§A.2 Modifiers

The rule for method modifiers adds one keyword: callin:

§ A.2.1 Modifier
...
callin
Contextual constraints:
  1. The class of a method which has the callin modifier may not be declared static and must be directly contained in a team class.
  2. A method that has the callin modifier may not appear in an explicit method call (rule Apply in JLS).