Useless error message when miniboxing class

[VladUreche]

$ cat gh-bug-160.scala 
package miniboxing.tests.compile.bug160

class C[@miniboxed T] {

  private def bar() = 4

  def foo = {
    // useless error message:
    new C[String].bar()
  }
}

$ mb-scalac gh-bug-160.scala 
gh-bug-160.scala:9: error: [ occured while creating miniboxed method foo in class C_D ]
method bar in class C cannot be accessed in miniboxing.tests.compile.bug160.C[String]
    new C[String].bar()
                  ^
one error found

Well, useless because it doesn't explain the problem, otherwise there's clearly a problem there, when you start creating classes C_L, C_J and C_D that can't access the private member in class C.