rust-clippy/tests/ui/for_loop_over_option_result.rs
2019-01-08 21:46:39 +01:00

59 lines
1.3 KiB
Rust

#![warn(clippy::for_loop_over_option, clippy::for_loop_over_result)]
/// Tests for_loop_over_result and for_loop_over_option
fn for_loop_over_option_and_result() {
let option = Some(1);
let result = option.ok_or("x not found");
let v = vec![0, 1, 2];
// check FOR_LOOP_OVER_OPTION lint
for x in option {
println!("{}", x);
}
// check FOR_LOOP_OVER_RESULT lint
for x in result {
println!("{}", x);
}
for x in option.ok_or("x not found") {
println!("{}", x);
}
// make sure LOOP_OVER_NEXT lint takes clippy::precedence when next() is the last call
// in the chain
for x in v.iter().next() {
println!("{}", x);
}
// make sure we lint when next() is not the last call in the chain
for x in v.iter().next().and(Some(0)) {
println!("{}", x);
}
for x in v.iter().next().ok_or("x not found") {
println!("{}", x);
}
// check for false positives
// for loop false positive
for x in v {
println!("{}", x);
}
// while let false positive for Option
while let Some(x) = option {
println!("{}", x);
break;
}
// while let false positive for Result
while let Ok(x) = result {
println!("{}", x);
break;
}
}
fn main() {}