iterate List by value

[rust.git] / tests / ui / unnecessary_fold.rs

diff --git a/tests/ui/unnecessary_fold.rs b/tests/ui/unnecessary_fold.rs
index 62198e21ef7ce7ca4fb5449cd108472aef35b948..4028d80c0a3cb9efc58f60cde0095ee7151e805a 100644 (file)
--- a/tests/ui/unnecessary_fold.rs
+++ b/tests/ui/unnecessary_fold.rs
@@ -1,3 +1,7 @@
+// run-rustfix
+
+#![allow(dead_code)]
+
 /// Calls which should trigger the `UNNECESSARY_FOLD` lint
 fn unnecessary_fold() {
     // Can be replaced by .any
@@ -5,14 +9,14 @@ 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
@@ -37,4 +41,12 @@ fn unnecessary_fold_should_ignore() {
     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() {}