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tree)
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import scala.collection._
object EmptyHashMap extends mutable.HashMap[Nothing, Nothing]
object T {
val newSymbolMap: mutable.HashMap[String, mutable.HashMap[Int, Double]] = mutable.HashMap.empty
val map = newSymbolMap.getOrElse("a", mutable.HashMap.empty)
map.put(1, 0.0)
newSymbolMap.put("a", map)
/** A map storing free variables of functions and classes */
// type SymSet = Set[Symbol]
// private val free = new collection.mutable.LinkedHashMap[Symbol, SymSet]
// def freeVars(sym: Symbol): List[Symbol] = free.getOrElse(sym, Nil).toList
class Tree[X >: Null] { def tpe: X = null }
class Ident[X >: Null] extends Tree[X]
class Apply[X >: Null] extends Tree[X]
val x: Ident[Symbol] | Apply[Symbol] = ???
val y = x.tpe
val z: Symbol = y
}
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