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| Explicit ancestor |
The parent of the implicit signal that is defined by the predefined attributes 'DELAYED, 'QUIET, 'STABLE, or 'TRANSACTION. It is determined using the prefix of the attribute. If the prefix denotes an explicit signal or a slice or subelement (or member thereof), then that is the explicit ancestor of the implicit signal. If the prefix is one of the implicit signals defined by the predefined attributes 'DELAYED, 'QUIET, 'STABLE, or 'TRANSACTION, this rule is applied recursively. If the prefix is an implicit signal GUARD, the signal has no explicit ancestor.
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