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//@revisions: stack tree
//@[tree]compile-flags: -Zmiri-tree-borrows
#![feature(custom_mir, core_intrinsics)]
use std::intrinsics::mir::*;
pub struct S(i32);
#[custom_mir(dialect = "runtime", phase = "optimized")]
fn main() {
mir! {
let _unit: ();
{
let non_copy = S(42);
let ptr = std::ptr::addr_of_mut!(non_copy);
// Inside `callee`, the first argument and `*ptr` are basically
// aliasing places!
Call(_unit = callee(Move(*ptr), ptr), ReturnTo(after_call), UnwindContinue())
}
after_call = {
Return()
}
}
}
pub fn callee(x: S, ptr: *mut S) {
// With the setup above, if `x` is indeed moved in
// (i.e. we actually just get a pointer to the underlying storage),
// then writing to `ptr` will change the value stored in `x`!
unsafe { ptr.write(S(0)) };
//~[stack]^ ERROR: not granting access
//~[tree]| ERROR: /write access .* forbidden/
assert_eq!(x.0, 42);
}
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