Major Section: SWITCHES-PARAMETERS-AND-MODES
Examples: (tau-status) (tau-status :system t) (tau-status :auto-mode nil) (tau-status :system t :auto-mode nil) General Form: (tau-status :system a :auto-mode b)
where a and b are Booleans. Both keyword arguments are optional and
they may be presented in either order. Value a controls whether the
tau-system is used during subsequent proofs. Value b controls
whether tau system rules are added automatically (``greedily'') when rules of
other rule-classes are added. If no arguments are supplied, this is
not an event and just returns an error-triple (see error-triples) indicating
the current settings. See introduction-to-the-tau-system for background
details.
The two flags are independent. For example, the tau system may be disabled in proof attempts even though it is automatically (and silently) extending its database as rules of other classes are added.
Flag (a) is actually toggled by enabling or disabling the
:executable-counterpart of tau-system. Flag (b) is toggled with the
function set-tau-auto-mode, which manipulates the
acl2-defaults-table.
This macro expands into zero, one, or two events, as required by the
supplied values of flags a and b.
If no arguments are supplied the form is not an event and simply returns (as
an error triple (mv nil ans state); see error-triples) the current
settings of the two flags. For example:
ACL2 !>(tau-system) ((:SYSTEM NIL) (:AUTO-MODE T))
intended to be self-explanatory.
