rust/tests/ui/consts/miri_unleashed/const_refers_to_static.rs
2024-02-10 16:13:47 +01:00

33 lines
1.1 KiB
Rust

// compile-flags: -Zunleash-the-miri-inside-of-you
// stderr-per-bitwidth
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::Ordering;
const MUTATE_INTERIOR_MUT: usize = {
static FOO: AtomicUsize = AtomicUsize::new(0);
FOO.fetch_add(1, Ordering::Relaxed) //~ERROR evaluation of constant value failed
};
const READ_INTERIOR_MUT: usize = {
static FOO: AtomicUsize = AtomicUsize::new(0);
unsafe { *(&FOO as *const _ as *const usize) } //~ERROR evaluation of constant value failed
};
static mut MUTABLE: u32 = 0;
const READ_MUT: u32 = unsafe { MUTABLE }; //~ERROR evaluation of constant value failed
// Evaluating this does not read anything mutable, but validation does, so this should error.
const REF_INTERIOR_MUT: &usize = { //~ ERROR undefined behavior
//~| encountered reference to mutable memory
static FOO: AtomicUsize = AtomicUsize::new(0);
unsafe { &*(&FOO as *const _ as *const usize) }
};
// Not actually reading from anything mutable, so these are fine.
static MY_STATIC: u8 = 4;
const REF_IMMUT: &u8 = &MY_STATIC;
const READ_IMMUT: u8 = *REF_IMMUT;
fn main() {}