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Scalameta umbrella module that includes all public APIs

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package scala.meta.contrib

/**
 * The motivation for this typeclass is to extract values out of trees that could have been fields
 * on the classes. However, these values are not included as fields on the tree nodes because of
 * various reasons.
 */
trait Extract[A, B] {
  def extract(a: A): List[B]
}

object Extract {
  def apply[A, B](f: A => List[B]): Extract[A, B] = new Extract[A, B] {
    @inline
    override def extract(a: A): List[B] = f(a)
  }
}