NOTE-2-6-PROOF-CHECKER.html -- ACL2 Version 6.3

### NOTE-2-6-PROOF-CHECKER

ACL2 Version 2.6 Notes on Proof-checker Changes

    Major Section:  NOTE-2-6

The proof-checker command `=`, when used with no arguments, now reports which hypothesis is being used.

The output from proof-checker command `type-alist` has been improved.

A slight change has been made to the proof-checker for commands `promote`, `casesplit`, `equiv`, and `=`, so that terms of the form `(if x nil y)` are recognized as conjunctions, `(and (not x) y)`. Thanks to Pete Manolios for suggesting that we consider such a change.

There is a new proof-checker command `print-all-concs` that prints all the conclusions of the unproved goals.

A new `proof-checker` command, `runes`, has been added. It reports the runes that have participated in the interactive proof up to the current point.