diff --git a/tests/source/expr.rs b/tests/source/expr.rs
index 1a8d35f2f0c..4353efac4ec 100644
--- a/tests/source/expr.rs
+++ b/tests/source/expr.rs
@@ -355,3 +355,7 @@ fn newlines_between_list_like_expr() {
         _ => bar(),
     };
 }
+
+fn issue2178() {
+    Ok(result.iter().map(|item| ls_util::rls_to_location(item)).collect())
+}
diff --git a/tests/target/expr.rs b/tests/target/expr.rs
index 08803e5db4e..0206548b31b 100644
--- a/tests/target/expr.rs
+++ b/tests/target/expr.rs
@@ -408,3 +408,10 @@ fn newlines_between_list_like_expr() {
         _ => bar(),
     };
 }
+
+fn issue2178() {
+    Ok(result
+        .iter()
+        .map(|item| ls_util::rls_to_location(item))
+        .collect())
+}