Refactor Tree parameterization
#16300
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Refactor `Tree` parameterization to make use of -Yexplicit-nulls.
We now have:
```scala
type Untyped = Type | Null
abstract class Tree[+T <: Untyped]
object untpd:
type Tree = Tree[Untyped]
object tpe:
type Tree = Tree[Type]
```
dwijnand
approved these changes
Nov 8, 2022
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Refactor
Treeparameterization to make use of -Yexplicit-nulls.We now have:
Fixes #16298