diff --git a/tests/snapshots/output/changes.snapshot.txt b/tests/snapshots/output/changes.snapshot.txt
index 28d87201f0..6f88351717 100644
--- a/tests/snapshots/output/changes.snapshot.txt
+++ b/tests/snapshots/output/changes.snapshot.txt
@@ -1,3 +1,4 @@
++ /// A rectangle. First line is changed to prevent a regression of #1869
   struct Rectangle {
       width: u32,
       height: u32,
diff --git a/tests/snapshots/output/changes_grid.snapshot.txt b/tests/snapshots/output/changes_grid.snapshot.txt
index 04767b8b3a..6de1f8f651 100644
--- a/tests/snapshots/output/changes_grid.snapshot.txt
+++ b/tests/snapshots/output/changes_grid.snapshot.txt
@@ -1,4 +1,5 @@
 ──┬─────────────────────────────────────────────────────────────────────────────
++ │ /// A rectangle. First line is changed to prevent a regression of #1869
   │ struct Rectangle {
   │     width: u32,
   │     height: u32,
diff --git a/tests/snapshots/output/changes_grid_header.snapshot.txt b/tests/snapshots/output/changes_grid_header.snapshot.txt
index 655b6e248f..98518e196e 100644
--- a/tests/snapshots/output/changes_grid_header.snapshot.txt
+++ b/tests/snapshots/output/changes_grid_header.snapshot.txt
@@ -1,6 +1,7 @@
 ──┬─────────────────────────────────────────────────────────────────────────────
   │ File: sample.rs
 ──┼─────────────────────────────────────────────────────────────────────────────
++ │ /// A rectangle. First line is changed to prevent a regression of #1869
   │ struct Rectangle {
   │     width: u32,
   │     height: u32,
diff --git a/tests/snapshots/output/changes_grid_header_numbers.snapshot.txt b/tests/snapshots/output/changes_grid_header_numbers.snapshot.txt
index cee4737f4d..f8ecaa32c3 100644
--- a/tests/snapshots/output/changes_grid_header_numbers.snapshot.txt
+++ b/tests/snapshots/output/changes_grid_header_numbers.snapshot.txt
@@ -1,26 +1,27 @@
 ───────┬────────────────────────────────────────────────────────────────────────
        │ File: sample.rs
 ───────┼────────────────────────────────────────────────────────────────────────
-   1   │ struct Rectangle {
-   2   │     width: u32,
-   3   │     height: u32,
-   4   │ }
-   5   │ 
-   6 _ │ fn main() {
-   7   │     let rect1 = Rectangle { width: 30, height: 50 };
-   8   │ 
-   9   │     println!(
-  10 ~ │         "The perimeter of the rectangle is {} pixels.",
-  11 ~ │         perimeter(&rect1)
-  12   │     );
-  13 + │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   │ }
-  15   │ 
-  16   │ fn area(rectangle: &Rectangle) -> u32 {
-  17   │     rectangle.width * rectangle.height
-  18   │ }
-  19 + │ 
-  20 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 + │     (rectangle.width + rectangle.height) * 2
-  22 + │ }
+   1 + │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2   │ struct Rectangle {
+   3   │     width: u32,
+   4   │     height: u32,
+   5   │ }
+   6   │ 
+   7 _ │ fn main() {
+   8   │     let rect1 = Rectangle { width: 30, height: 50 };
+   9   │ 
+  10   │     println!(
+  11 ~ │         "The perimeter of the rectangle is {} pixels.",
+  12 ~ │         perimeter(&rect1)
+  13   │     );
+  14 + │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   │ }
+  16   │ 
+  17   │ fn area(rectangle: &Rectangle) -> u32 {
+  18   │     rectangle.width * rectangle.height
+  19   │ }
+  20 + │ 
+  21 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 + │     (rectangle.width + rectangle.height) * 2
+  23 + │ }
 ───────┴────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/changes_grid_header_numbers_rule.snapshot.txt b/tests/snapshots/output/changes_grid_header_numbers_rule.snapshot.txt
index cee4737f4d..f8ecaa32c3 100644
--- a/tests/snapshots/output/changes_grid_header_numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_grid_header_numbers_rule.snapshot.txt
@@ -1,26 +1,27 @@
 ───────┬────────────────────────────────────────────────────────────────────────
        │ File: sample.rs
 ───────┼────────────────────────────────────────────────────────────────────────
-   1   │ struct Rectangle {
-   2   │     width: u32,
-   3   │     height: u32,
-   4   │ }
-   5   │ 
-   6 _ │ fn main() {
-   7   │     let rect1 = Rectangle { width: 30, height: 50 };
-   8   │ 
-   9   │     println!(
-  10 ~ │         "The perimeter of the rectangle is {} pixels.",
-  11 ~ │         perimeter(&rect1)
-  12   │     );
-  13 + │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   │ }
-  15   │ 
-  16   │ fn area(rectangle: &Rectangle) -> u32 {
-  17   │     rectangle.width * rectangle.height
-  18   │ }
-  19 + │ 
