On Oct 29, 2018, at 10:52 AM, Steve Johnson
We actually had a pretty good system for making changes like that. First, we would
the compiler to accept both the old and the new. Then we would produce a warning
that on a particular date the old would no longer work. Then we made the old an error
and printed a message about how to fix it. Eventually, we just let it be a syntax
This process was applied many times on the way from typeless B to strongly typed C.
Was there ever a time when a change was desired that you couldn’t accept both
the old and the new?