cplusplus / cplusplus/draft

[lib] always use sub-namespace in itemdecls

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@jensmaurer is already working on this.

Since Dec 21, 2018.

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Description

For declarations in sub-namespaces, particularly within std::ranges, our itemdecls are often very unclear about which declaration they're referring to. For example, the only clue that the advance described in [iterator.operations] is in a different namespace from the advance described in [range.iterator.operations.advance] is the subclause name and how it's cross-referenced from the synopsis. That's not good enough.

We should consistently use a ranges:: prefix on the declarator-id for entities in namespace std::ranges (and likewise for other sub-namespaces of std).

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