Consider the following:

package test14
class Outer {
  static class Nested {
	  String foo
	  Integer bar
  }
}

And:

package test14
class Test14 {
  void foobar() {
	  def n = new Nes|
  }
}

Invoke code assist at "|" and choose "Nested() - test14.Nested": no import declaration is added and Groovy complains that it is "unable to resolve class Nested".