INCOMPATIBLE.html -- ACL2 Version 6.3

## INCOMPATIBLE

declaring that two rules should not both be enabled

    Major Section:  THEORIES

    Example:
    (theory-invariant (incompatible (:rewrite left-to-right)
                                    (:rewrite right-to-left)))

    General Form:
    (incompatible rune1 rune2)

where `rune1` and `rune2` are two specific runes. The arguments are not evaluated. `Invariant` is just a macro that expands into a term that checks that not both runes are enabled. See theory-invariant.