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Showing content from https://timsong-cpp.github.io/cppwp/n4659/basic.lookup.elab below:

[basic.lookup.elab]

6 Basic concepts [basic] 6.4 Name lookup [basic.lookup] 6.4.4 Elaborated type specifiers [basic.lookup.elab]

If the elaborated-type-specifier has a nested-name-specifier, qualified name lookup is performed, as described in [basic.lookup.qual], but ignoring any non-type names that have been declared. If the name lookup does not find a previously declared type-name, the elaborated-type-specifier is ill-formed. [Example:

struct Node {
  struct Node* Next;              struct Data* Data;                                            };

struct Data {
  struct Node* Node;              friend struct ::Glob;           friend struct Glob;             /* ... */
};

struct Base {
  struct Data;                    struct ::Data*     thatData;    struct Base::Data* thisData;    friend class ::Data;            friend class Data;              struct Data { /* ... */ };    };

struct Data;                    struct ::Data;                  struct Base::Data;              struct Base::Datum;             struct Base::Data* pBase;       

end example]


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