Add multiline test

Author: jeremystucki

tests/ui/unnecessary_fold.fixed

@@ -41,4 +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)
+        .any(|x| x > 2);
+}
+
 fn main() {}

tests/ui/unnecessary_fold.rs

@@ -41,4 +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() {}

tests/ui/unnecessary_fold.stderr

@@ -30,5 +30,11 @@ error: this `.fold` can be written more succinctly using another method
 LL |     let _: bool = (0..3).map(|x| 2 * x).fold(false, |acc, x| acc || x > 2);
    |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `.any(|x| x > 2)`
 
-error: aborting due to 5 previous errors
+error: this `.fold` can be written more succinctly using another method
+  --> $DIR/unnecessary_fold.rs:49:10
+   |
+LL |         .fold(false, |acc, x| acc || x > 2);
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `any(|x| x > 2)`
+
+error: aborting due to 6 previous errors