rust/tests/ui/declare_interior_mutable_const/others.rs

#![warn(clippy::declare_interior_mutable_const)]

use std::borrow::Cow;
use std::cell::Cell;
use std::fmt::Display;
use std::ptr;
use std::sync::Once;
use std::sync::atomic::AtomicUsize;

const ATOMIC: AtomicUsize = AtomicUsize::new(5); //~ ERROR: interior mutable
const CELL: Cell<usize> = Cell::new(6); //~ ERROR: interior mutable
const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7);
//~^ ERROR: interior mutable

macro_rules! declare_const {
    ($name:ident: $ty:ty = $e:expr) => {
        const $name: $ty = $e;
        //~^ ERROR: interior mutable
    };
}
declare_const!(_ONCE: Once = Once::new());

// const ATOMIC_REF: &AtomicUsize = &AtomicUsize::new(7); // This will simply trigger E0492.

const INTEGER: u8 = 8;
const STRING: String = String::new();
const STR: &str = "012345";
const COW: Cow<str> = Cow::Borrowed("abcdef");
// note: a const item of Cow is used in the `postgres` package.

const NO_ANN: &dyn Display = &70;

static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING);
// there should be no lints on the line above line

mod issue_8493 {
    use std::cell::Cell;

    thread_local! {
        static _BAR: Cell<i32> = const { Cell::new(0) };
    }

    macro_rules! issue_8493 {
        () => {
            const _BAZ: Cell<usize> = Cell::new(0);
            static _FOOBAR: () = {
                thread_local! {
                    static _VAR: Cell<i32> = const { Cell::new(0) };
                }
            };
        };
    }

    issue_8493!();
}

#[repr(C, align(8))]
struct NoAtomic(usize);
#[repr(C, align(8))]
struct WithAtomic(AtomicUsize);

const fn with_non_null() -> *const WithAtomic {
    const NO_ATOMIC: NoAtomic = NoAtomic(0);
    (&NO_ATOMIC as *const NoAtomic).cast()
}
const WITH_ATOMIC: *const WithAtomic = with_non_null();

struct Generic<T>(T);
impl<T> Generic<T> {
    const RAW_POINTER: *const Cell<T> = ptr::null();
}

fn main() {}