I would imagine it is done to avoid having a chapter at the end showing all the patches and why they were needed. A compiler course shouldn't have a bunch of e

I would imagine it is done to avoid having a chapter at the end showing all the patches and why they were needed. A compiler course shouldn't have a bunch of errors if they can be avoided. I doubt Brian Kernighan or Dennis Ritchie put all the errata at the end of their books on subsequent printings. They fixed the main text.