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scala> import scala.collection.mutable
import scala.collection.mutable
scala> val buf = mutable.ListBuffer[Int]()
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
-- [E006] Type Mismatch Error: <console> -------------------------------------------------------------------------------
10:buf += xs
^^
found: scala.collection.immutable.List[Int](o.xs)
required: scala.collection.immutable.List[Int](o.xs)
-- [E006] Type Mismatch Error: <console> -------------------------------------------------------------------------------
10:buf += xs
^^^^^^^^^
found: String
required: String
scala> buf ++= xs
res1: scala.collection.mutable.ListBuffer[Int] = ListBuffer(1, 2, 3)
scala> :quit
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