41 lines
1.6 KiB
Rust
41 lines
1.6 KiB
Rust
/// Calls which should trigger the `UNNECESSARY_FOLD` lint
|
|
fn unnecessary_fold() {
|
|
// Can be replaced by .any
|
|
let _ = (0..3).fold(false, |acc, x| acc || x > 2);
|
|
// Can be replaced by .all
|
|
let _ = (0..3).fold(true, |acc, x| acc && x > 2);
|
|
// Can be replaced by .sum
|
|
let _ = (0..3).fold(0, |acc, x| acc + x);
|
|
// Can be replaced by .product
|
|
let _ = (0..3).fold(1, |acc, x| acc * x);
|
|
}
|
|
|
|
/// Should trigger the `UNNECESSARY_FOLD` lint, with an error span including exactly `.fold(...)`
|
|
fn unnecessary_fold_span_for_multi_element_chain() {
|
|
let _ = (0..3).map(|x| 2 * x).fold(false, |acc, x| acc || x > 2);
|
|
}
|
|
|
|
/// Calls which should not trigger the `UNNECESSARY_FOLD` lint
|
|
fn unnecessary_fold_should_ignore() {
|
|
let _ = (0..3).fold(true, |acc, x| acc || x > 2);
|
|
let _ = (0..3).fold(false, |acc, x| acc && x > 2);
|
|
let _ = (0..3).fold(1, |acc, x| acc + x);
|
|
let _ = (0..3).fold(0, |acc, x| acc * x);
|
|
let _ = (0..3).fold(0, |acc, x| 1 + acc + x);
|
|
|
|
// We only match against an accumulator on the left
|
|
// hand side. We could lint for .sum and .product when
|
|
// it's on the right, but don't for now (and this wouldn't
|
|
// be valid if we extended the lint to cover arbitrary numeric
|
|
// types).
|
|
let _ = (0..3).fold(false, |acc, x| x > 2 || acc);
|
|
let _ = (0..3).fold(true, |acc, x| x > 2 && acc);
|
|
let _ = (0..3).fold(0, |acc, x| x + acc);
|
|
let _ = (0..3).fold(1, |acc, x| x * acc);
|
|
|
|
let _ = [(0..2), (0..3)].iter().fold(0, |a, b| a + b.len());
|
|
let _ = [(0..2), (0..3)].iter().fold(1, |a, b| a * b.len());
|
|
}
|
|
|
|
fn main() {}
|