objects should override lazy values

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Title says it all. Right now you cannot override a lazy val with an object. But I think you should be able to do this, or else you will be locked in forever in lazy vals.

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Imported From: https://issues.scala-lang.org/browse/SI-5187?orig=1
Reporter: @odersky

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@paulp said:
Since we have objects overriding objects in -Xexperimental, then to complete the circuit one should also be able to override an object with a lazy val.