Does anyone happen to have copies of the source code for very early GNAT releases? The earliest I can find is GNAT 1.67 from 1993. This version is mostly written in Ada 83, but its source code contains a few uses of Ada 95 features. (e.g. child packages)
From what I can tell GNAT was first bootstrapped in June of 1993; before that point it was built using a proprietary Alsys compiler.
Would be valuable to have the earliest GNAT release that was capable of self-hosting for historical reasons and for people interested in bootstrapping GNAT without relying on pre-built binaries. (it is much easier to write an Ada 83 compiler than an Ada 95 compiler)
Maybe AdaCore has a copy?