scala.MatchError: (List(),(a,1)) (of class scala.Tuple2)

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via Stack Overflow by Евгений Evgeniy
, 9 months ago
(List(),(a,1)) (of class scala.Tuple2)
scala.MatchError: (List(),(a,1)) (of class scala.Tuple2)
at forcomp.A$A183$A$A183$$anonfun$subtract2$1.apply(temp.sc:11)
at forcomp.A$A183$A$A183$$anonfun$subtract2$1.apply(temp.sc:11)
at scala.collection.LinearSeqOptimized$class.foldLeft(temp.sc:120)
at forcomp.A$A183$A$A183.subtract2(temp.sc:11)

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