-  20 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 + │     (rectangle.width + rectangle.height) * 2
-  22 + │ }
+   1 + │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2   │ struct Rectangle {
+   3   │     width: u32,
+   4   │     height: u32,
+   5   │ }
+   6   │ 
+   7 _ │ fn main() {
+   8   │     let rect1 = Rectangle { width: 30, height: 50 };
+   9   │ 
+  10   │     println!(
+  11 ~ │         "The perimeter of the rectangle is {} pixels.",
+  12 ~ │         perimeter(&rect1)
+  13   │     );
+  14 + │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   │ }
+  16   │ 
+  17   │ fn area(rectangle: &Rectangle) -> u32 {
+  18   │     rectangle.width * rectangle.height
+  19   │ }
+  20 + │ 
+  21 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 + │     (rectangle.width + rectangle.height) * 2
+  23 + │ }
 ───────┴────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/changes_grid_header_rule.snapshot.txt b/tests/snapshots/output/changes_grid_header_rule.snapshot.txt
index 655b6e248f..98518e196e 100644
--- a/tests/snapshots/output/changes_grid_header_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_grid_header_rule.snapshot.txt
@@ -1,6 +1,7 @@
 ──┬─────────────────────────────────────────────────────────────────────────────
   │ File: sample.rs
 ──┼─────────────────────────────────────────────────────────────────────────────
++ │ /// A rectangle. First line is changed to prevent a regression of #1869
   │ struct Rectangle {
   │     width: u32,
   │     height: u32,
diff --git a/tests/snapshots/output/changes_grid_numbers.snapshot.txt b/tests/snapshots/output/changes_grid_numbers.snapshot.txt
index 7fe7cccfdc..0154a2b092 100644
--- a/tests/snapshots/output/changes_grid_numbers.snapshot.txt
+++ b/tests/snapshots/output/changes_grid_numbers.snapshot.txt
@@ -1,24 +1,25 @@
 ───────┬────────────────────────────────────────────────────────────────────────
-   1   │ struct Rectangle {
-   2   │     width: u32,
-   3   │     height: u32,
-   4   │ }
-   5   │ 
-   6 _ │ fn main() {
-   7   │     let rect1 = Rectangle { width: 30, height: 50 };
-   8   │ 
-   9   │     println!(
-  10 ~ │         "The perimeter of the rectangle is {} pixels.",
-  11 ~ │         perimeter(&rect1)
-  12   │     );
-  13 + │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   │ }
-  15   │ 
-  16   │ fn area(rectangle: &Rectangle) -> u32 {
-  17   │     rectangle.width * rectangle.height
-  18   │ }
-  19 + │ 
-  20 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 + │     (rectangle.width + rectangle.height) * 2
-  22 + │ }
+   1 + │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2   │ struct Rectangle {
+   3   │     width: u32,
+   4   │     height: u32,
+   5   │ }
+   6   │ 
+   7 _ │ fn main() {
+   8   │     let rect1 = Rectangle { width: 30, height: 50 };
+   9   │ 
+  10   │     println!(
+  11 ~ │         "The perimeter of the rectangle is {} pixels.",
+  12 ~ │         perimeter(&rect1)
+  13   │     );
+  14 + │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   │ }
+  16   │ 
+  17   │ fn area(rectangle: &Rectangle) -> u32 {
+  18   │     rectangle.width * rectangle.height
+  19   │ }
+  20 + │ 
+  21 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 + │     (rectangle.width + rectangle.height) * 2
+  23 + │ }
 ───────┴────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/changes_grid_numbers_rule.snapshot.txt b/tests/snapshots/output/changes_grid_numbers_rule.snapshot.txt
index 7fe7cccfdc..0154a2b092 100644
--- a/tests/snapshots/output/changes_grid_numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_grid_numbers_rule.snapshot.txt
@@ -1,24 +1,25 @@
 ───────┬────────────────────────────────────────────────────────────────────────
-   1   │ struct Rectangle {
-   2   │     width: u32,
-   3   │     height: u32,
-   4   │ }
-   5   │ 
-   6 _ │ fn main() {
-   7   │     let rect1 = Rectangle { width: 30, height: 50 };
-   8   │ 
-   9   │     println!(
-  10 ~ │         "The perimeter of the rectangle is {} pixels.",
-  11 ~ │         perimeter(&rect1)
-  12   │     );
-  13 + │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   │ }
-  15   │ 
-  16   │ fn area(rectangle: &Rectangle) -> u32 {
-  17   │     rectangle.width * rectangle.height
-  18   │ }
-  19 + │ 
-  20 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 + │     (rectangle.width + rectangle.height) * 2
-  22 + │ }
+   1 + │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2   │ struct Rectangle {
+   3   │     width: u32,
+   4   │     height: u32,
+   5   │ }
+   6   │ 
+   7 _ │ fn main() {
