Add missing trailing newline to outdated error (#14689)
Unlike the other branch in match, which uses a fully formatted error, we
need to print the newline ourselves.
Before (top) and after (bottom):
<img width="1296" height="585" alt="image"
src="https://github.com/user-attachments/assets/b4122ed5-591b-4fd9-a9b7-31b1e506d8aa"
/>
