regression in result of null.## (when wrapped by a Value Class) #7396
Description
As you can see in #4311, null.## is supposed to be 0 and not an NPE. And it is, right up until extension methods get involved.
scala> null.##
res0: Int = 0
scala> (null: Predef.Ensuring[_]).##
java.lang.NullPointerException
at scala.Predef$Ensuring$.hashCode$extension(Predef.scala:236)
at scala.Predef$Ensuring.hashCode(Predef.scala:236)
at scala.runtime.ScalaRunTime$.hash(ScalaRunTime.scala:214)
at .<init>(<console>:7)
at .<clinit>(<console>)
at .<init>(<console>:7)
at .<clinit>(<console>)
at $print(<console>)