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object Test extends App {
val s: Seq[Int] = Stream.from(1)
val res0 = s.map(a => 2).head
val res1 = Stream.from(1).flatMap(a => List(1)).head
println((for{a <- Stream.from(1); b <- 1 to 5; if a > 10} yield a).head)
println((for{a <- Stream.from(1); b <- 1 to a; if a > 10} yield a).head)
}
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