File: t2031.check

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t2031.scala:8: error: polymorphic expression cannot be instantiated to expected type;
 found   : [A]scala.collection.mutable.Builder[A,scala.collection.immutable.TreeSet[A]]
 required: scala.collection.generic.CanBuildFrom[scala.collection.immutable.TreeSet[Int],Int,?]
 res0.map(x => x)(TreeSet.newBuilder)
                          ^
one error found