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Annotated Ada Reference Manual (Ada 2022 with Amendment 1) — Legal Information
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J.8 Mod Clauses

Syntax

1
mod_clause ::= at mod static_expression;

Static Semantics

2
A record_representation_clause of the form: 
3/3
{AI05-0092-1} for r use
    record at mod a;
        ...
    end record;
4
is equivalent to: 
5
for r'Alignment use a;
for r use
    record
        ...
    end record;
5.a
Reason: The preferred syntax for specifying the alignment of an entity is an attribute_definition_clause specifying the Alignment attribute. Therefore, the special-purpose mod_clause syntax is now obsolete.
5.b
The above equivalence implies, for example, that it is illegal to give both a mod_clause and an attribute_definition_clause specifying the Alignment attribute for the same type. 

Wording Changes from Ada 83

5.c
Ada 83's alignment_clause is now called a mod_clause to avoid confusion with the new term “Alignment clause” (that is, an attribute_definition_clause for the Alignment attribute). 
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