+   8   │     let rect1 = Rectangle { width: 30, height: 50 };
+   9   │ 
+  10   │     println!(
+  11 ~ │         "The perimeter of the rectangle is {} pixels.",
+  12 ~ │         perimeter(&rect1)
+  13   │     );
+  14 + │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   │ }
+  16   │ 
+  17   │ fn area(rectangle: &Rectangle) -> u32 {
+  18   │     rectangle.width * rectangle.height
+  19   │ }
+  20 + │ 
+  21 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 + │     (rectangle.width + rectangle.height) * 2
+  23 + │ }
 ───────┴────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/changes_grid_rule.snapshot.txt b/tests/snapshots/output/changes_grid_rule.snapshot.txt
index 04767b8b3a..6de1f8f651 100644
--- a/tests/snapshots/output/changes_grid_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_grid_rule.snapshot.txt
@@ -1,4 +1,5 @@
 ──┬─────────────────────────────────────────────────────────────────────────────
++ │ /// A rectangle. First line is changed to prevent a regression of #1869
   │ struct Rectangle {
   │     width: u32,
   │     height: u32,
diff --git a/tests/snapshots/output/changes_header.snapshot.txt b/tests/snapshots/output/changes_header.snapshot.txt
index 82fe8c47cb..d5c1afd920 100644
--- a/tests/snapshots/output/changes_header.snapshot.txt
+++ b/tests/snapshots/output/changes_header.snapshot.txt
@@ -1,4 +1,5 @@
   File: sample.rs
++ /// A rectangle. First line is changed to prevent a regression of #1869
   struct Rectangle {
       width: u32,
       height: u32,
diff --git a/tests/snapshots/output/changes_header_numbers.snapshot.txt b/tests/snapshots/output/changes_header_numbers.snapshot.txt
index 77145eb9b2..cc99df08b3 100644
--- a/tests/snapshots/output/changes_header_numbers.snapshot.txt
+++ b/tests/snapshots/output/changes_header_numbers.snapshot.txt
@@ -1,23 +1,24 @@
        File: sample.rs
-   1   struct Rectangle {
-   2       width: u32,
-   3       height: u32,
-   4   }
-   5   
-   6 _ fn main() {
-   7       let rect1 = Rectangle { width: 30, height: 50 };
-   8   
-   9       println!(
-  10 ~         "The perimeter of the rectangle is {} pixels.",
-  11 ~         perimeter(&rect1)
-  12       );
-  13 +     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   }
-  15   
-  16   fn area(rectangle: &Rectangle) -> u32 {
-  17       rectangle.width * rectangle.height
-  18   }
-  19 + 
-  20 + fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 +     (rectangle.width + rectangle.height) * 2
-  22 + }
+   1 + /// A rectangle. First line is changed to prevent a regression of #1869
+   2   struct Rectangle {
+   3       width: u32,
+   4       height: u32,
+   5   }
+   6   
+   7 _ fn main() {
+   8       let rect1 = Rectangle { width: 30, height: 50 };
+   9   
+  10       println!(
+  11 ~         "The perimeter of the rectangle is {} pixels.",
+  12 ~         perimeter(&rect1)
+  13       );
+  14 +     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   }
+  16   
+  17   fn area(rectangle: &Rectangle) -> u32 {
+  18       rectangle.width * rectangle.height
+  19   }
+  20 + 
+  21 + fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 +     (rectangle.width + rectangle.height) * 2
+  23 + }
diff --git a/tests/snapshots/output/changes_header_numbers_rule.snapshot.txt b/tests/snapshots/output/changes_header_numbers_rule.snapshot.txt
index 77145eb9b2..cc99df08b3 100644
--- a/tests/snapshots/output/changes_header_numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_header_numbers_rule.snapshot.txt
@@ -1,23 +1,24 @@
        File: sample.rs
-   1   struct Rectangle {
-   2       width: u32,
-   3       height: u32,
-   4   }
-   5   
-   6 _ fn main() {
-   7       let rect1 = Rectangle { width: 30, height: 50 };
-   8   
-   9       println!(
-  10 ~         "The perimeter of the rectangle is {} pixels.",
-  11 ~         perimeter(&rect1)
-  12       );
-  13 +     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   }
-  15   
-  16   fn area(rectangle: &Rectangle) -> u32 {
-  17       rectangle.width * rectangle.height
-  18   }
-  19 + 
-  20 + fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 +     (rectangle.width + rectangle.height) * 2
-  22 + }
+   1 + /// A rectangle. First line is changed to prevent a regression of #1869
+   2   struct Rectangle {
+   3       width: u32,
+   4       height: u32,
+   5   }
+   6   
+   7 _ fn main() {
+   8       let rect1 = Rectangle { width: 30, height: 50 };
+   9   
+  10       println!(
+  11 ~         "The perimeter of the rectangle is {} pixels.",
+  12 ~         perimeter(&rect1)
