+-- Extra_Accessibility_Of_Result (Node19)
+-- Present in (non-generic) Function, Operator, and Subprogram_Type
+-- entities. Normally Empty, but if expansion is active, and a function
+-- is one for which "the accessibility level of the result ... determined
+-- by the point of call" (AI05-0234) is needed, then an extra formal of
+-- subtype Natural is created (see description of field Extra_Formal),
+-- and the Extra_Accessibility_Of_Result field of the function points to
+-- the entity for this extra formal.
+