rust-clippy/tests/ui/comparison_to_empty.rs

36 lines
764 B
Rust

#![warn(clippy::comparison_to_empty)]
#![allow(clippy::borrow_deref_ref, clippy::needless_if, clippy::useless_vec)]
#![feature(let_chains)]
fn main() {
// Disallow comparisons to empty
let s = String::new();
let _ = s == "";
let _ = s != "";
let v = vec![0];
let _ = v == [];
let _ = v != [];
if let [] = &*v {}
let s = [0].as_slice();
if let [] = s {}
if let [] = &*s {}
if let [] = &*s
&& s == []
{}
// Allow comparisons to non-empty
let s = String::new();
let _ = s == " ";
let _ = s != " ";
let v = vec![0];
let _ = v == [0];
let _ = v != [0];
if let [0] = &*v {}
let s = [0].as_slice();
if let [0] = s {}
if let [0] = &*s
&& s == [0]
{}
}