+  13       );
+  14 +     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   }
+  16   
+  17   fn area(rectangle: &Rectangle) -> u32 {
+  18       rectangle.width * rectangle.height
+  19   }
+  20 + 
+  21 + fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 +     (rectangle.width + rectangle.height) * 2
+  23 + }
diff --git a/tests/snapshots/output/changes_header_rule.snapshot.txt b/tests/snapshots/output/changes_header_rule.snapshot.txt
index 82fe8c47cb..d5c1afd920 100644
--- a/tests/snapshots/output/changes_header_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_header_rule.snapshot.txt
@@ -1,4 +1,5 @@
   File: sample.rs
++ /// A rectangle. First line is changed to prevent a regression of #1869
   struct Rectangle {
       width: u32,
       height: u32,
diff --git a/tests/snapshots/output/changes_numbers.snapshot.txt b/tests/snapshots/output/changes_numbers.snapshot.txt
index bdfe745bff..5b4044110e 100644
--- a/tests/snapshots/output/changes_numbers.snapshot.txt
+++ b/tests/snapshots/output/changes_numbers.snapshot.txt
@@ -1,22 +1,23 @@
-   1   struct Rectangle {
-   2       width: u32,
-   3       height: u32,
-   4   }
-   5   
-   6 _ fn main() {
-   7       let rect1 = Rectangle { width: 30, height: 50 };
-   8   
-   9       println!(
-  10 ~         "The perimeter of the rectangle is {} pixels.",
-  11 ~         perimeter(&rect1)
-  12       );
-  13 +     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   }
-  15   
-  16   fn area(rectangle: &Rectangle) -> u32 {
-  17       rectangle.width * rectangle.height
-  18   }
-  19 + 
-  20 + fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 +     (rectangle.width + rectangle.height) * 2
-  22 + }
+   1 + /// A rectangle. First line is changed to prevent a regression of #1869
+   2   struct Rectangle {
+   3       width: u32,
+   4       height: u32,
+   5   }
+   6   
+   7 _ fn main() {
+   8       let rect1 = Rectangle { width: 30, height: 50 };
+   9   
+  10       println!(
+  11 ~         "The perimeter of the rectangle is {} pixels.",
+  12 ~         perimeter(&rect1)
+  13       );
+  14 +     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   }
+  16   
+  17   fn area(rectangle: &Rectangle) -> u32 {
+  18       rectangle.width * rectangle.height
+  19   }
+  20 + 
+  21 + fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 +     (rectangle.width + rectangle.height) * 2
+  23 + }
diff --git a/tests/snapshots/output/changes_numbers_rule.snapshot.txt b/tests/snapshots/output/changes_numbers_rule.snapshot.txt
index bdfe745bff..5b4044110e 100644
--- a/tests/snapshots/output/changes_numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_numbers_rule.snapshot.txt
@@ -1,22 +1,23 @@
-   1   struct Rectangle {
-   2       width: u32,
-   3       height: u32,
-   4   }
-   5   
-   6 _ fn main() {
-   7       let rect1 = Rectangle { width: 30, height: 50 };
-   8   
-   9       println!(
-  10 ~         "The perimeter of the rectangle is {} pixels.",
-  11 ~         perimeter(&rect1)
-  12       );
-  13 +     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   }
-  15   
-  16   fn area(rectangle: &Rectangle) -> u32 {
-  17       rectangle.width * rectangle.height
-  18   }
-  19 + 
-  20 + fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 +     (rectangle.width + rectangle.height) * 2
-  22 + }
+   1 + /// A rectangle. First line is changed to prevent a regression of #1869
+   2   struct Rectangle {
+   3       width: u32,
+   4       height: u32,
+   5   }
+   6   
+   7 _ fn main() {
+   8       let rect1 = Rectangle { width: 30, height: 50 };
+   9   
+  10       println!(
+  11 ~         "The perimeter of the rectangle is {} pixels.",
+  12 ~         perimeter(&rect1)
+  13       );
+  14 +     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   }
+  16   
+  17   fn area(rectangle: &Rectangle) -> u32 {
+  18       rectangle.width * rectangle.height
+  19   }
+  20 + 
+  21 + fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 +     (rectangle.width + rectangle.height) * 2
+  23 + }
diff --git a/tests/snapshots/output/changes_rule.snapshot.txt b/tests/snapshots/output/changes_rule.snapshot.txt
index 28d87201f0..6f88351717 100644
--- a/tests/snapshots/output/changes_rule.snapshot.txt
+++ b/tests/snapshots/output/changes_rule.snapshot.txt
@@ -1,3 +1,4 @@
++ /// A rectangle. First line is changed to prevent a regression of #1869
   struct Rectangle {
       width: u32,
       height: u32,
diff --git a/tests/snapshots/output/full.snapshot.txt b/tests/snapshots/output/full.snapshot.txt
