update snapshot tests

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:  "<22><><EFBFBD><EFBFBD><EFBFBD>"#;
-  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:  "<22><><EFBFBD><EFBFBD><EFBFBD>"#;
+  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 }