
|
// We are a bit sneaky: We first create a shared ref, exploiting the reborrowing rules,
|
|
// and then we read through that.
|
|
let shr = unsafe { &*xraw };
|
|
let _val = *shr;
|
|
}
|