Fix #5492: Inline accesses to private package members

Handle the case of inline accesses to private package members

Author: odersky

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

@@ -130,6 +130,8 @@ abstract class AccessProxies {
       val accessed = reference.symbol.asTerm
       var accessorClass = hostForAccessorOf(accessed: Symbol)
       if (accessorClass.exists) {
+        if accessorClass.is(Package) then
+          accessorClass = ctx.owner.topLevelClass
         val accessorName = accessorNameKind(accessed.name)
         val accessorInfo =
           accessed.info.ensureMethodic.asSeenFrom(accessorClass.thisType, accessed.owner)
@@ -159,8 +161,9 @@ object AccessProxies {
   def hostForAccessorOf(accessed: Symbol)(implicit ctx: Context): Symbol = {
     def recur(cls: Symbol): Symbol =
       if (!cls.exists) NoSymbol
-      else if (cls.derivesFrom(accessed.owner) ||
-               cls.companionModule.moduleClass == accessed.owner) cls
+      else if cls.derivesFrom(accessed.owner)
+              || cls.companionModule.moduleClass == accessed.owner
+      then cls
       else recur(cls.owner)
     recur(ctx.owner)
   }

tests/pos/i5492.scala

@@ -0,0 +1,13 @@
+package foo {
+  object A {
+    inline def f(x: Int) = B.f(x)
+  }
+
+  private[foo] object B {
+    def f(x: Int) = x * 5
+  }
+}
+
+class Test {
+  val x = foo.A.f(4)
+}