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rust-clippy/tests/ui/vtable_address_comparisons.rs

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2020-03-12 00:00:00 +00:00
use std::fmt::Debug;
use std::ptr;
use std::rc::Rc;
use std::sync::Arc;
#[warn(clippy::vtable_address_comparisons)]
fn main() {
let a: *const dyn Debug = &1 as &dyn Debug;
let b: *const dyn Debug = &1 as &dyn Debug;
// These should fail:
let _ = a == b;
let _ = a != b;
let _ = a < b;
let _ = a <= b;
let _ = a > b;
let _ = a >= b;
ptr::eq(a, b);
let a = &1 as &dyn Debug;
let b = &1 as &dyn Debug;
ptr::eq(a, b);
let a: Rc<dyn Debug> = Rc::new(1);
Rc::ptr_eq(&a, &a);
let a: Arc<dyn Debug> = Arc::new(1);
Arc::ptr_eq(&a, &a);
// These should be fine:
let a = &1;
ptr::eq(a, a);
let a = Rc::new(1);
Rc::ptr_eq(&a, &a);
let a = Arc::new(1);
Arc::ptr_eq(&a, &a);
let a: &[u8] = b"";
ptr::eq(a, a);
}