When unpickling, enter only class members into enclosing scope.

Author: odersky

compiler/src/dotty/tools/dotc/core/tasty/TreeUnpickler.scala

@@ -478,7 +478,10 @@ class TreeUnpickler(reader: TastyReader, nameAtRef: NameRef => TermName, posUnpi
               ctx.newSymbol(ctx.owner, name, flags, completer, privateWithin, coord)
         }
       sym.annotations = annots
-      ctx.enter(sym)
+      ctx.owner match {
+        case cls: ClassSymbol => cls.enter(sym)
+        case _ =>
+      }
       registerSym(start, sym)
       if (isClass) {
         localDummies(sym.asClass) = ctx.newLocalDummy(sym)