Consider the following:

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

And:

package test14
import test14.Outer.Nested
class Test14 {
  void foobar() {
	  def n = new Nested(|)
  }
}

Invoke code assist at "|": no suggestion is given to invoke a map-style constructor (like new Nested(foo: 'foo', bar: 5)). Neither is given if I start to type a property name (like new Nested(fo|)).