rust-clippy/tests/ui/partialeq_to_none.rs

75 lines
1.3 KiB
Rust

//@run-rustfix
#![warn(clippy::partialeq_to_none)]
#![allow(clippy::eq_op, clippy::needless_if)]
struct Foobar;
impl PartialEq<Option<()>> for Foobar {
fn eq(&self, _: &Option<()>) -> bool {
false
}
}
#[allow(dead_code)]
fn foo(f: Option<u32>) -> &'static str {
if f != None { "yay" } else { "nay" }
}
fn foobar() -> Option<()> {
None
}
fn bar() -> Result<(), ()> {
Ok(())
}
fn optref() -> &'static &'static Option<()> {
&&None
}
pub fn macro_expansion() {
macro_rules! foo {
() => {
None::<()>
};
}
let _ = foobar() == foo!();
let _ = foo!() == foobar();
let _ = foo!() == foo!();
}
fn main() {
let x = Some(0);
let _ = x == None;
let _ = x != None;
let _ = None == x;
let _ = None != x;
if foobar() == None {}
if bar().ok() != None {}
let _ = Some(1 + 2) != None;
let _ = { Some(0) } == None;
let _ = {
/*
This comment runs long
*/
Some(1)
} != None;
// Should not trigger, as `Foobar` is not an `Option` and has no `is_none`
let _ = Foobar == None;
let _ = optref() == &&None;
let _ = &&None != optref();
let _ = **optref() == None;
let _ = &None != *optref();
let x = Box::new(Option::<()>::None);
let _ = None != *x;
}