@NotNull
      @Override
      public Iterator<PsiTypeVariable> getIn(final PsiTypeVariable n) {
        final Set<PsiTypeVariable> in = ins.get(n);

        if (in == null) {
          return Collections.emptyIterator();
        }

        return in.iterator();
      }
@NotNull
      @Override
      public Iterator<PsiTypeVariable> getIn(final PsiTypeVariable n)