index cee4737f4d..f8ecaa32c3 100644
--- a/tests/snapshots/output/full.snapshot.txt
+++ b/tests/snapshots/output/full.snapshot.txt
@@ -1,26 +1,27 @@
 ───────┬────────────────────────────────────────────────────────────────────────
        │ File: sample.rs
 ───────┼────────────────────────────────────────────────────────────────────────
-   1   │ struct Rectangle {
-   2   │     width: u32,
-   3   │     height: u32,
-   4   │ }
-   5   │ 
-   6 _ │ fn main() {
-   7   │     let rect1 = Rectangle { width: 30, height: 50 };
-   8   │ 
-   9   │     println!(
-  10 ~ │         "The perimeter of the rectangle is {} pixels.",
-  11 ~ │         perimeter(&rect1)
-  12   │     );
-  13 + │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14   │ }
-  15   │ 
-  16   │ fn area(rectangle: &Rectangle) -> u32 {
-  17   │     rectangle.width * rectangle.height
-  18   │ }
-  19 + │ 
-  20 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 + │     (rectangle.width + rectangle.height) * 2
-  22 + │ }
+   1 + │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2   │ struct Rectangle {
+   3   │     width: u32,
+   4   │     height: u32,
+   5   │ }
+   6   │ 
+   7 _ │ fn main() {
+   8   │     let rect1 = Rectangle { width: 30, height: 50 };
+   9   │ 
+  10   │     println!(
+  11 ~ │         "The perimeter of the rectangle is {} pixels.",
+  12 ~ │         perimeter(&rect1)
+  13   │     );
+  14 + │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15   │ }
+  16   │ 
+  17   │ fn area(rectangle: &Rectangle) -> u32 {
+  18   │     rectangle.width * rectangle.height
+  19   │ }
+  20 + │ 
+  21 + │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 + │     (rectangle.width + rectangle.height) * 2
+  23 + │ }
 ───────┴────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/grid.snapshot.txt b/tests/snapshots/output/grid.snapshot.txt
index 5b970581f5..7061949760 100644
--- a/tests/snapshots/output/grid.snapshot.txt
+++ b/tests/snapshots/output/grid.snapshot.txt
@@ -1,4 +1,5 @@
 ────────────────────────────────────────────────────────────────────────────────
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/output/grid_header.snapshot.txt b/tests/snapshots/output/grid_header.snapshot.txt
index 50c16941e9..010e3a8137 100644
--- a/tests/snapshots/output/grid_header.snapshot.txt
+++ b/tests/snapshots/output/grid_header.snapshot.txt
@@ -1,6 +1,7 @@
 ────────────────────────────────────────────────────────────────────────────────
 File: sample.rs
 ────────────────────────────────────────────────────────────────────────────────
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/output/grid_header_numbers.snapshot.txt b/tests/snapshots/output/grid_header_numbers.snapshot.txt
index e9f1a9cfe6..dfbb934bb7 100644
--- a/tests/snapshots/output/grid_header_numbers.snapshot.txt
+++ b/tests/snapshots/output/grid_header_numbers.snapshot.txt
@@ -1,26 +1,27 @@
 ─────┬──────────────────────────────────────────────────────────────────────────
      │ File: sample.rs
 ─────┼──────────────────────────────────────────────────────────────────────────
-   1 │ struct Rectangle {
-   2 │     width: u32,
-   3 │     height: u32,
-   4 │ }
-   5 │ 
-   6 │ fn main() {
-   7 │     let rect1 = Rectangle { width: 30, height: 50 };
-   8 │ 
-   9 │     println!(
-  10 │         "The perimeter of the rectangle is {} pixels.",
-  11 │         perimeter(&rect1)
-  12 │     );
-  13 │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 │ }
-  15 │ 
-  16 │ fn area(rectangle: &Rectangle) -> u32 {
-  17 │     rectangle.width * rectangle.height
-  18 │ }
-  19 │ 
-  20 │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 │     (rectangle.width + rectangle.height) * 2
-  22 │ }
+   1 │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2 │ struct Rectangle {
+   3 │     width: u32,
+   4 │     height: u32,
+   5 │ }
+   6 │ 
+   7 │ fn main() {
+   8 │     let rect1 = Rectangle { width: 30, height: 50 };
+   9 │ 
+  10 │     println!(
+  11 │         "The perimeter of the rectangle is {} pixels.",
+  12 │         perimeter(&rect1)
+  13 │     );
+  14 │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 │ }
+  16 │ 
+  17 │ fn area(rectangle: &Rectangle) -> u32 {
+  18 │     rectangle.width * rectangle.height
+  19 │ }
+  20 │ 
+  21 │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 │     (rectangle.width + rectangle.height) * 2
+  23 │ }
 ─────┴──────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/grid_header_numbers_rule.snapshot.txt b/tests/snapshots/output/grid_header_numbers_rule.snapshot.txt
index e9f1a9cfe6..dfbb934bb7 100644
