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Predicate pack_archive_info/4
 pack_archive_info(+Archive, +Pack, -Info, -Strip)[private]
True when Archive archives Pack. Info is unified with the terms from pack.pl in the pack and Strip is the strip-option for archive_extract/3.

Requires library(archive), which is lazily loaded when needed.

Errors
- existence_error(pack_file, 'pack.pl') if the archive doesn't contain pack.pl
- Syntax errors if pack.pl cannot be parsed.