Somehow fail when you're using object instead of case object

[reactormonk]

When you're using

sealed trait Foo extends EnumEntry
object Bar extends Enum[Foo] {
  val values = findValues
  object Baz extends Foo
}

You'll just get garbage as the name, without any compiler error:

@ Bar.Baz 
res3: Bar.Baz.type = $sess.cmd2$Bar$Baz$@71ac5723

[lloydmeta]

That's a good idea, and shouldn't be too hard to do either once we have the trees (here)

One thing though: sometimes people override the entryName as a val or using their own string manipulation functions; in these cases, the check probably shouldn't trigger an error even if not using case object.