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rust-clippy/tests/ui/never_loop.rs

204 lines
2.9 KiB
Rust

#![allow(
clippy::single_match,
unused_assignments,
unused_variables,
clippy::while_immutable_condition
)]
fn test1() {
let mut x = 0;
loop {
// clippy::never_loop
x += 1;
if x == 1 {
return;
}
break;
}
}
fn test2() {
let mut x = 0;
loop {
x += 1;
if x == 1 {
break;
}
}
}
fn test3() {
let mut x = 0;
loop {
// never loops
x += 1;
break;
}
}
fn test4() {
let mut x = 1;
loop {
x += 1;
match x {
5 => return,
_ => (),
}
}
}
fn test5() {
let i = 0;
loop {
// never loops
while i == 0 {
// never loops
break;
}
return;
}
}
fn test6() {
let mut x = 0;
'outer: loop {
x += 1;
loop {
// never loops
if x == 5 {
break;
}
continue 'outer;
}
return;
}
}
fn test7() {
let mut x = 0;
loop {
x += 1;
match x {
1 => continue,
_ => (),
}
return;
}
}
fn test8() {
let mut x = 0;
loop {
x += 1;
match x {
5 => return,
_ => continue,
}
}
}
fn test9() {
let x = Some(1);
while let Some(y) = x {
// never loops
return;
}
}
fn test10() {
for x in 0..10 {
// never loops
match x {
1 => break,
_ => return,
}
}
}
fn test11<F: FnMut() -> i32>(mut f: F) {
loop {
return match f() {
1 => continue,
_ => (),
};
}
}
pub fn test12(a: bool, b: bool) {
'label: loop {
loop {
if a {
continue 'label;
}
if b {
break;
}
}
break;
}
}
pub fn test13() {
let mut a = true;
loop {
// infinite loop
while a {
if true {
a = false;
continue;
}
return;
}
}
}
pub fn test14() {
let mut a = true;
'outer: while a {
// never loops
while a {
if a {
a = false;
continue;
}
}
break 'outer;
}
}
// Issue #1991: the outer loop should not warn.
pub fn test15() {
'label: loop {
while false {
break 'label;
}
}
}
// Issue #4058: `continue` in `break` expression
pub fn test16() {
let mut n = 1;
loop {
break if n != 5 {
n += 1;
continue;
};
}
}
fn main() {
test1();
test2();
test3();
test4();
test5();
test6();
test7();
test8();
test9();
test10();
test11(|| 0);
test12(true, false);
test13();
test14();
}