FIx error in HashMap

Author: noti0na1

compiler/src/dotty/tools/dotc/util/EqHashMap.scala

@@ -71,7 +71,7 @@ extends GenericHashMap[Key, Value](initialCapacity, capacityMultiple):
     setKey(idx, key)
     setValue(idx, value)
 
-  override def copyFrom(oldTable: Array[AnyRef]): Unit =
+  override def copyFrom(oldTable: Array[AnyRef | Null]): Unit =
     if isDense then
       Array.copy(oldTable, 0, table, 0, oldTable.length)
     else

compiler/src/dotty/tools/dotc/util/GenericHashMap.scala

@@ -25,7 +25,6 @@ object GenericHashMap:
  *                           However, a table of size up to DenseLimit will be re-sized only
  *                           once the number of elements reaches the table's size.
  */
-// TODO: Key be anyref?
 abstract class GenericHashMap[Key, Value]
     (initialCapacity: Int, capacityMultiple: Int) extends MutableMap[Key, Value]:
   import GenericHashMap.DenseLimit

compiler/src/dotty/tools/dotc/util/HashMap.scala

@@ -72,7 +72,7 @@ extends GenericHashMap[Key, Value](initialCapacity, capacityMultiple):
     setKey(idx, key)
     setValue(idx, value)
 
-  override def copyFrom(oldTable: Array[AnyRef]): Unit =
+  override def copyFrom(oldTable: Array[AnyRef | Null]): Unit =
     if isDense then
       Array.copy(oldTable, 0, table, 0, oldTable.length)
     else