Consider this:

package test25
class Test25 {
	static void foo() {
		String a = 'a'
		File b = new File()
		new Object().each {
			bar(a, b)
		}
	}
	
	static void bar(String a, File b) {
		
	} 
}

The call to Test25.bar(String, File) from Test25.foo() (inside the closure) is not recognized: it's underlined and navigation with F3 or Ctrl+Click does not work correctly.