Welcome to Scala 3.8.1 (21.0.10, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
                                                                                                                                            
scala> def f[A](xs: Seq[A]): String = xs match {
         case _ :: Nil => "Seq size is 1"
         case _ => "other"
       }
def f[A](xs: Seq[A]): String
                                                                                                                                            
scala> f(List("aaa"))
val res0: String = "Seq size is 1"
                                                                                                                                            
scala> f(Vector("aaa"))
val res1: String = "other"