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Date: Tue, 30 Jan 2018 16:15:21 -0800 (PST)
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Subject: Re: Iterable container as generic parameter
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Xref: reader02.eternal-september.org comp.lang.ada:50218
Date: 2018-01-30T16:15:21-08:00
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Emmanuel gave the answer here: 
https://stackoverflow.com/questions/33496741/rules-for-formal-incomplete-types-in-ada-2012