I cannot find any documentation for the version 15.1.7 but i assume that
IEnumerable is returned and therefore you first have to use
OfType<T> to get an
IEnumerable<T> (see https://stackoverflow.com/a/7757411/3936440).
So i think you need to write
bool a = bar.ItemLinks.Cast<BarItemLink>().Any(x => x.Item.Tag.Equals(tag))
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