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import scala.collection.generic._
import scala.collection._
object Test {
def collect[A, Res](r: Traversable[A])(implicit bf: CanBuild[A, Res]) = {
val b = bf()
for (a <- r) b += a
b.result
}
collect[Int, Vector[Int]](List(1,2,3,4))
collect[Char, String](List('1','2','3','4'))
collect[Char, Array[Char]](List('1','2','3','4'))
}
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