diff --git a/typed/src/errors/error.rs b/typed/src/errors/error.rs
index 7e8f8c6aaa..67552ee2d6 100644
--- a/typed/src/errors/error.rs
+++ b/typed/src/errors/error.rs
@@ -95,9 +95,7 @@ impl Error {
 
 fn underline(mut start: usize, mut end: usize) -> String {
     if start > end {
-        let tmp = start;
-        start = end;
-        end = tmp;
+        std::mem::swap(&mut start, &mut end)
     }
 
     let mut underline = String::new();