A Boolean value.
Holds if the
Gets an expression that has this abstract value. Two expressions that have the same concrete value also have the same abstract value, but not necessarily the other way around.
Gets an abstract value that represents the dual of this value, if any.
Gets the underlying Boolean value.
Holds if this is a singleton abstract value. That is, two expressions that have this abstract value also have the same concrete value.
Gets a textual representation of this abstract value.