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t3774.scala:4: error: overloaded method value ++ with alternatives:
[B1 >: List[Int]](xs: scala.collection.GenTraversableOnce[((Int, Int), B1)])scala.collection.immutable.Map[(Int, Int),B1] <and>
[B >: ((Int, Int), List[Int]), That](that: scala.collection.GenTraversableOnce[B])(implicit bf: scala.collection.generic.CanBuildFrom[scala.collection.immutable.Map[(Int, Int),List[Int]],B,That])That
cannot be applied to (scala.collection.immutable.IndexedSeq[((Int, Int), scala.collection.immutable.Range.Inclusive)])
Map[(Int,Int),List[Int]]() ++ (for(x <- 0 to 1 ; y <- 0 to 1) yield {(x,y)-> (0 to 1)})
^
one error found
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