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rust-clippy/tests/ui/manual_flatten.rs

76 lines
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Rust

#![warn(clippy::manual_flatten)]
fn main() {
// Test for loop over implicitly adjusted `Iterator` with `if let` expression
let x = vec![Some(1), Some(2), Some(3)];
for n in x {
if let Some(y) = n {
println!("{}", y);
}
}
// Test for loop over implicitly implicitly adjusted `Iterator` with `if let` statement
let y: Vec<Result<i32, i32>> = vec![];
for n in y.clone() {
if let Ok(n) = n {
println!("{}", n);
};
}
// Test for loop over by reference
for n in &y {
if let Ok(n) = n {
println!("{}", n);
}
}
// Test for loop over an implicit reference
// Note: if `clippy::manual_flatten` is made autofixable, this case will
// lead to a follow-up lint `clippy::into_iter_on_ref`
let z = &y;
for n in z {
if let Ok(n) = n {
println!("{}", n);
}
}
// Test for loop over `Iterator` with `if let` expression
let z = vec![Some(1), Some(2), Some(3)];
let z = z.iter();
for n in z {
if let Some(m) = n {
println!("{}", m);
}
}
// Using the `None` variant should not trigger the lint
// Note: for an autofixable suggestion, the binding in the for loop has to take the
// name of the binding in the `if let`
let z = vec![Some(1), Some(2), Some(3)];
for n in z {
if n.is_none() {
println!("Nada.");
}
}
// Using the `Err` variant should not trigger the lint
for n in y.clone() {
if let Err(e) = n {
println!("Oops: {}!", e);
}
}
// Having an else clause should not trigger the lint
for n in y.clone() {
if let Ok(n) = n {
println!("{}", n);
} else {
println!("Oops!");
}
}
// Using manual flatten should not trigger the lint
for n in vec![Some(1), Some(2), Some(3)].iter().flatten() {
println!("{}", n);
}
}