NOTE-2-0.html -- ACL2 Version 6.3

## NOTE-2-0

ACL2 Version 2.0 (July, 1997) Notes

    Major Section:  RELEASE-NOTES

This is the first version of ACL2 released under the copyright of the University of Texas (UT). Future releases of ACL2 will be made from UT rather than Computational Logic, Inc. (CLI). Version 2.0 is just Version 1.9 as released by CLI, with a few bugs fixed.

A bug causing an infinite loop was fixed in functional instantiation. The bug manifested itself when two conditions occurred simultaneously: First, the functional substitution replaces a function symbol, e.g., `FOO`, with a `LAMBDA` expression containing a free variable (a variable not among in the `LAMBDA` formals). And, second, in one of the constraints being instantiated there is a call of the function symbol `FOO` within the scope of another `LAMBDA` expression. Unless you used such a functional substitution, this bug fix will not affect you.

Less important notes:

The implementation of `PRINC$` was changed so that it was no longer sensitive to the external setting of `*print-base*` and other Common Lisp special variables.

Typographical errors were fixed in the documentation.