Updated snapshots.

tests/snapshots/output/plain.snapshot.txt

@@ -20,3 +20,17 @@ fn area(rectangle: &Rectangle) -> u32 {
 fn perimeter(rectangle: &Rectangle) -> u32 {
     (rectangle.width + rectangle.height) * 2
 }
+
+// Tab alignment:
+/*
+        Indent
+        1       2       3       4
+1       ?
+22      ?
+333     ?
+4444    ?
+55555   ?
+666666  ?
+7777777 ?
+88888888        ?
+*/