Fix safe-init error in Trees.scala #14931
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Fixes the following safe-init error that occurs during bootstrapping: ``` [error] -- Error: /***********/dotty/compiler/src/dotty/tools/dotc/ast/Trees.scala:815:22 [error] 815 | assert(isEmpty || tpt != genericEmptyTree[T]) [error] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ [error] |Call method ValDef.this.tpt.!=(dotty.tools.dotc.ast.Trees.genericEmptyTree[T]) on a value with an unknown initialization. Calling trace: [error] |-> @sharable val theEmptyValDef = new EmptyValDef[Type]() [ Trees.scala:970 ] [error] | ^^^^^^^^^^^^^^^^^^^^^^^ [error] |-> class EmptyValDef[T >: Untyped] extends ValDef[T]( [ Trees.scala:961 ] [error] | ^ [error] |-> case class ValDef[-T >: Untyped] private[ast] (name: TermName, tpt: Tree[T], private var preRhs: LazyTree[T @uncheckedVariance])(implicit @constructorOnly src: SourceFile) [ Trees.scala:812 ] [error] | ^ [error] |-> assert(isEmpty || tpt != genericEmptyTree[T]) [ Trees.scala:815 ] [error] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [error] |-> if !assertion then scala.runtime.Scala3RunTime.assertFailed() [ Predef.scala:10 ] ```
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Fixes the following safe-init error that occurs during bootstrapping: