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java.lang.OutOfMemoryError: Java heap space	at scala.collection.mutable.HashTable$class.resize(HashTable.scala:251)	at scala.collection.mutable.HashTable$class.scala$collection$mutable$HashTable$$addEntry0(HashTable.scala:154)	at scala.collection.mutable.HashTable$class.findOrAddEntry(HashTable.scala:166)	at scala.collection.mutable.LinkedHashMap.findOrAddEntry(LinkedHashMap.scala:49)	at scala.collection.mutable.LinkedHashMap.put(LinkedHashMap.scala:71)	at scala.collection.mutable.LinkedHashMap.$plus$eq(LinkedHashMap.scala:89)	at scala.collection.mutable.LinkedHashMap.$plus$eq(LinkedHashMap.scala:49)	at scala.collection.mutable.MapLike$class.update(MapLike.scala:88)	at scala.collection.mutable.AbstractMap.update(Map.scala:80)	at firrtl.passes.InferTypes$.firrtl$passes$InferTypes$$infer_types_s$1(Passes.scala:200)	at firrtl.passes.InferTypes$$anonfun$firrtl$passes$InferTypes$$infer_types_s$1$3.apply(Passes.scala:213)	at firrtl.passes.InferTypes$$anonfun$firrtl$passes$InferTypes$$infer_types_s$1$3.apply(Passes.scala:213)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)	at scala.collection.immutable.List.foreach(List.scala:381)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:245)	at scala.collection.immutable.List.map(List.scala:285)	at firrtl.Mappers$StmtMagnet$$anon$4.map(Mappers.scala:44)	at firrtl.Mappers$StmtMap.map(Mappers.scala:95)	at firrtl.passes.InferTypes$.firrtl$passes$InferTypes$$infer_types_s$1(Passes.scala:213)	at firrtl.passes.InferTypes$$anonfun$firrtl$passes$InferTypes$$infer_types_s$1$3.apply(Passes.scala:213)	at firrtl.passes.InferTypes$$anonfun$firrtl$passes$InferTypes$$infer_types_s$1$3.apply(Passes.scala:213)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)	at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)	at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)	at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)	at scala.collection.TraversableLike$class.map(TraversableLike.scala:245)	at scala.collection.AbstractTraversable.map(Traversable.scala:104)	at firrtl.Mappers$StmtMagnet$$anon$4.map(Mappers.scala:44)	at firrtl.Mappers$StmtMap.map(Mappers.scala:95)	at firrtl.passes.InferTypes$.firrtl$passes$InferTypes$$infer_types_s$1(Passes.scala:213)	at firrtl.passes.InferTypes$$anonfun$firrtl$passes$InferTypes$$infer_types_s$1$3.apply(Passes.scala:213)