--- a/tests/snapshots/output/grid_header_numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/grid_header_numbers_rule.snapshot.txt
@@ -1,26 +1,27 @@
 ─────┬──────────────────────────────────────────────────────────────────────────
      │ File: sample.rs
 ─────┼──────────────────────────────────────────────────────────────────────────
-   1 │ struct Rectangle {
-   2 │     width: u32,
-   3 │     height: u32,
-   4 │ }
-   5 │ 
-   6 │ fn main() {
-   7 │     let rect1 = Rectangle { width: 30, height: 50 };
-   8 │ 
-   9 │     println!(
-  10 │         "The perimeter of the rectangle is {} pixels.",
-  11 │         perimeter(&rect1)
-  12 │     );
-  13 │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 │ }
-  15 │ 
-  16 │ fn area(rectangle: &Rectangle) -> u32 {
-  17 │     rectangle.width * rectangle.height
-  18 │ }
-  19 │ 
-  20 │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 │     (rectangle.width + rectangle.height) * 2
-  22 │ }
+   1 │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2 │ struct Rectangle {
+   3 │     width: u32,
+   4 │     height: u32,
+   5 │ }
+   6 │ 
+   7 │ fn main() {
+   8 │     let rect1 = Rectangle { width: 30, height: 50 };
+   9 │ 
+  10 │     println!(
+  11 │         "The perimeter of the rectangle is {} pixels.",
+  12 │         perimeter(&rect1)
+  13 │     );
+  14 │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 │ }
+  16 │ 
+  17 │ fn area(rectangle: &Rectangle) -> u32 {
+  18 │     rectangle.width * rectangle.height
+  19 │ }
+  20 │ 
+  21 │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 │     (rectangle.width + rectangle.height) * 2
+  23 │ }
 ─────┴──────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/grid_header_rule.snapshot.txt b/tests/snapshots/output/grid_header_rule.snapshot.txt
index 50c16941e9..010e3a8137 100644
--- a/tests/snapshots/output/grid_header_rule.snapshot.txt
+++ b/tests/snapshots/output/grid_header_rule.snapshot.txt
@@ -1,6 +1,7 @@
 ────────────────────────────────────────────────────────────────────────────────
 File: sample.rs
 ────────────────────────────────────────────────────────────────────────────────
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/output/grid_numbers.snapshot.txt b/tests/snapshots/output/grid_numbers.snapshot.txt
index 0961466704..83ee57cdca 100644
--- a/tests/snapshots/output/grid_numbers.snapshot.txt
+++ b/tests/snapshots/output/grid_numbers.snapshot.txt
@@ -1,24 +1,25 @@
 ─────┬──────────────────────────────────────────────────────────────────────────
-   1 │ struct Rectangle {
-   2 │     width: u32,
-   3 │     height: u32,
-   4 │ }
-   5 │ 
-   6 │ fn main() {
-   7 │     let rect1 = Rectangle { width: 30, height: 50 };
-   8 │ 
-   9 │     println!(
-  10 │         "The perimeter of the rectangle is {} pixels.",
-  11 │         perimeter(&rect1)
-  12 │     );
-  13 │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 │ }
-  15 │ 
-  16 │ fn area(rectangle: &Rectangle) -> u32 {
-  17 │     rectangle.width * rectangle.height
-  18 │ }
-  19 │ 
-  20 │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 │     (rectangle.width + rectangle.height) * 2
-  22 │ }
+   1 │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2 │ struct Rectangle {
+   3 │     width: u32,
+   4 │     height: u32,
+   5 │ }
+   6 │ 
+   7 │ fn main() {
+   8 │     let rect1 = Rectangle { width: 30, height: 50 };
+   9 │ 
+  10 │     println!(
+  11 │         "The perimeter of the rectangle is {} pixels.",
+  12 │         perimeter(&rect1)
+  13 │     );
+  14 │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 │ }
+  16 │ 
+  17 │ fn area(rectangle: &Rectangle) -> u32 {
+  18 │     rectangle.width * rectangle.height
+  19 │ }
+  20 │ 
+  21 │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 │     (rectangle.width + rectangle.height) * 2
+  23 │ }
 ─────┴──────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/grid_numbers_rule.snapshot.txt b/tests/snapshots/output/grid_numbers_rule.snapshot.txt
index 0961466704..83ee57cdca 100644
--- a/tests/snapshots/output/grid_numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/grid_numbers_rule.snapshot.txt
@@ -1,24 +1,25 @@
 ─────┬──────────────────────────────────────────────────────────────────────────
-   1 │ struct Rectangle {
-   2 │     width: u32,
-   3 │     height: u32,
-   4 │ }
-   5 │ 
-   6 │ fn main() {
-   7 │     let rect1 = Rectangle { width: 30, height: 50 };
-   8 │ 
-   9 │     println!(
-  10 │         "The perimeter of the rectangle is {} pixels.",
-  11 │         perimeter(&rect1)
-  12 │     );
