Ada Reference Manual (Ada 2022) — Legal Information
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J.15.3 Pragma Pack

Syntax

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The form of a pragma Pack, which is a representation pragma (see 13.1), is as follows:
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  pragma Pack (first_subtype_local_name);

Legality Rules

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The first_subtype_local_name of a pragma Pack shall denote a composite subtype. 

Static Semantics

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Pragma Pack specifies that the Pack aspect (see 13.2) for the type denoted by first_subtype_local_name has the value True. 
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