141 lines
3.6 KiB
Rust
141 lines
3.6 KiB
Rust
#![feature(plugin)]
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#![plugin(clippy)]
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#![deny(while_let_loop, empty_loop, while_let_on_iterator)]
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#![allow(dead_code, unused, cyclomatic_complexity)]
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fn main() {
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let y = Some(true);
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loop {
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//~^ERROR this loop could be written as a `while let` loop
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//~|HELP try
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//~|SUGGESTION while let Some(_x) = y {
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if let Some(_x) = y {
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let _v = 1;
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} else {
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break
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}
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}
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loop { // no error, break is not in else clause
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if let Some(_x) = y {
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let _v = 1;
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}
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break;
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}
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loop {
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//~^ERROR this loop could be written as a `while let` loop
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//~|HELP try
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//~|SUGGESTION while let Some(_x) = y {
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match y {
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Some(_x) => true,
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None => break
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};
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}
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loop {
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//~^ERROR this loop could be written as a `while let` loop
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//~|HELP try
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//~|SUGGESTION while let Some(x) = y {
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let x = match y {
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Some(x) => x,
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None => break
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};
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let _x = x;
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let _str = "foo";
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}
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loop {
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//~^ERROR this loop could be written as a `while let` loop
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//~|HELP try
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//~|SUGGESTION while let Some(x) = y {
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let x = match y {
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Some(x) => x,
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None => break,
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};
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{ let _a = "bar"; };
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{ let _b = "foobar"; }
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}
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loop { // no error, else branch does something other than break
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match y {
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Some(_x) => true,
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_ => {
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let _z = 1;
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break;
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}
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};
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}
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while let Some(x) = y { // no error, obviously
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println!("{}", x);
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}
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// #675, this used to have a wrong suggestion
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loop {
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//~^ERROR this loop could be written as a `while let` loop
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//~|HELP try
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//~|SUGGESTION while let Some(word) = "".split_whitespace().next() { .. }
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let (e, l) = match "".split_whitespace().next() {
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Some(word) => (word.is_empty(), word.len()),
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None => break
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};
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let _ = (e, l);
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}
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let mut iter = 1..20;
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while let Option::Some(x) = iter.next() { //~ERROR this loop could be written as a `for` loop
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println!("{}", x);
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}
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let mut iter = 1..20;
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while let Some(x) = iter.next() { //~ERROR this loop could be written as a `for` loop
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println!("{}", x);
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}
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let mut iter = 1..20;
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while let Some(_) = iter.next() {} //~ERROR this loop could be written as a `for` loop
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let mut iter = 1..20;
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while let None = iter.next() {} // this is fine (if nonsensical)
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let mut iter = 1..20;
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if let Some(x) = iter.next() { // also fine
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println!("{}", x)
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}
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// the following shouldn't warn because it can't be written with a for loop
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let mut iter = 1u32..20;
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while let Some(x) = iter.next() {
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println!("next: {:?}", iter.next())
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}
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// neither can this
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let mut iter = 1u32..20;
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while let Some(x) = iter.next() {
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println!("next: {:?}", iter.next());
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}
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// or this
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let mut iter = 1u32..20;
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while let Some(x) = iter.next() {break;}
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println!("Remaining iter {:?}", iter);
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// or this
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let mut iter = 1u32..20;
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while let Some(x) = iter.next() {
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iter = 1..20;
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}
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}
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// regression test (#360)
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// this should not panic
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// it's okay if further iterations of the lint
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// cause this function to trigger it
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fn no_panic<T>(slice: &[T]) {
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let mut iter = slice.iter();
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loop { //~ERROR
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let _ = match iter.next() {
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Some(ele) => ele,
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None => break
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};
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loop {} //~ERROR empty `loop {}` detected.
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}
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}
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