[meta.define.static] qualify names from namespace meta #8375
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Within library wording we don't do ADL, only unqualified lookup (as per [contents] p3). This means that all the metafunctions in namespace std need to qualify names from namespace std::meta in order to find them. This also fixes the bug that name lookup in the Effects: of define_static_array would find std::extent and not perform ADL to find std::meta::extent, even if ADL was performed here.
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Within library wording we don't do ADL, only unqualified lookup (as per [contents] p3). This means that all the metafunctions in namespace std need to qualify names from namespace std::meta in order to find them.
This also fixes the bug that name lookup in the Effects: of define_static_array would find std::extent and not perform ADL to find std::meta::extent, even if ADL was performed here.