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    java.lang.NullPointerException
        at scala.tools.nsc.symtab.Types$adaptToNewRunMap$.adaptToNewRun(Types.scala:3920)
        at scala.tools.nsc.symtab.Types$adaptToNewRunMap$.adaptToNewRun(Types.scala:3921)
        at scala.tools.nsc.symtab.Types$adaptToNewRunMap$.apply(Types.scala:3984)
        at scala.tools.nsc.symtab.Symbols$Symbol.adaptToNewRun$1(Symbols.scala:822)
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