pub fn print_changes(old: &str, new: &str)Expand description
Prints a diff of changes between two strings.
If there are no changes between old and new, prints a debug message indicating so.
Otherwise, prints a unified diff of the changes, with + indicating lines that are
present in new but not old, - indicating lines that are present in old but
not new, and lines that are the same in both are prefixed with a space.