Migrate transform

Author: noti0na1

compiler/src/dotty/tools/dotc/core/ContextOps.scala

@@ -32,7 +32,7 @@ object ContextOps:
         if (ctx.owner.isClass)
           if (ctx.outer.owner == ctx.owner) { // inner class scope; check whether we are referring to self
             if (ctx.scope.size == 1) {
-              val elem = ctx.scope.lastEntry
+              val elem = ctx.scope.lastEntry.nn
               if (elem.name == name) return elem.sym.denot // return self
             }
             val pre = ctx.owner.thisType

compiler/src/dotty/tools/dotc/core/Scopes.scala

@@ -68,7 +68,7 @@ object Scopes {
   abstract class Scope extends printing.Showable {
 
     /** The last scope-entry from which all others are reachable via `prev` */
-    private[dotc] def lastEntry: ScopeEntry
+    private[dotc] def lastEntry: ScopeEntry | Null
 
     /** The number of symbols in this scope (including inherited ones
      *  from outer scopes).
@@ -203,7 +203,7 @@ object Scopes {
 
     def this(nestingLevel: Int) = this(null, 0, nestingLevel)
 
-    private[dotc] var lastEntry: ScopeEntry = initElems
+    private[dotc] var lastEntry: ScopeEntry | Null = initElems
 
     /** The size of the scope */
     private var _size = initSize

compiler/src/dotty/tools/dotc/transform/AccessProxies.scala

@@ -2,6 +2,8 @@ package dotty.tools
 package dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import core._
 import Contexts._
 import Symbols._

compiler/src/dotty/tools/dotc/transform/ArrayApply.scala

@@ -1,6 +1,8 @@
 package dotty.tools.dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import core._
 import MegaPhase._
 import Contexts._

compiler/src/dotty/tools/dotc/transform/ArrayConstructors.scala

@@ -1,6 +1,8 @@
 package dotty.tools.dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import core._
 import MegaPhase._
 import Contexts._

compiler/src/dotty/tools/dotc/transform/BeanProperties.scala

@@ -1,6 +1,8 @@
 package dotty.tools.dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import core._
 import ast.tpd._
 import Annotations._

compiler/src/dotty/tools/dotc/transform/BetaReduce.scala

@@ -2,6 +2,8 @@ package dotty.tools
 package dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import core._
 import Flags._
 import MegaPhase._

compiler/src/dotty/tools/dotc/transform/Bridges.scala

@@ -2,6 +2,8 @@ package dotty.tools
 package dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import core._
 import Symbols._, Types._, Contexts._, Decorators._, Flags._, Scopes._, Phases._
 import DenotTransformers._

compiler/src/dotty/tools/dotc/transform/ByNameClosures.scala

@@ -1,6 +1,8 @@
 package dotty.tools.dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import core._
 import Contexts._
 import Symbols._

compiler/src/dotty/tools/dotc/transform/CapturedVars.scala

@@ -1,6 +1,8 @@
 package dotty.tools.dotc
 package transform
 
+import scala.language.{unsafeNulls => _}
+
 import MegaPhase._
 import core.DenotTransformers._
 import core.Symbols._
@@ -52,10 +54,10 @@ class CapturedVars extends MiniPhase with IdentityDenotTransformer:
       Set(refClass(defn.ObjectClass), volatileRefClass(defn.ObjectClass))
   }
 
-  private var myRefInfo: RefInfo = null
-  private def refInfo(using Context) = {
+  private var myRefInfo: RefInfo | Null = null
+  private def refInfo(using Context): RefInfo = {
     if (myRefInfo == null) myRefInfo = new RefInfo()
-    myRefInfo
+    myRefInfo.asInstanceOf[RefInfo]
   }
 
   private class CollectCaptured extends TreeTraverser {