Ada Reference Manual (Ada 2022) — Legal Information
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J.15.6 Pragma Unchecked_Union

Syntax

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

Legality Rules

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The first_subtype_local_name of a pragma Unchecked_Union shall denote an unconstrained discriminated record subtype having a variant_part.

Static Semantics

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A pragma Unchecked_Union specifies that the Unchecked_Union aspect (see B.3.3) for the type denoted by first_subtype_local_name has the value True. 
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