rust-clippy/tests/ui/fn_null_check.rs

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#![allow(unused)]
#![warn(clippy::fn_null_check)]
#![allow(clippy::cmp_null)]
#![allow(clippy::ptr_eq)]
#![allow(clippy::zero_ptr)]
pub const ZPTR: *const () = 0 as *const _;
pub const NOT_ZPTR: *const () = 1 as *const _;
fn main() {
let fn_ptr = main;
if (fn_ptr as *mut ()).is_null() {}
if (fn_ptr as *const u8).is_null() {}
if (fn_ptr as *const ()) == std::ptr::null() {}
if (fn_ptr as *const ()) == (0 as *const ()) {}
if (fn_ptr as *const ()) == ZPTR {}
// no lint
if (fn_ptr as *const ()) == NOT_ZPTR {}
}