MatchError when match receives an IndexedSeq but not a LinearSeq

Question

Is there a reason that match written against Seq would work differently on IndexedSeq types than the way it does on LinearSeq

Answer 1

Followed pattern match works for List, Seq, LinearSeq, IndexedSeq, Vector.

  Vector(1,2) match {
  case a +: as => s"$a + $as"
  case _      => "empty"  
}