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

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  • What is a reason of match.error?
    via Stack Overflow by Евгений Evgeniy
    ,
    • 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 scala.collection.immutable.List.foldLeft(temp.sc:80) at forcomp.A$A183$A$A183.subtract2(temp.sc:11)
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