-  13 │     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 │ }
-  15 │ 
-  16 │ fn area(rectangle: &Rectangle) -> u32 {
-  17 │     rectangle.width * rectangle.height
-  18 │ }
-  19 │ 
-  20 │ fn perimeter(rectangle: &Rectangle) -> u32 {
-  21 │     (rectangle.width + rectangle.height) * 2
-  22 │ }
+   1 │ /// A rectangle. First line is changed to prevent a regression of #1869
+   2 │ struct Rectangle {
+   3 │     width: u32,
+   4 │     height: u32,
+   5 │ }
+   6 │ 
+   7 │ fn main() {
+   8 │     let rect1 = Rectangle { width: 30, height: 50 };
+   9 │ 
+  10 │     println!(
+  11 │         "The perimeter of the rectangle is {} pixels.",
+  12 │         perimeter(&rect1)
+  13 │     );
+  14 │     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 │ }
+  16 │ 
+  17 │ fn area(rectangle: &Rectangle) -> u32 {
+  18 │     rectangle.width * rectangle.height
+  19 │ }
+  20 │ 
+  21 │ fn perimeter(rectangle: &Rectangle) -> u32 {
+  22 │     (rectangle.width + rectangle.height) * 2
+  23 │ }
 ─────┴──────────────────────────────────────────────────────────────────────────
diff --git a/tests/snapshots/output/grid_rule.snapshot.txt b/tests/snapshots/output/grid_rule.snapshot.txt
index 5b970581f5..7061949760 100644
--- a/tests/snapshots/output/grid_rule.snapshot.txt
+++ b/tests/snapshots/output/grid_rule.snapshot.txt
@@ -1,4 +1,5 @@
 ────────────────────────────────────────────────────────────────────────────────
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/output/header.snapshot.txt b/tests/snapshots/output/header.snapshot.txt
index 0889edfd32..3cbbad49d2 100644
--- a/tests/snapshots/output/header.snapshot.txt
+++ b/tests/snapshots/output/header.snapshot.txt
@@ -1,4 +1,5 @@
 File: sample.rs
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/output/header_numbers.snapshot.txt b/tests/snapshots/output/header_numbers.snapshot.txt
index a681e6b407..82fa9175a5 100644
--- a/tests/snapshots/output/header_numbers.snapshot.txt
+++ b/tests/snapshots/output/header_numbers.snapshot.txt
@@ -1,23 +1,24 @@
      File: sample.rs
-   1 struct Rectangle {
-   2     width: u32,
-   3     height: u32,
-   4 }
-   5 
-   6 fn main() {
-   7     let rect1 = Rectangle { width: 30, height: 50 };
-   8 
-   9     println!(
-  10         "The perimeter of the rectangle is {} pixels.",
-  11         perimeter(&rect1)
-  12     );
-  13     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 }
-  15 
-  16 fn area(rectangle: &Rectangle) -> u32 {
-  17     rectangle.width * rectangle.height
-  18 }
-  19 
-  20 fn perimeter(rectangle: &Rectangle) -> u32 {
-  21     (rectangle.width + rectangle.height) * 2
-  22 }
+   1 /// A rectangle. First line is changed to prevent a regression of #1869
+   2 struct Rectangle {
+   3     width: u32,
+   4     height: u32,
+   5 }
+   6 
+   7 fn main() {
+   8     let rect1 = Rectangle { width: 30, height: 50 };
+   9 
+  10     println!(
+  11         "The perimeter of the rectangle is {} pixels.",
+  12         perimeter(&rect1)
+  13     );
+  14     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 }
+  16 
+  17 fn area(rectangle: &Rectangle) -> u32 {
+  18     rectangle.width * rectangle.height
+  19 }
+  20 
+  21 fn perimeter(rectangle: &Rectangle) -> u32 {
+  22     (rectangle.width + rectangle.height) * 2
+  23 }
diff --git a/tests/snapshots/output/header_numbers_rule.snapshot.txt b/tests/snapshots/output/header_numbers_rule.snapshot.txt
index a681e6b407..82fa9175a5 100644
--- a/tests/snapshots/output/header_numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/header_numbers_rule.snapshot.txt
@@ -1,23 +1,24 @@
      File: sample.rs
-   1 struct Rectangle {
-   2     width: u32,
-   3     height: u32,
-   4 }
-   5 
-   6 fn main() {
-   7     let rect1 = Rectangle { width: 30, height: 50 };
-   8 
-   9     println!(
-  10         "The perimeter of the rectangle is {} pixels.",
-  11         perimeter(&rect1)
-  12     );
-  13     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 }
-  15 
-  16 fn area(rectangle: &Rectangle) -> u32 {
-  17     rectangle.width * rectangle.height
-  18 }
-  19 
-  20 fn perimeter(rectangle: &Rectangle) -> u32 {
-  21     (rectangle.width + rectangle.height) * 2
-  22 }
+   1 /// A rectangle. First line is changed to prevent a regression of #1869
+   2 struct Rectangle {
+   3     width: u32,
+   4     height: u32,
+   5 }
+   6 
+   7 fn main() {
+   8     let rect1 = Rectangle { width: 30, height: 50 };
+   9 
+  10     println!(
+  11         "The perimeter of the rectangle is {} pixels.",
+  12         perimeter(&rect1)
