diff --git a/tests/source/struct_lits.rs b/tests/source/struct_lits.rs
index 216ce08099d..98ac6fab799 100644
--- a/tests/source/struct_lits.rs
+++ b/tests/source/struct_lits.rs
@@ -100,3 +100,14 @@ fn issue123() {
 
     Foo { a: ddddddddddddddddddddd, b: cccccccccccccccccccccccccccccccccccccc };
 }
+
+fn issue491() {
+    Foo {
+        guard: None,
+        arm: 0, // Comment
+    };
+
+    Foo {
+        arm: 0, // Comment
+    };
+}
diff --git a/tests/target/struct_lits.rs b/tests/target/struct_lits.rs
index 445b8028340..3ece0cb23a3 100644
--- a/tests/target/struct_lits.rs
+++ b/tests/target/struct_lits.rs
@@ -132,3 +132,12 @@ fn issue123() {
         b: cccccccccccccccccccccccccccccccccccccc,
     };
 }
+
+fn issue491() {
+    Foo {
+        guard: None,
+        arm: 0, // Comment
+    };
+
+    Foo { arm: 0 /* Comment */ };
+}