Fix #1470: Fix dynamic selection in presence of inaccessible member of the sam name

Author: nicolasstucki

src/dotty/tools/dotc/typer/TypeAssigner.scala

@@ -203,8 +203,9 @@ trait TypeAssigner {
    */
   def selectionType(site: Type, name: Name, pos: Position)(implicit ctx: Context): Type = {
     val mbr = site.member(name)
-    if (reallyExists(mbr)) site.select(name, mbr)
-    else if (site.derivesFrom(defn.DynamicClass) && !Dynamic.isDynamicMethod(name)) {
+    lazy val canBeDynamicMethod = site.derivesFrom(defn.DynamicClass) && !Dynamic.isDynamicMethod(name)
+    if (reallyExists(mbr) && (mbr.accessibleFrom(site).exists || !canBeDynamicMethod)) site.select(name, mbr)
+    else if (canBeDynamicMethod) {
       TryDynamicCallType
     } else {
       if (!site.isErroneous) {

tests/pending/run/t5040.check renamed to tests/run/t5040.check

@@ -1,3 +1,4 @@
+import scala.language.dynamics // originaly used the flag -language:dynamics in t5040.flags, .flags are currently ignored
 abstract class Prova2 extends Dynamic {
   def applyDynamic(m: String)(): Unit
   private def privateMethod() = println("private method")