+  13     );
+  14     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 }
+  16 
+  17 fn area(rectangle: &Rectangle) -> u32 {
+  18     rectangle.width * rectangle.height
+  19 }
+  20 
+  21 fn perimeter(rectangle: &Rectangle) -> u32 {
+  22     (rectangle.width + rectangle.height) * 2
+  23 }
diff --git a/tests/snapshots/output/header_rule.snapshot.txt b/tests/snapshots/output/header_rule.snapshot.txt
index 0889edfd32..3cbbad49d2 100644
--- a/tests/snapshots/output/header_rule.snapshot.txt
+++ b/tests/snapshots/output/header_rule.snapshot.txt
@@ -1,4 +1,5 @@
 File: sample.rs
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/output/numbers.snapshot.txt b/tests/snapshots/output/numbers.snapshot.txt
index c1341d29df..560e755702 100644
--- a/tests/snapshots/output/numbers.snapshot.txt
+++ b/tests/snapshots/output/numbers.snapshot.txt
@@ -1,22 +1,23 @@
-   1 struct Rectangle {
-   2     width: u32,
-   3     height: u32,
-   4 }
-   5 
-   6 fn main() {
-   7     let rect1 = Rectangle { width: 30, height: 50 };
-   8 
-   9     println!(
-  10         "The perimeter of the rectangle is {} pixels.",
-  11         perimeter(&rect1)
-  12     );
-  13     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 }
-  15 
-  16 fn area(rectangle: &Rectangle) -> u32 {
-  17     rectangle.width * rectangle.height
-  18 }
-  19 
-  20 fn perimeter(rectangle: &Rectangle) -> u32 {
-  21     (rectangle.width + rectangle.height) * 2
-  22 }
+   1 /// A rectangle. First line is changed to prevent a regression of #1869
+   2 struct Rectangle {
+   3     width: u32,
+   4     height: u32,
+   5 }
+   6 
+   7 fn main() {
+   8     let rect1 = Rectangle { width: 30, height: 50 };
+   9 
+  10     println!(
+  11         "The perimeter of the rectangle is {} pixels.",
+  12         perimeter(&rect1)
+  13     );
+  14     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 }
+  16 
+  17 fn area(rectangle: &Rectangle) -> u32 {
+  18     rectangle.width * rectangle.height
+  19 }
+  20 
+  21 fn perimeter(rectangle: &Rectangle) -> u32 {
+  22     (rectangle.width + rectangle.height) * 2
+  23 }
diff --git a/tests/snapshots/output/numbers_rule.snapshot.txt b/tests/snapshots/output/numbers_rule.snapshot.txt
index c1341d29df..560e755702 100644
--- a/tests/snapshots/output/numbers_rule.snapshot.txt
+++ b/tests/snapshots/output/numbers_rule.snapshot.txt
@@ -1,22 +1,23 @@
-   1 struct Rectangle {
-   2     width: u32,
-   3     height: u32,
-   4 }
-   5 
-   6 fn main() {
-   7     let rect1 = Rectangle { width: 30, height: 50 };
-   8 
-   9     println!(
-  10         "The perimeter of the rectangle is {} pixels.",
-  11         perimeter(&rect1)
-  12     );
-  13     println!(r#"This line contains invalid utf8:  "�����"#;
-  14 }
-  15 
-  16 fn area(rectangle: &Rectangle) -> u32 {
-  17     rectangle.width * rectangle.height
-  18 }
-  19 
-  20 fn perimeter(rectangle: &Rectangle) -> u32 {
-  21     (rectangle.width + rectangle.height) * 2
-  22 }
+   1 /// A rectangle. First line is changed to prevent a regression of #1869
+   2 struct Rectangle {
+   3     width: u32,
+   4     height: u32,
+   5 }
+   6 
+   7 fn main() {
+   8     let rect1 = Rectangle { width: 30, height: 50 };
+   9 
+  10     println!(
+  11         "The perimeter of the rectangle is {} pixels.",
+  12         perimeter(&rect1)
+  13     );
+  14     println!(r#"This line contains invalid utf8:  "�����"#;
+  15 }
+  16 
+  17 fn area(rectangle: &Rectangle) -> u32 {
+  18     rectangle.width * rectangle.height
+  19 }
+  20 
+  21 fn perimeter(rectangle: &Rectangle) -> u32 {
+  22     (rectangle.width + rectangle.height) * 2
+  23 }
diff --git a/tests/snapshots/output/plain.snapshot.txt b/tests/snapshots/output/plain.snapshot.txt
index dbc49f9fdd..b9da99a904 100644
--- a/tests/snapshots/output/plain.snapshot.txt
+++ b/tests/snapshots/output/plain.snapshot.txt
@@ -1,3 +1,4 @@
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/output/rule.snapshot.txt b/tests/snapshots/output/rule.snapshot.txt
index dbc49f9fdd..b9da99a904 100644
--- a/tests/snapshots/output/rule.snapshot.txt
+++ b/tests/snapshots/output/rule.snapshot.txt
@@ -1,3 +1,4 @@
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,
diff --git a/tests/snapshots/sample.modified.rs b/tests/snapshots/sample.modified.rs
index bb1a794375..fff9f98213 100644
--- a/tests/snapshots/sample.modified.rs
+++ b/tests/snapshots/sample.modified.rs
@@ -1,3 +1,4 @@
+/// A rectangle. First line is changed to prevent a regression of #1869
 struct Rectangle {
     width: u32,
     height: u32,