At the conclusion of most events (click here for a
brief discussion of events or see events ), ACL2 prints a
summary. The summary for
Summary Form: ( DEFUN APP ...) Rules: ((:FAKE-RUNE-FOR-TYPE-SET NIL)) Warnings: None Time: 0.03 seconds (prove: 0.00, print: 0.00, other: 0.03) APP
The ``rules'' listed are those used in function admission or proof summarized. What is actually listed are ``runes'' (see rune) ) which are list-structured unique names for rules in the ACL2 data base or ``world'' . Using theories you can ``enable'' and ``disable'' rules so as to make them available (or not) to the ACL2 theorem prover.
The ``warnings'' mentioned (none are listed for
app) remind the
reader whether the event provoked any warnings. The warnings
themselves would have been printed earlier in the processing and
this part of the summary just names the earlier warnings printed.
The ``time'' indicates how much processing time was used and is
divided into three parts: the time devoted to proof, to printing,
and to syntactic checks, pre-processing and data base updates.
Despite the fact that ACL2 is an applicative language it is possible
to measure time with ACL2 programs. The
state contains a
clock. The times are printed in decimal notation but are actually
counted in integral units.
APP is the value of the
defun command and was
printed by the read-eval-print loop. The fact that it is indented
one space is a subtle reminder that the command actually returned an
``error triple'', consisting of a flag indicating (in this case)
that no error occurred, a value (in this case the symbol
and the final
state ). See ld-post-eval-print
for some details. If you really want to follow that link,
however, you might see ld first.
You should now return to the Walking Tour.