src/tools/clippy/tests/ui/transmuting_null.rs

#![allow(dead_code)]
#![warn(clippy::transmuting_null)]
#![allow(clippy::zero_ptr)]
#![allow(clippy::transmute_ptr_to_ref)]
#![allow(clippy::eq_op, clippy::missing_transmute_annotations)]
#![allow(clippy::manual_dangling_ptr)]

// Easy to lint because these only span one line.
fn one_liners() {
    unsafe {
        let _: &u64 = std::mem::transmute(0 as *const u64);
        //~^ transmuting_null

        let _: &u64 = std::mem::transmute(std::ptr::null::<u64>());
        //~^ transmuting_null
    }
}

pub const ZPTR: *const usize = 0 as *const _;
pub const NOT_ZPTR: *const usize = 1 as *const _;

fn transmute_const() {
    unsafe {
        // Should raise a lint.
        let _: &u64 = std::mem::transmute(ZPTR);
        //~^ transmuting_null

        // Should NOT raise a lint.
        let _: &u64 = std::mem::transmute(NOT_ZPTR);
    }
}

fn transmute_const_int() {
    unsafe {
        let _: &u64 = std::mem::transmute(u64::MIN as *const u64);
        //~^ transmuting_null
    }
}

fn transumute_single_expr_blocks() {
    unsafe {
        let _: &u64 = std::mem::transmute({ 0 as *const u64 });
        //~^ transmuting_null

        let _: &u64 = std::mem::transmute(const { u64::MIN as *const u64 });
        //~^ transmuting_null
    }
}

fn transmute_pointer_creators() {
    unsafe {
        let _: &u64 = std::mem::transmute(std::ptr::without_provenance::<u64>(0));
        //~^ transmuting_null

        let _: &u64 = std::mem::transmute(std::ptr::without_provenance_mut::<u64>(0));
        //~^ transmuting_null
    }
}

fn main() {}