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package scala
package reflect.internal.util
/** A simple three value type for booleans with an unknown value */
object ThreeValues {
type ThreeValue = Byte
final val YES = 1
final val NO = -1
final val UNKNOWN = 0
def fromBoolean(b: Boolean): ThreeValue = if (b) YES else NO
def toBoolean(x: ThreeValue): Boolean = x == YES
}
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