Merge pull request #9308 from dotty-staging/fix-#9307

Fix #9307: Handle `_` without a symbol

Author: smarter

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

@@ -149,7 +149,7 @@ class Constructors extends MiniPhase with IdentityDenotTransformer { thisPhase =
         case Ident(_) | Select(This(_), _) =>
           var sym = tree.symbol
           if (sym.is(ParamAccessor, butNot = Mutable)) sym = sym.subst(accessors, paramSyms)
-          if (sym.owner.isConstructor) ref(sym).withSpan(tree.span) else tree
+          if (sym.maybeOwner.isConstructor) ref(sym).withSpan(tree.span) else tree
         case Apply(fn, Nil) =>
           val fn1 = transform(fn)
           if ((fn1 ne fn) && fn1.symbol.is(Param) && fn1.symbol.owner.isPrimaryConstructor)

tests/pos/i9307.scala

@@ -0,0 +1,7 @@
+class Foo:
+  private var foo1: Int = _
+  private var foo2: Array[Int] = _
+  private[this] var foo3: Array[Int] = _
+  private var foo4: Array[Object] = _
+  private var foo5: Array[Array[Int]] = _
+  private var foo6: List[Int] = _