- 2.a
- Reason: The preferred syntax for specifying the address of an entity is an attribute_definition_clause specifying the Address attribute. Therefore, the special-purpose at_clause syntax is now obsolete.
- 2.b
- The above equivalence implies, for example, that only one at_clause is allowed for a given entity. Similarly, it is illegal to give both an at_clause and an attribute_definition_clause specifying the Address attribute.
- Extensions to Ada 83
- 2.c
- We now allow to define the address of an entity using an attribute_definition_clause. This is because Ada 83's at_clause is so hard to remember: programmers often tend to write "for X'Address use...;".
- Wording Changes From Ada 83
- 2.d
- Ada 83's
address_clause is now called an at_clause to avoid confusion with the new term "Address clause" (that is, an attribute_definition_clause for the Address attribute).