SET-IGNORE-OK.html -- ACL2 Version 6.3

## SET-IGNORE-OK

allow unused formals and locals without an `ignore` or `ignorable` declaration

    Major Section:  SWITCHES-PARAMETERS-AND-MODES

    Examples:
    (set-ignore-ok t)
    (set-ignore-ok nil)
    (set-ignore-ok :warn)

The first example above allows unused formals and locals, i.e., variables that would normally have to be declared `ignore`d or `ignorable`. The second example disallows unused formals and locals; this is the default. The third example allows them, but prints an appropriate warning.

Note: This is an event! It does not print the usual event summary but nevertheless changes the ACL2 logical world and is so recorded. Moreover, its effect is to set the `acl2-defaults-table`, and hence its effect is `local` to the book or `encapsulate` form containing it; see acl2-defaults-table.

    General Form:
    (set-ignore-ok flg)

where `flg` is either `t`, `nil`, or `:warn`.

One might find this event useful when one is generating function definitions by an automated procedure, when that procedure does not take care to make sure that all formals are actually used in the definitions that it generates.

Note: Defun will continue to report irrelevant formals even if `:set-ignore-ok` has been set to `t`, unless you also use `set-irrelevant-formals-ok` to instruct it otherwise.