scala> import scala.collection.mutable import scala.collection.mutable scala> val buf = mutable.ListBuffer[Int]() val buf: scala.collection.mutable.ListBuffer[Int] = ListBuffer() scala> object o { val xs = List(1, 2, 3) } defined module o scala> import o._ import o._ scala> buf += xs -- [E007] Type Mismatch Error: --------------------------------------- 11 |buf += xs | ^^ | found: scala.collection.immutable.List[Int](o.xs) | required: Int | scala> buf ++= xs val res1: scala.collection.mutable.ListBuffer[Int] = ListBuffer(1, 2, 3) scala> import util.foo -- Error: ------------------------------------------------------------ 8 |import util.foo | ^^^ | foo is not a member of util scala> import util.foo.bar -- [E008] Member Not Found Error: ------------------------------------ 8 |import util.foo.bar | ^^^^^^^^ | value `foo` is not a member of util.type - did you mean `util.Left`? scala> :quit