Why not gnat Ada in gcc?

[Richard Kenner]

    <<In fact, the bulk changes from ACT have been one of the biggest
    offenders in the past. >>

    Indeed, the bulk changes here were the result of having to merge two
    very different streams of development, and that was not at all easy to
    do. Hopefully that is done now, and is not something that needs
    repeating in future!

Not only that, but these changes had little to do with ACT.  They were
the result of merging the old gcc2 tree into the (then) EGCS tree.
Sure, some of those changes originated at ACT (or were done by me with
my ACT hat on), but that was not the majority of the changes.