rust-clippy/tests/ui/comparison_to_empty.fixed

36 lines
796 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.is_empty();
let _ = !s.is_empty();
let v = vec![0];
let _ = v.is_empty();
let _ = !v.is_empty();
if (*v).is_empty() {}
let s = [0].as_slice();
if s.is_empty() {}
if s.is_empty() {}
if s.is_empty()
&& s.is_empty()
{}
// 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]
{}
}