-// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
+// run-rustfix
+
+#![allow(dead_code)]
/// Calls which should trigger the `UNNECESSARY_FOLD` lint
fn unnecessary_fold() {
// 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);
+ let _: i32 = (0..3).fold(0, |acc, x| acc + x);
// Can be replaced by .product
- let _ = (0..3).fold(1, |acc, x| acc * x);
+ let _: i32 = (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);
+ let _: bool = (0..3).map(|x| 2 * x).fold(false, |acc, x| acc || x > 2);
}
/// Calls which should not trigger the `UNNECESSARY_FOLD` lint
let _ = [(0..2), (0..3)].iter().fold(1, |a, b| a * b.len());
}
+/// Should lint only the line containing the fold
+fn unnecessary_fold_over_multiple_lines() {
+ let _ = (0..3)
+ .map(|x| x + 1)
+ .filter(|x| x % 2 == 0)
+ .fold(false, |acc, x| acc || x > 2);
+}
+
fn main() {}